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888-2001-895 - Gates Harris History

1. Error messages that appear in the CS window can occur if you command the GUI to write an INI file that it is not possible for the CS to process correctly for some reason If you cannot figure out why the error is occurring in order to correct it you may try using the GUI to go back to a saved configuration 3 3 2 User Interface GUI While the Content Server software encodes audio and communicates with the DRM Modulator Board the Content Server GUI changes the configuration of your transmitted DRM signal This section explains how to change DRM Transmission or DRM Service options in the DRM Content Server GUI 3 10 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation v ojx M VUMeter l Timing HARRIS OAM Send F Clocktime V Show Diagnostics DRM CSB 100 Content Server Load Configuration Description Save Local AM 10 kHz weak protection high quality stereo 35 kbps Predefined Configurations Local AM 10 kHz weak protection high quality stereo 35 kbps Local AM 10 kHz strong protection good quality param stereo 22 kbps Local AM 10 kHz high noise env 16 QAM lower quality mono 15 kbps Sky wave AM 10 kHz high protection fair quality mono 17 5 kbps Standard Analog AM ossible bits in MSC 13908 1738 bytes The system always starts in the most recent configuration read from the Configuration
2. Figure 3 10 Modulator now set to AM Carrier only Mode 20 3 16 07 3 Since the DX transmitters operate at nearly constant efficiency over the modulation cycle the front panel DC Amperes is the best indication of average DRM power output For an approximate calibration of power vs amperes put the MCI in Mode 20 Carrier only Using the Low Medium and High Power Level push buttons on the transmitter record the DC current and Output Power for each level A plot of Amperes vs Power will be a nearly straight line intersecting the zero power axis at a few amperes the driver current 888 2001 895 3 41 WARNING Disconnect primary power prior to servicing Section 3 Operation hd DRM Modulator Control Interface MCI Be File Special Help Terminal Modulator ID ClockMult 1 DRM Test AmpGain 100 Ok Set ID Mode 20 Ok Initialization i 1250000 Mode 20 Carrier mode 7 ClockMult 1 Frequency 1250000 HHz Ok DACDelay 5 28 Elo DACBias 720 Amplitude Gain 100 s ClippingRatio 100 Adjustment Ok DAC Delay 5 28 usec DACDelay 5 28 i Ok DAC Bias 720 mV 1500 0 S iai p Clipping Ratio 100 lt 100 none mee e 100 B g Read All X Phase Corr OQ Check For Data amp Clear Terminal Figure 3 11 DAC Delay set based on transmitter design 4 If the amplitude channel delay for the transmitter
3. Active ethO eth0 Ethernet amp Inactive an ethl Ethernet Active profile Common 2 3 3 Before You Power Up gt NOTE Do not plug the unit in or turn it on until you have confirmed that the supply is configured for your voltage To check this you will need to open the case and remove the power cord from the back of the supply to gain access to the voltage switch Once you have the supply configured correctly be sure the power switch mounted on the supply is in the on position then reconnect the power cord and replace the cover on the case The power switch mounted on the front of the chas sis is a hot power switch and does not protect the power supply from over volt age 888 2001 895 2 17 WARNING Disconnect primary power prior to servicing Section 2 Installation 2 4 Installation DRM MOD 100 Modulator The installation section for the DRM MOD 100 Modulator contains information regarding rack unit placement component details external connections and pre power up procedures WARNING The DRM MOD100 modulator is to be used as a part of a DRM radio transmitter The DRM MOD 100 alone does not limit spurious emissions as required by EN 302 245 2 When the DRM MOD 100 is installed in a transmitter The transmitter must be provided with any filtering needed to cause the transmitter output spurious emissions to be lower than the limit of EN 302 245 2 EMF Requirements Those who are responsible f
4. If you have the VU meter enabled you will see the audio level displayed in the Content Server window You can check the audio level entering your DRM Content Server software audio encoder It is important that you do this if you are using a live audio source You will see asterisks in the Content Server output window indicating the audio level To the right of the asterisks you will see negative numbers The closer these numbers approach zero and the more asterisks precede them the closer your audio is to being clipped 3 16 07 888 2001 895 3 9 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 3 1 3 Error Messages bd Shell DRM CS amp GUI Session Edit View Bookmarks Settings Help sound server was already suspended Harris DRM CSB 100 Content Server c 2003 2004 2005 by WRMF Inc version 3 1 21 Portions SBR c Coding Technologies AAC c Fraunhoffer Institut fur Integrierte Schaltungen IIS CELP c NEC Corporation HVXC c SONY Corporation home drm drm DRM ini file changed Left 40 dB Right 40 dB home drm drm DRM ini file changed DRMENC AAC SBR true requires audio super frame gt 824 DRMENC AAC audio superframe O lt 400 which is too short for AAC Drmenc init failed Error 2 Args are audioCoding 0 coderFileld 0 coderSamplingRate 24000 audioMode 1 audio InInfo cChannels 1 1 SBRF lag 1 lengthOfAudioSuperFrame 0 lengthHigherProtected 0 Shell
5. Clear Terminal Figure 3 12 Adjusting DAC Delay and DAC Bias in Mode 0 2 3 4 5 3 16 07 Place the Modulator in Mode 0 normal DRM Mode and send data to it from the Content Server If the Content Server is unavailable use the MCI to select one of the PRBS pseudo random binary sequence test modes available in the Modulator which closely approximates the desired operat ing mode of the transmitter Adjust the DAC bias using the MCI for minimum out of band OOB noise from 10 to 25 kHz to each side of the desired output on the spectrum analyzer Start with about 100 mv steps Best results will usually be obtained with a bias 100 to 200 millivolts more negative than that used in the AM modulation test As the bias is changed the OOB noise will decrease and then start to increase again On the first iteration the minimum may be quite broad Leave this control at the minimum Adjust the DAC delay also in approximately 1 sec microsecond steps for minimum OOB noise Repeat steps 3 and 4 using smaller steps until both minima are sharp The noise at 25 kHz each side of the center frequency should be about 60 to 65 dB below the in band signal level 888 2001 895 3 43 WARNING Disconnect primary power prior to servicing Section 3 Operation 4 DRM Modulator Control Interface MCI EE File Special Help
6. 3 2 10 Shutdown To shut down the system first close any running applications on all desktops See Closing Applications above Then click on the logout icon on the task bar at the bottom of the screen Confirm and then click shut down on the login manager window Wait until the system powers down Content Server Software The first software to learn how to use is the Content Server software which sends data from the Content Server PC to the DRM Modulator Board The Content Server software encodes the audio received from the audio device 3 3 1 Multiplex Generator CS The Content Server Multiplex Generator CS is the heart of the system It is a real time software application and it starts automatically when you boot the computer It can also 888 2001 895 3 7 WARNING Disconnect primary power prior to servicing Section 3 Operation be started by clicking on the speaker icon on the task bar at the bottom of the screen Once the application has started the following windows should appear N Shell DRM CS amp GUI Session Edit View Bookmarks Settings Heln Harris DRM CSB 100 Conte E WVUMeter Ce 2003 2004 2005 by WRN F Timing HARRIS Portions 3 to AM Send SBR c Coding Technold Clocktime AAC c Fraunhoffer In B CELP c NEC ai M Show Diagnostics DRM CSB 100 Content Server HVXC c SONY Corporatid z Load Configuration Description aa Local AM 10 kHz weak protection high quality stereo
7. Load normal configuration Mode B 10 kHz 71 PL parametric stereo Predefined Configurations normal configuration Mode B 10 kHz 1 PL parametric stereo Local AM 10 kHz strong protection good quality param stereo 22 kbps Local AM 10 kHz high noise env 16 QAM lower quality mono 15 kbps Sky wave AM 10 kHz high protection fair quality mono 17 5 kbps Standard Analog AM ossible bits in MSC 9900 1237 bytes 3 3 2 3 Configurations The Save button allows you to save your configuration to other filenames as well besides just the Button1 ini through Button5 ini names The Load button allows you to load a configuration from a configuration file Remember that the configuration that is currently being broadcast on the air is DRM ini It is normally written by pressing the Send button in the GUI You can have several configuration files saved for instance to demonstrate slightly different configurations Then use Load to load the file and Send to save it as home drm drm DRM ini The Content Server will begin using the sent configuration 3 16 07 888 2001 895 3 17 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 3 2 4 Transmission v ajx M UMeter m ny H S toAM Send r Clocktime V Show Diagnostics DRM CSB 100 Content Server Configuration r service o Service 1 Service 2 Service 3 output About Robu
8. 0 Linw4a 0 JAQON WHA 0 PO Ou Boquiem esana zy 09 09 AOZZ 0 4 inva wouvinaon AlddNS YAMOd IQON s agJ1 04 1as3 4 dN Y3MOd M19 ZUYOL SYHOLVINDAY GYVOEd NO TOYLNOD GkVvOd 1V901 S d31 X9 1N0 1aS3Y NI TOHYLNO9Q LNdNI O I 13NYd LNOYS NI SNLYLS 1X3 ino JHYYdS NI ads NI ads NISALWLS 1X4 NI eds 1N0 JYYdS NI JOWLNOD 1X4 1N0 JYYdS 1 N0 SYVvdS 1N0 SLAW ALNW 44 ALOWSY SYALLINSNVYL 1NO TOYLNOS J4 HOLIMSdIG NI SOGHOLWM NI aeds TOYLNOD 1X4 OGASt OGASI 1AS34Y VNNALNV Sdd Ni Linvs IAW SOGHOLVM ILdO H3al4 Ni LINY4 YOLVINGOW Linvs IAW YSAYSS LNSLNOO ILdO Y39l4 NI 3GOW 17NY4 YOLVINGOW JAQON Stry NI IN3SJYHd IAW NI SNLYLS 4H 1X3 XO IAWN c 2 SY dy SOTVNY wana o2 _ Bso wul aya YOLVTIOSO HOLIMSdId SOd OF amanoo oa weusnipy urey opny pauepim 10 parowy oipny e007 Bi uo sieau0g pepuz j u s 0 eoureg 4 asseg 4 4 DRM MOD 10
9. GPS for future use Connects to GPS IN This is the GPS Antenna Connection for the DRM Exciter Alternate Audio This is another Audio input to the Digital Interface If the Dipswitch 3 is set to ON then in the event of a failure with the DRM Exciter or by Remote command the Dig ital interface will switch to the Alternate Audio Input Example ACC Connected to Alternate Audio Input When the ACC assembly is connected to the Alternate Audio Input on the Digital Interface the Audio DC gain will need to be adjusted on the ACC Board so when the Digital Interface is in the Bypass Mode or Alternate Mode the DC level is the same 1 With a DMM placed on TP2 on the Digital Interface record what the DC level is when in Normal Mode and the Content Server is in MODE 20 2 Select ACC mode via the Remote control input to switch the Digital Inter face to Alternate XMSN 3 Adjust R53 full CW ACC assembly must be in BYPASS mode 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 2 Installation 4 Adjust the Audio DC on the ACC assembly until the DC level is the same gt NOTE Note the DC level should be the same value when the Digital interface is in Nor mal Alternate and or Bypass modes Table 2 2 External I O Connector J7 J7 Description Input Output 1 Ext RF Carrier OUTPUT 2 Configurable outp
10. With the digital ready DX transmitter as the ideal starting point for your DRM future the Harris DRM MOD 100 Modulator is the smart choice for a flexible integrated and cost effective transition when you are ready to begin DRM broadcasts DRM MOD 100 Modulator Specifications Modulator Specifications DRM MOD 100 Modulator Product DRM MOD 100 Parameter Specification Notes Frequency Range 500KHz 1 7MHz MW AM Band Frequency Accuracy 4 PPM 1Hz Internal With GPS Phase Compensation Open Loop Table Driven From MCI Spectral Purity Per ETSI spec Per ETSI ES 201 980 v2 1 1 Number of Serial Ports 2 One Std One Fiber Optic Serial Port Date Rate 38 4Kbaud Operating Temperature 0 50 C Supply Voltage 18VDC to 110 to 240 28VDC VAC in Chassis 22 VDC Supply Current 1000mA 22 VDC Supply Current 200mA Envelope Output Voltage 10 Vpp min Envelope Output Type Differential Envelope Output 8v to Ov DC Adjust RF Output Square Wave Transmission Configurations Robustness Mode Modes A B C and D Spectrum Occupancy 4 5 kHz 5 kHz 9 kHz 10 kHz 18 kHz and 20 kHz 18 kHz All modes QAM Mode SM 16 QAM MSC 4 QAM SDC SM 64 QAM MSC 16 QAM SDC Interleaver Depth 0 4 second short interleaving 2 0 second long interleaving 18 kHz 20 kHz 4 5 kHz 5 kHz 9kHz 10 kHz Code rates Protection Levels All Standard Modulation Rates Equal Unequal Error Protection Equal Error Protection EEP Unequal Error Protectio
11. 07 1 Extensive burned and broken skin a Cover area with clean sheet or cloth Cleanest available cloth article b Do not break blisters remove tissue remove adhered particles of clothing or apply any salve or ointment c Treat victim for shock as required d Arrange transportation to a hospital as quickly as possible e If arms or legs are affected keep them elevated gt NOTE If medical help will not be available within an hour and the victim is conscious and not vomiting give him a weak solution of salt and soda 1 level teaspoonful of salt and 1 2 level teaspoonful of baking soda to each quart of water neither hot or cold Allow victim to sip slowly about 4 ounces a half of glass over a period of 15 minutes Discontinue fluid if vomiting occurs Do not give alcohol 2 Less severe burns Ist amp 2nd degree a Apply cool not ice cold compresses using the cleanest available cloth article b Do not break blisters remove tissue remove adhered particles of clothing or apply salve or ointment c Apply clean dry dressing if necessary d Treat victim for shock as required e Arrange transportation to a hospital as quickly as possible f If arms or legs are affected keep them elevated REFERENCE ILLINOIS HEART ASSOCIATION AMERICAN RED CROSS STANDARD FIRST AID AND PERSONAL SAFETY MANUAL SECOND EDITION 888 2001 895 xi WARNING Disconnect primary power prior to servicing xii 888 2001 895
12. 35 kbps Predefined Configurations Local AM 10 kHz weak protection high quality stereo 35 kbps Local AM 10 kHz strong protection good quality param stereo 22 kbps Local AM 10 kHz high noise env 16 QAM lower quality mono 15 kbps Sky wave AM 10 kHz high protection fair quality mono 17 5 kbps Standard Analog AM Possible bits in MSC 13908 1738 bytes Tir 02S The CS will read the Content Server Configuration File and a window will open displaying updated information as the Content Server runs The Configuration File is home drm drm DRM ini The appearance of your Content Server window may vary depending on your current configuration 3 3 1 1 Audio Source If you are using an external audio source such as a program audio input be sure audio is actually present 3 8 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 3 1 2 VU Meter bd Shell DRM CS amp GUI Session Edit View Bookmarks Settings Help Harris DRM CSB 100 Content Server c 2003 2004 2005 by WRMF Inc version 3 1 21 Portions SBR c Coding Technologies AAC c Fraunhoffer Institut fur Integrierte Schaltungen IIS CELP c NEC Corporation HVXC c SONY Corporation home drm drm DRM ini file changed home drm drm StreamOTextMessage txt file changed Left FRRRERRERREER RES 5 dB Right FRRRERRER AER RE 2y asi Shell
13. BACK ON A HARD SURFACE AIRWAY BREATHING IF UNCONSCIOUS IF NOT BREATHING OPEN AIRWAY BEGIN ARTIFICIAL BREATHING LIFT UP NECK PUSH FOREHEAD BACK CLEAR OUT MOUTH IF NECESSARY OBSERVE FOR BREATHING TILT HEAD PINCH NOSTRILS MAKE AIRTIGHT SEAL 4 QUICK FULL BREATHS REMEMBER MOUTH TO MOUTH RESUSCITATION MUST BE CHECK CAROTID PULSE COMMENCED AS SOON AS POSSIBLE Aor C CIRCULATION DEPRESS STERNUM 1 1 2 TO 2 INCHES eae APPROX RATE ONE RESCUER 0 F PULSE EGENT a BEGIN ARTIFICIAL 0 FIRCULATION APPROX RATE TWO RESCUERS OF COMPRESSIONS lt 5 COMPRESSIONS 60 PER MINUTE 1 BREATH NOTE DO NOT INTERRUPT RHYTHM OF COMPRESSIONS WHEN SECOND PERSON IS GIVING BREATH CALL FOR MEDICAL ASSISTANCE AS SOON AS POSSIBLE 2 IF VICTIM IS RESPONSIVE A KEEP THEM WARM KEEP THEM AS QUIET AS POSSIBLE LOOSEN THEIR CLOTHING A RECLINING POSITION IS RECOMMENDED 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing FIRST AID Personnel engaged in the installation operation maintenance or servicing of this equipment are urged to become familiar with first aid theory and practices The following information is not intended to be complete first aid procedures it is a brief and is only to be used as a reference It is the duty of all personnel using the equipment to be prepared to give adequate Emergency First Aid and there by prevent avoidable loss of life Treatment of Electrical Burns 3 16
14. File Your screens may be different depending what was programmed during test From this main screen you can select the Transmission tab 3 16 07 888 2001 895 3 11 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 12 v Confiquratio x M VWUMeter l Timing HARRIS F Clocktime oa one Show Diagnostics DRM CSB 100 Content Server Service ol Service 1 Service 2 Service 3 output About Robustness r SDC Mode 4 p Interleaver Depth A5 Guard Interval Local Medium Wave 16QAM C 4QAM io sec 0 4 sec i MSC Mode r Spectrum Occupancy B 20 Guard Interval General Sky Wave 64 OAM no hier SM A5kHz 10 kHz C C27 Guard Interval Severe Multipath 64 QAM hier on HMmix c i i C 64 QAMhier HQ HMsym gt KHz 18 kHz D 44 Guard Interval Severe Multipath Doppler C 16 QAM no hier SM C 9 kHz 20kHz Prot Level For More Protected Part A Stream Streami Stream2 Stream3 _ Total Actual m Prot Level For More Protected Part a a az az a 0 5 strong 0 0 Jo 2 0 0 ir 0 C 0 6 Maximum C071 i ae z w E eE Available rot Level For Less Protected Part B ae 46 C 0 5 strong h 1738 lo fo fo 1738 1738 C 0 6 Fill To Maximum Base Enhancement gt 0714 co C 9 Cg base layer 0 78 weak i enhancement layer gt AM DRM Modes Pure DRM C AM by External Modula
15. Freq 1250000 r Adjust Ok DAC Bias 1250 mV 1500 0 rata 1 Clipping Ratio 100 la 100 none OE D Alibi Lib Q Check For Data amp Clear Terminal Figure 3 8 Modulator set to Mode 22 AM Carrier modulated with a 750 Hz audio tone 3 16 07 888 2001 895 3 39 WARNING Disconnect primary power prior to servicing Section 3 Operation Terminal ClippingRatio 100 DACDelay 10 56 DACBias 740 ClippingRatio 100 Ok DACDelay 10 56 Ok DACBias 740 Ok ClippingRatio 100 DACDelay 10 56 DACBias 720 ClippingRatio 100 Ok DACDelay 10 56 Ok DACBias 720 Ok bg DRM Modulator Control Interface MCI BG File Special Help ClippingRatio 100 _ Modulator ID DRM Test Isan Initialization Mode 22 98 AM 750 Hz a Frequency 1250000 Amplitude Gain 100 Adjustment DAC Delay 10 56 usec A a DAC Bias 720 mV 1500 0 A a A Y Clipping Ratio 100 100 none g Read All x Phase Corr Q Check For Data Clear Terminal Figure 3 9 Adjusted the DAC Bias to approximately correct level 1 3 40 Set the mode on the MCI to mode 22 carrier with 98 AM 750 Hz Adjust the Audio Gain control for the desired AM mode power as indi cated on the transmitter Output Power meter Using an oscilloscope or modulation analyzer adjust the DAC Bias so that the negative
16. LED Description DSI Transmitter is operating in Digital Audio Mode DS2 Transmitter is operating in Normal Analog Audio Mode DS3 MDI Multiplexed Distribution Interface has failed DS4 The DRM MODULATOR has failed DS5 The Transmitter is Operating in Bypass Analog Audio Mode DS6 Data is being transmitted to the DRM Exciter via the Content Server DS7 The transmitter is muted due to the switching of mode DS8 Peak Audio Detector Timeout Fault DS9 Transmitter is operating in Alternate Audio Mode DS10 The Digital Interface is in Local Control gt NOTE For more information concerning the Digital Interface board see Technical Man ual 888 2001 893 3 56 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing HARRIS Section 4 Theory 4 1 4 2 4 3 3 16 07 Obtaining the ETSI Specification Your DRM system creates a DRM signal which is compliant with the ETSI specification ETSI is the European Telecommunication Standards Institute The DRM Exciter Board performs the actions listed in Chapters 7 8 and 9 of the ETSI spec The spec is available by searching for DRM at http pda etsi org pda queryform asp and choosing the most up to date search result It should be on the order of 184 pages You may plan to read the ETSI specification or print and display it with your DRM development system Before display or deep reading it is recommended that you first skim Sections 7 8 and 9 Figure 1 in Section 4 2
17. Server room Dedicated Ethernet 0 DI Modulator data MCT Setup MCT laptop temporary audio source for setup Figure 2 6 Studio and Transmitter at Different Locations This diagram shows a typical setup for a radio station in which the studios and transmitter are not in the same location The DJ s computer still communicates over the local LAN with the Content Server as before However the DRM Content Server s Ethernet 0 port is now used instead of the MDI serial port to send MDI data to the DRM Modulator through a leased dedicated line In either of the above configurations you may need to select an IP address for the Content Server Ethernet 1 connection on the local LAN If you decide to change the IP addresses of the Content Server Ethernet 0 and DRM Modulator Ethernet connections you will also need to be cautious about which addresses you choose The Content Server Ethernet 0 and 1 addresses can be set to fixed addresses called Static IP addresses or set to automatically configured addresses called Dynamic IP addresses obtained through the DHCP protocol gt NOTE It is recommended that you use static IP addresses for all of the addresses in your DRM system These are the reasons The DRM Modulator can only be set to a static IP address The DRM Content Server Ethernet 0 connection should be set to an IP address and Subnet mask that allow it to connect to the DRM Modulator If you con
18. a p Audio S OUNCE ee tite hn Aa EEA 3 8 PAP Oi oe ph col O 22 VU MOCO Ps re A AA EGI 3 9 Auxa Dives 2 3 Error Messages 0 000 c ce eee eee 3 10 Sori Carb cca P 2 3 User Interface GUD o an onaananaa anaana 3 10 Rpa p A dug e a e ara e 3 3 Interface with CS via Send Command 3 13 i hes POA TE STR R e edi is eters ri 3 Preset Button o a onanan anana 3 14 reentry E E Oa te a Making the Necessary External Connections 2 4 Sees OO ee ee E AUO SOE E EAEL TNE VEEE EN ea 2 4 Mrans misgion le ee Oe gE Eg Fbeekt oN Fe es Serial Ethernet Connections 2 4 ea anes hih SA ee e Basic Local Connections 6 2 5 Services ee Skee eee or 3 25 Ethernet Connections 0005 2 6 Audio anete E A 3 97 GUI Ethernet Setip c 0ds003062 008 anes 2 13 ne es a Cen Ok here SMG ige 3 98 Before You Power Up 00000 e eens 2 17 i ig OE Sie komt SN Rote LY qe Installation DRM ea 100 Modulator 7 18 CS Diagnostic and Status Output Options 3 29 PAF g yagi apne a ge a i O tp t es uir he bien gv eee Oak eae a ia 3 31 ae PA AAT EE Be RS N 5 gt Text Messages ahe naa we E ate den 3 33 Anes aces OE GE peg ae a 19 Modulator Control Interface MCI Software 3 35 Digital Interface AE S EE A SA E Y 2 19 Turn On the Modulator Chassis 3 37 Digital Interface External Connections 2 20 Transmitter Optimization A TAE 3 38 Content Server CS 0ccccccseeeeeees 2 21 P
19. applying the IPM correction close this window by selecting Close and repeat steps 3 and 4 as required 3 46 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 7 Network Settings The DRM Modulator is always setup via serial port from the MCI program Its Special menu contains an entry that allows you to set the Ethernet IP address port number and MAC address for the DRM Modulator These settings affect what IP address the DRM Modulator occupies on the Ethernet network If you change these settings make sure you also change the Content Server GUI Output tab to send to the new Ethernet address and port number if you do not use the Ethernet port on your DRM Modulator ignore these settings DRM Modulator Control Interface MCI zol x Modulator ID Q cet 1D y Set ID Initialization E Load Firmware Mode 00 normal DRM mode ind z save Parameters Frequency 1000000 flH Clock Mult 1 QB Initialize Amplitude Gain 100 oy Adjustment DAC Delay 0 00 BI usec Adjust DAC Bias fo kl mv 1500 0 Clipping Ratio a0 100 none C Read All phase cor simulcast go GPS Status Network Settings E Check For Data Y Clear Terminal Modulator Network Settings zo IP Address it UDP Port 10000 MAC Address 00 E 0 68 54 71 96 Read all eal Apply all X Close 3 16 07 888 2001 895 3
20. assumes a video monitor with 1280 x 968 resolution If this is not the case the display may indicate in error during boot up Hit Ctl Alt to switch resolutions 888 2001 895 3 1 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 2 General Linux operation The DRM CSB 100 utilizes a customized version of the CentOS Linux operating system There are certain basic operating procedures you should know when using this system but which will not normally require adjustment 3 2 1 Autostart The DRM CSB 100 Content Server will boot automatically without user intervention into a user account called drm The Content Server multiplex generator and graphical user interface applications will also start automatically Do not attempt to interrupt this process 3 2 2 Task Bar Once the system is up and running normally you will observe a task bar at the bottom of the screen which has this appearance eS nT ead a g Ags M A e 3 2 The elements in that bar are a series of application icons 4 alternate desktop buttons any operating applications and the date and time Applications are started by a single click on the appropriate icon The name of the application appears when the mouse is moved over the respective icon 3 2 3 Multiple Desktops The multiple desktops allow you to open different applications on different desktops and to switch easily from one to the other This reduces the clutter of too many
21. be sure this key has not come loose A CAUTION DO NOT REMOVE THE SOFTWARE KEY FROM YOUR COMPUTER IT IS A VERIFICATION OF OWNERSHIP OF THE INDICATED SOFWARE LICENSE THE SOFTWARE WILL NOT OPERATE WITHOUT THIS KEY IF YOU LOSE THIS KEY YOU WILL BE CHARGED FULL PRICE FOR REPLACEMENT SOFTWARE 2 3 1 8 Monitor For best results use a monitor with 1280 x 1024 resolution Resolution of 1024 x 768 will work but limit usability of the graphical interface Connect the monitor to the standard VGA connector on the back panel of the DRM CSB 100 2 3 1 9 Keyboard and Mouse Connect user supplied keyboard and mouse to the corresponding standardized connectors on the back panel of the DRM CSB 100 888 2001 895 2 3 WARNING Disconnect primary power prior to servicing Section 2 Installation 2 3 2 2 3 2 1 Audio Source Making the Necessary External Connections The RME HSDP 9632 is a high flexible professional grade sound card that can be configured for various formats of either analog or digital input depending on the user s preference and available feed Table 2 1 outlines the various options and connection methods Table 2 1 Audio Connection Method Break Out Cable Type of Audio Feed Requirement Method of Connection Configuration Settings Sample 48 0 kHz Mixer Settings Input Level 10 dBV ADAT ontical Optical cable TOSLINK to upper most AEB unchecked default no sliders up on p optical con
22. demonstration purposes play recorded wav files through the system To do this you will first need to close the active two Content Server windows running on virtual desktop 1 Note this will interrupt you DRM signal and cause the DRM MOD 100 to switch into analog mode Next insert the appropriate CD in the player accessed from the system front panel After a moment a browser window of the files on the disk will appear Now drag the audio file you desire to play onto the Content Server CS icon located on the task bar The Content Server application will start operating with this wav file as the audio source The file will repeat continuously until the Content Server is closed To remove the CD open a terminal window using the terminal icon on the task bar and type eject and Enter then close the terminal window by typing exit and Enter gt NOTE Audio files played from a CD in this manner must be wav files recorded with a sampling rate of 48 000 and 16 bit resolution 3 2 7 Audio Configuration As described in the audio source section under installation the RME HSDP 9632 is a high flexible professional grade sound card that can be configured for various formats of either analog or digital input depending on the user s preference and available feed The system default configuration is for Analog balanced input If that describes your audio feed for the DRM system you do not need to make any other adjustments and can ignore t
23. design is known set the MCI DAC Delay to this value All MCI changes become effective only when the associated Adjust button is selected for settings in the Adjust ment area of the MCI or the Initialize button for settings in the Ini tialization area of the MCI 3 6 2 Optimization 1 Connect a Spectrum Analyzer and Modulation Analyzer to the RF Sample output of the transmitter as specified in the DRM System Manual The Spectrum Analyzer should be set for 100 Hz resolution Be careful to con nect the test equipment through the specified attenuators to avoid overload and possible damage to its input circuits The RF Sample output level is about a watt of RF 888 2001 895 WARNING Disconnect primary power prior to servicing 3 42 3 16 07 4 DRM Modulator Control Interface MCI File Special Terminal ClippingRatio 100 DACDelay 5 28 DACBias 710 ClippingRatio 100 Ok DACDelay 5 28 lOk DACBias 710 Frequency 1250000 iHz Ok DACDelay 5 28 N Eik DACBias 720 Amplitude Gain 100 lt 1 ClippingRatio 100 Adjustment Ok DAC Delay 5 28 usec DACDelay 5 28 Ok DAC Bias 720 lt mV 1500 0 oo a p Clipping Ratio 100 al 100 none ee Li E Read All X Phase Com Help Section 3 Operation Modulator ID DRM Test Psa Initialization Mode 00 normal DRM mode v A Q Check For Data
24. diagram 2 4 2 2 Digital Interface The purpose of the Digital Interface is to Monitor the DRM Exciter and in the event of a Failure switch to the Local Audio Input and command the Transmitter to switch to the Internal Crystal Exciter to maintain RF Operation 888 2001 895 2 19 WARNING Disconnect primary power prior to servicing Section 2 Installation 2 20 The Digital Interface can have DRM ACC amp NORMAL AM Modulation schemes for a single transmitter The Digital Interface takes a Normal Audio Input and adds a DC level to the Audio to match the DRM signal The transmitter only needs to be set up for DC coupled and widening of the Bessel Filter to accommodate the DRM Signal The Local audio Input and the Alternate Audio input have the ability to be DC coupled in case you have the ACC option for the transmitter The Digital Interface monitors the status lines of the DRM Exciter In the event of a failure of the DRM Exciter the Digital interface will switch to the Local Audio Input to maintain RF Operation of the transmitter 2 4 2 2 1 Digital Interface External Connections RF OUT Connect to RF Out On the rear panel this is the Phase Modulated RF signal that drives the Transmitter RF FWD for future use Connects to RF FWD This is used as a RF Fwd sample to drive a feedback circuit RF REF for future use Connects to RF Ref This is the Feedback sample used to adapt the DRM Signal Automatically
25. in the different modes 888 2001 895 2 25 WARNING Disconnect primary power prior to servicing Section 2 Installation 2 26 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing HARRIS Section 3 Operation 3 1 3 16 07 DRM CSB 100 operation This section contians normal day to day power on and operational procedures and information for the Harris DRM system The DRM CSB 100 Content Server and DRM MOD 100 Modulator work as a unit The section focuses on the DRM CSB 100 Content Server and its software which is the most complex portion of the system Operation of the DRM MOD 100 Modulator is detailed in section 3 5 3 1 1 Powering Up Normal power on requires simply depressing and releasing the front panel power switch located in the center of the panel next to the floppy drive gt NOTE Do not plug the unit in or power it up until you have confirmed that the supply is configured for your voltage To check this you will need to open the case and remove the power cord from the back of the supply to gain access to the voltage switch Once you have the supply configured correctly be sure the power switch mounted on the supply is in the on position then reconnect the power cord and replace the cover on the case The power switch mounted on the front of the chas sis is a hot power switch and does not protect the power supply from over volt age 3 1 2 Adjusting Display The DRM CSB 100
26. open windows on one screen as well as the need to minimize one window to see another The two Content Server windows Mutliplex Generator and GUI will open automatically on desktop number one The others may be used for displaying the MCI editing text messages or configuring the audio input 3 2 4 Lock Terminal One of the application icons in the task bar at the bottom of the screen is a padlock for locking the session Clicking this icon will not interfere with the operation of the Content Server but it will blank the screen and disable the keyboard and mouse Then when someone attempts to use the system will it will prompt for the drm account user 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Section 3 Operation password This password is harrisdrm Be sure only authorized personnel know this password to unlock the terminal 3 2 5 Closing Applications Because of the realtime nature of the applications on the Content Server and to protect from accidental interruption the close button has been hidden from its normal location in the upper right corner of an application window In order to close an application you must right click on the title bar of the window and select Close You can also close the currently active window by typing ALT F4 3 2 6 Accessing DVD CD player Normally the Content Server will operate with audio fed through the audio card from an external source You may for
27. output to the oscilloscope The oscilloscope sweep should be syn chronized to the demodulated AM or the Amplitude output of the Modula tor The Analog Input circuit board of the transmitter also has audio testpoints which can be used as sync signals If the RF signal on negative peaks is too small the Modulation Analyzer will lose its lock on the carrier and give an unstable display Slightly more positive bias will usually correct this The objective of this adjustment is to make the output phase as constant as possible over the amplitude range covered by the AM modulated signal Curve Size C Directional Drag Figure 3 14 IPM correction window showing generic DX series curve 8 The default compensation in the Modulator may have been set during test ing by saving parameters to the flash If you have recently updated your firmware the firmware version will contain some version specific default compensation values It can be read by selecting the Read All button in this window You can start with this curve or set all compensation to zero with the Reset button and then vary the compensation using the mouse or touchpad of the MCI computer A generic DX series curve is 80 80 70 888 2001 895 3 45 WARNING Disconnect primary power prior to servicing Section 3 Operation 60 50 30 20 15 10 5 0 0 0 251 251 246 246 241 241 236 236 236 236 241 241 and 236 Changes become effective only when the A
28. peaks are at approximately 98 modulation just above the clipping level While making this adjustment it will probably be necessary to re adjust the Audio Gain control to maintain the desired carrier power This sets the DAC Bias to approximately the correct level for DRM operation and the peak power in DRM mode will now correspond to approximately 125 positive peak modulation the designed peak output of the transmitter The Output Power meter on the DX and most other transmitters indi cates average carrier RF output voltage converted to power in kilowatts It therefore measures the carrier power in normal AM transmission and deliberately ignores the sideband power It does not give a useful indication of average power in DRM mode 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation 4 DRM Modulator Control Interface MCI Be File Special Help Terminal Modulator ID Mode 22 DRM Test Ok S Freq 1250000 Set ID Ok ClockMult 1 Initialization Ok Mode 20 Carrier mode v AmpGain 100 Mode 20 Frequency 1250000 Hz Freq 1250000 lala Amplitude Gain 100 H Mode 20 Adjustment Ok DAC Delay 10 56 usec Freq 1250000 Adjust Ok DAC Bias 1250 m mV 1500 0 aaa 1 Clipping Ratio 100 2 100 none mAT ki Eeen Q Check For Data amp Clear Terminal
29. prior to servicing Section 1 Introduction 1 5 Specifications See Harris DRM brochure at rear of this manual 3 16 07 888 2001 895 1 3 WARNING Disconnect primary power prior to servicing Section 1 Introduction 1 4 888 2001 895 WARNING Disconnect primary power prior to servicing 3 16 07 HARRIS Section 2 Installation 2 1 2 2 2 3 3 16 07 Introduction This section details the procedures to receive install and prepare the DRM system for use Installation DRM CSB 100 Content Server The installation section for the DRM CSB 100 Content Server contains information regarding rack unit placement component details external connections and pre power up procedures Placement The DRM CSB 100 consists of a single 3RU chassis that should be installed in a rack adjacent to the transmitter together with the DRM MOD 100 Future Ethernet MDI interface functionality will permit installation in another location closer to the original audio source Consideration must also be given to a place for the monitor keyboard and mouse required by the system Standard 110 220 volt power is required preferably through a customer supplied UPS 2 3 1 System Components Following is a brief description of the DRM CSB 100 system hardware components The base computer system is a 3RU rack chassis which has been factory assembled and configured and does not require user modification except to set the correct input v
30. servicing 3 16 07 Section 3 Operation Protection Level Prot Level For More Protected Part A 0 5 strong 0 6 0 74 0 78 weak Prot Level For Less Protected Part B 0 5 strong 0 6 0 74 0 78 weak The final setting is that of your forward error correction level for each part The specific meanings of these numbers are listed in Section 7 3 2 and Section 7 5 1 in the ETSI DRM Specification To summarize briefly DRM transmits three types of data Fast Access Channel or FAC data is spread through every symbol of every frame of every superframe It contains only about 65 bytes but specifies information that is critical to the decoding of the rest of the signal For example it specifies the QAM scheme that the receiver should use to decode the other two types of data It uses the very robust 4 QAM mode and a low 0 6 code rate and is protected by an 8 bit CRC The meaning of each bit of this data is described in ETSI DRM Specification Section 6 3 The second type of data is the Service Description Channel or SDC This channel indicates which overall code rates should be used to decode the bits received from the QAM de mapping In the future you will also be able to send broadcast schedules and alternate frequency information via this channel This capability has not yet been included in the Content Server The final type of data is the Main Service Channel or MSC This channel contains the audio and data services and
31. streams Your DRM System will work with only one stream The capability to allow up to 4 streams is still under development The bit capacity of the Main Service Channel is affected by the code rates A lower code rate fewer info bits and more check bits gives better error correction but reduces the available bit rate of the MSC channel In different QAM configurations different overall code rates will be available For example in 16 QAM SM the choices are 0 5 and 0 62 Your options in 64 QAM SM are overall code rates of 0 5 0 6 0 71 or 0 78 for each part Of these 0 5 provides the greatest protection and 0 78 the least Your DRM signal sound best at 0 78 but will not provide enough error protection for your signal to be decodable as far away as if you use a lower code rate Base Enhancement Layer Base Enhancement base layer enhancement layer 888 2001 895 3 23 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 24 Leave this setting set to Base Layer The Enhancement Layer is flag for DRM signals that is not used yet 3 3 2 4 2 DRM AM switching AM DRM Modes Pure DRM AM by External Modulation AM Synthesized in DRM Exciter Simulcast DRM Above AM Simulcast DRM Below AM Simulcast DRMs Above amp Below AM Simulcast One DRM Split Around AM The DRM system is designed to be able to switch into analog mode Currently the DRM Modulator will do this automatically if it detects a problem
32. which may only be partially reflecting The layers are not the smooth surfaces drawn in textbooks they may be patchy and even tilted particularly at sunrise and sunset Energy from the transmitter frequently reaches the receiver via several paths with different reflection points In MF broadcasting at night severe multipath may occur at the fringes of the daytime groundwave coverage area when a skywave ionospheric signal also arrives at the receiver with comparable strength having traveled some 200 km more than the groundwave signal Since radio signals travel at 300 km ms the time difference between the signals is about 0 65 ms At some frequencies the two signals add at others they subtract and cancel The spacing between cancellation frequencies is the reciprocal of the time delay or 1500 Hz in this example The delay varies over time with the result that the nulls sweep across the channel In AM a particularly obnoxious audio distortion occurs when a multipath null cancels or reduces the carrier leaving the receiver unable to demodulate the sidebands In the case of digitally modulated signals this causes extreme phase and amplitude distortion which makes demodulation impossible In the 1980s the long distance telephone companies shifted from analog to digital terrestrial microwave systems They found that the digital systems were very resistant to flat non frequency selective fading due to rainfall attenuation but they were surpri
33. 0 Operation Section 4 Theory LINX AOVAYALNI IWLIDIC a ae 5 Oldnv SOTWNY Apae waa YOLVINGOW WYA 19W orany r 29v olpny NIY9 OlaNY a31aN09 ov 1uawsnfpy urea oipny p 1o14 jessog NIY9 Od Olan apnyjubeyy 3 16 07 icing to serv imary power prior 888 2001 895 t pr isconnec D Figure 4 1 Digital Interface Block Diagram WARNING uoIsi Au0D papug aj6ulg 0 eourjeg oipny 12907 4 6 3 16 07 Section 4 Theory 4 4 1 DRMINTLK The Digital Interface detects that a DRM Exciter is connected by the Intlk signal The Digital interface sends a low signal out via Q18 R186 to the DRM Exciter and it has a loop thru signal and passes it back to TP42 When TP42 is LOW then a DRM exciter is connected to the system 4 4 2 DRM RST The RST line at this time is not used in the Digital Interface Logic 4 4 3 DRM WDOG The WDOG Watch Dog circuit when in operation is a 400ms pulse signal The Digital interface has an internal timer that counts from 0 to 4 seconds The WDOG input resets this timer If the timer reaches 4 seconds then the digital interface will make a switch to a different Audio Source to the Transmitter 4 4 4 DRMMDI_F This signal will go low when there is no communication between the DRM Exciter and the Content Server IF this signal goes Low the digital inte
34. 1 In9 amp 10 SPDIF amp AES EBU In 11 amp 12 Analog Under the input channel label is a button which selects the output associated with that input The Content Server always uses the audio from output A 1 2 Therefore whichever input you are using must be mixed into A1 2 That is what is described in the mixer settings column in Table 3 1 For example to set the mixer for use of the AES EBU input follow these steps a Click on the button under In 9 b Select A1 2 c Click and drag the slider on In 9 all the way up 3 6 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 3 3 16 07 Section 3 Operation d Click on the button under In 10 e Select Al 2 f Click and drag the slider on In 10 all the way up You follow a similar process for SPDIF or analog inputs 3 2 8 LAN Connection To configure the LAN connection on the DRM system for your network select an available desktop and start a terminal window by clicking on the terminal icon on the task bar at the bottom of the screen In the terminal window execute the following command sudo system config network 3 2 9 Time Synchronization To configure the date and time and the Network Time Protocol NTP on the DRM system select an available desktop and start a terminal window by clicking on the terminal icon on the task bar at the bottom of the screen In the terminal window execute the following command sudo system config date
35. 1 2 slider up A2 ou slider up The default configuration is for Analog balanced input If that needs to be changed the appropriate configuration and mixer setting are set through the CS Audio Configuration tool which can be run by double clicking it s icon on the desktop once the system is up and running 2 3 2 2 Serial Ethernet Connections Starting with DRM Modulator firmware 1 02 Ethernet capability is included in your DRM Modulator s firmware This section details the information needed to effectively 2 4 888 2001 895 WARNING Disconnect primary power prior to servicing 3 16 07 3 16 07 Section 2 Installation connect and configure the Ethernet settings of your DRM system It also describes the GPS capabilities of the system gt NOTE The DRM Modulator operates in Analog AM mode whenever the Content Server is disconnected or the system is switched to Bypass via the front panel rocker switch In order to be able to broadcast Analog AM analog audio for instance from a conventional AM studio to transmitter link must be connected to the Alternate Audio input XLR connector not shown on the back of the DRM Mod ulator 2 3 2 2 1 Basic Local Connections The simplest way to connect the components of your DRM system is to locate your DRM Content Server and DRM Modulator in the same rack at the transmitter site This is the configuration that has been used most in the past for Harris DRM C
36. 102 You might change this static address if you place the DRM Modulator and Content Server CS on a switch with other LAN traffic If you were to choose static IP addresses for the Modulator and CS that are more similar for example 192 168 0 100 and 192 168 0 200 you would be able to use a subnet mask of 255 255 255 0 If you do not understand subnet masks and IP addresses it would be best for you not to change these values If you edit the eth1 connection you might see something like this 888 2001 895 2 15 WARNING Disconnect primary power prior to servicing Section 2 Installation Vv Ethernet Device JE General Route Hardware Device Nickname C Allow all users to enable and disable the device C Enable IPv6 configuration for this interface Automatically obtain IP address settings with DHCP Settings Hostname optional Automatically obtain DNS information from provider Statically set IP addresses Manual IP Address Settings Address Subnet mask Default gateway address 2 OK 3 Cancel Notice that it is not automatically turned on when the system is turned on Activate device when computer starts is unchecked This is the usual way to disable an Ethernet connection If it were enabled manually or were changed to be enabled every time the computer is turned on using the configuration above it would attempt to get an IP address automaticall
37. 3 16 07 WARNING Disconnect primary power prior to servicing Table of Contents Section 1 Introduction Adjusting Display 2 0 0 2 0000000 e eee 3 1 tents T General Linux operation sssusa sesanan 3 2 MUPOCUCTION 20 fit LA Ase tear acaia iv at Lae kea Seon Be BES Bg th sad ne Mtb aetna ASRS RAN PE ened Eve Autostart nene eane a eth subi E a Aa aladt en Dee General Description o assso8dasreso rie renr 1 1 Task Bain ti doch a tote a a ae es ad te 3 2 IRCAUUIEES 2s Mee o i a ae e a a a A 1 1 Multiple Desktops A A A n a Rs E S 3 2 Block Diagram 0 0 0 eee eee 1 2 Lock Terminal 0 0 0 ccc cece eee 3 2 Specifications sensns ate neeay p a RO G 1 3 Closing Applications 0 0004 3 3 Accessing DVD CD player 4 3 3 i Audio Configuration 00 0 nre 3 3 Section 2 Installation Audio Configuration Settings 3 4 mesdasien 2 1 Audio Mixer Settings 005 3 5 Installation DRM CSB 100 Content Server 2 1 EAN onneen RAEE O a ee q Pi gt i Time Synchronization 0 0005 3 7 ACEIMEMN Es tees eet as E Mean ae ae LEL what he etter ge a ame SHUAOWN acer oes Seales ow Kereta eae ede nee 377 System Components 0 020020 eee eee 2 1 C 22 Content Server Software 0 nanunua 3 7 Si a i pense P A ERS name TE 3 Multiplex Generator CS 0000000 3 7 E Gas ed ee ete a n me enter ghee
38. 4 and Section 6 4 3 13 contain more information on language and country of origin specification Tl CA System Used 5 The CA System Used check box indicates whether conditional access is enabled for this service Leave this box unchecked The DRM system allows up to 256 different 3 26 888 2001 895 WARNING Disconnect primary power prior to servicing 3 16 07 3 16 07 Section 3 Operation conditional access systems Conditional access is designed to restrict decoding of your signal to specially enabled receivers Your DRM System does not currently support Conditional Access For more information on conditional access read Section 6 3 4 and Section 6 4 3 3 of the DRM Specification l 0 Enhancement Flag 6 The Enhancement Flag check box should be left unchecked If an enhancement layer is ever added to the basic DRM specification this check box will be turned on for the content servers which broadcast using the enhancement layer The full capabilities of their transmissions would only be decodable by receivers which also support the enhancement layer For more information see DRM Specification Section 6 3 3 50 Audio Data Audio Data Unused 7 The Audio Data group of radio buttons lets the user specify whether to the service transmits audio or data or is unused The DRM Content Server only allows you to broadcast Audio or PRBS specified as Audio Services 1 2 and 3 are not used and should be specified as Unused in the
39. 47 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 48 If you know what you are doing you can change the IP address and UDP port of your DRM Modulator You might do this if you are integrating your DRM system into a local network or want to configure it to work with an existing router or routers Harris DRM Modulators are shipped with the IP addressing scheme 10 2 3 x where x is the serial number of your DRM Modulator board For example 10 2 3 103 is the IP address of the DRM Modulator board having serial number 103 The port number referred to here is the UDP port number that the DRM Modulator will listen on for MDI packets Valid port numbers are 0 through 65535 It is advisable to use a high port number for example somewhere in the range from 2000 two thousand to 30000 thirty thousand The default port for Harris DRM equipment is 10000 ten thousand Do not change the MAC address unless you have a good reason to do so When changing the MAC address be sure that you do not conflict with the MAC address of any other device on your network or that could ever be connected to your network This is why you should not change the MAC address you do not know what may be connected to your network in the future Manufacturers are required to ship equipment with unique MAC addresses The following MAC addresses are invalid 00 00 00 00 00 00 and ff ff ff ff ff ff Many people familiar with networ
40. Connect a computer with the MCI software and make the adjustments with the software to achieve the best Quality DRM Signal 2 4 3 Pre power Up Procedures 2 4 3 1 Setting power supply voltage The power supply is capable of operating from 100 120 VAC or 200 240 VAC Operating voltage is set automatically and does not require user intervention 2 4 3 2 Default frequency setting You should set the primary broadcast frequency of you transmitter on the DRM MOD 100 exciter card You do this by setting a set of four rotary switches located at the rear of the board close to the rear panel of the unit just below the RF output connector 2 4 3 3 Interface dipswitch jumper and pot settings The following tables describe the settings that can be made for the Digital Interface 2 22 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 2 Installation Table 2 3 Dipswitch Settings Dipswitch Name Action when ON 251 0 0 5 Seconds 0 1 20 Seconds 1 0 40 Seconds 1 1 60 Seconds 3 ALT_AUDIO_EN In case of a DRM Failure the Digital interface will switch to the Alternate Audio Input ie ACC IBOC 4 FIXED_MODE Select to ON when setting up the DRM Modulator or if you never want it to switch to Local AUDIO 5 EXT_RF_ALT_MODE_EN Ext_RF Control will be Enabled when in Alternate Mode Example Select this for IBOC Operation 6 UNUSED 7 IBOC_EN Select t
41. DRM Modulator at 400ms millisecond intervals which is every 4 10ths of a second Technically during normal live operation your DRM Content Server uses the professional audio card clock to determine the timing it uses between successive outputs of DRM MDI data Your DRM Content Server may have a Word Clock module add on to the RME professional grade audio card This Word Clock input should be used to synchronize the audio card sampling clock to other digital devices in the audio system such as a digital console or other AES EBU sound sources In the case that you also purchased the Content Server GPS option the Content Server Word Clock module and all other digital audio devices that feed it should be synchronized to the master 48 kHz signal generated by the GPS Receiver This is independent of the NTP master time received over Ethernet by the Content Server Word Clock interconnections are made via coaxial cable from the respective BNC connectors on the various devices Using this word clock your DRM Content Server will not easily fall behind or get ahead of the DRM Modulator s consumption of MDI packets provided that both systems are locked to GPS timing Please refer to the RME Word Clock module and GPS Receiver documentation for further details on this topic With either system not locked to GPS time the DRM Modulator could operate too fast or too slow in consuming data from the DRM Content Server EXAMPLE If it were to operate too fas
42. DRM frame will be used for each part Part A is the higher protected part HPP and is not always present Part B is the lower protected part LPP For broadcasts where distant reception is limited by weak signals there will be fewer noticeable defects in the received audio if the signal is divided into a higher protected part and the lower protected part Steam Streami Stream2 Stream3 Total Actual Maximum Available 1620 lo 0 0 1620 1620 Fill To Maximum Base Enhancement T j 2 3 non base layer enhancement layer Figure 3 1 Using a small amount of UEP Some tests have shown that using a small amount of UEP can benefit your DRM signal coverage area You can experiment with the balance between the parts to find the optimum settings for different broadcast situations To add a small amount of UEP click the up arrow to the right of the spinner control for the number of bytes in Part A for Stream 0 Fill To Maximum O iy 2 e non Figure 3 2 Fill To Maximum option The Fill To Maximum selection allows the user to specify that one stream fill all remaining undesignated space in the DRM pipe Leave this set to 0 so the entire bit rate that can be obtained from your DRM signal is used for Stream 0 If none is selected the Content Server will allow you to leave some of your DRM signal completely unused This unused space is wasted 888 2001 895 3 16 07 WARNING Disconnect primary power prior to
43. GHd4S TA SS4400 MO PULGIU Buy Wo pUs4ayIP H Ql dlHS NOILYAYOANT ONIddlHs SAWN LNAWNInOS penbe 4 AONAINOIY4 NOLYA HOJNI SNITS Q6O 1ZZ 4IZ XYd SIXYYH o OOZ8 ZZE LZ NOHd SIHHYH WAO THO SLAV d soez 1 onno oszt x29 O d USISIAI SUBAJSAS Spappeug OGHLIW LNSAWAYd Qaa4d4 444d MAgANNN AWS ASSWNN ANGHdAATAL SS4d0d SAWYN ASWOLSND A WARNING THE CURRENTS AND VOLTAGES IN THIS EQUIPMENT ARE DANGEROUS PERSONNEL MUST AT ALL TIMES OBSERVE SAFETY WARNINGS INSTRUC TIONS AND REGULATIONS This manual is intended as a general guide for trained and qualified personnel who are aware of the dangers inherent in handling potentially hazardous electrical electronic circuits It is not intended to contain a complete statement of all safety precautions which should be observed by personnel in using this or other electronic equipment The installation operation maintenance and service of this equipment involves risks both to personnel and equipment and must be performed only by qualified personnel exercising due care HARRIS CORPORATION shall not be responsible for injury or damage resulting from improper procedures or from the use of improperly trained or inexperienced personnel performing such tasks During installation and operation of this equipment local building codes and fire protection standa
44. ING Disconnect primary power prior to servicing MRH 2 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing essential requirements and other relevant provisions of Directive 1999 5 EC Finnish HARRIS Broadcast Communications vakuuttaa taten etta DRM MOD 100 Transmitter Modulator tyyppinen laite on direktiivin English Hereby HARRIS Broadcast Communications declares that this DRM MOD 100 Transmitter Modulator is in compliance with the 1999 5 EY oleellisten vaatimusten ja sit koskevien direktiivin muiden ehtojen mukainen Dutch Hierbij verklaart HARRIS Broadcast Communications dat het toestel DRM MOD 100 Transmitter Modulator in overeenstemming is met de essenti le eisen en de andere relevante bepalingen van richtlijn 1999 5 EG Bij deze verklaart HARRIS Broadcast Communications dat deze DRM MOD 100 Transmitter Modulator voldoet aan de essenti le eisen en aan de overige relevante bepalingen van Richtlijn 1999 5 EC French Par la pr sente HARRIS Broadcast Communications d clare que l appareil DRM MOD 100 Transmitter Modulator est conforme aux exigences essentielles et aux autres dispositions pertinentes de la directive 1999 5 CE Par la pr sente HARRIS Broadcast Communications d clare que ce DRM MOD 100 Transmitter Modulator est conforme aux exigences essentielles et aux autres dispositions de la directive 1999 5 CE qui lui sont applicables Swedish Harmed intygar HARRIS Broadcast Communications att denna DR
45. ING Disconnect primary power prior to servicing Section 3 Operation EEE where x is the serial number of the system The DRM Modulator would be config ured to 10 2 3 x where x is again the serial number For example for serial number 103 the DRM Content Server is at address 10 2 2 103 and the DRM Modulator is at IP address 10 2 3 103 The DRM Content Server uses a Subnet Mask of 255 255 0 0 Disconnect the DRM Content Server MDI serial connection to the DRM Modulator Set the DRM Content Server GUI to output MDI data via the Ethernet The IP address you select here should be the IP address of the DRM Modulator The default value is 10 2 3 x where x is the serial number For example for serial number 103 the default value is 10 2 3 103 The UDP port number should be the same port number as you set in the MCI for the DRM Modulator to listen on The default UDP port is 10000 ten thousand At this point TCP is not supported by the DRM Modulator and should not be used Only UDP should be selected Once you save your Content Server GUI Ethernet settings to the INI file by pressing the Send button please close the Content Server and Content Server GUI and restart them Then your new Ethernet settings will be used Do not use the MDI Output to File option unless you need the Content Server to be generating a large file that shows the output of the Content Server for compatibility testing or development O
46. M MOD 100 Transmitter Modulator star verensst mmelse med de v sentliga egenskapskrav och vriga relevanta best mmelser som framg r av direktiv 1999 5 EG Danish Undertegnede HARRIS Broadcast Communications erkl rer herved at f lgende udstyr DRM MOD 100 Transmitter Modulator overholder de v sentlige krav og vrige relevante krav i direktiv 1999 5 EF German Hiermit erkl rt HARRIS Broadcast Communications dass sich dieser diese dieses DRM MOD 100 Transmitter Modulator in Ubereinstimmung mit den grundlegenden Anforderungen und den anderen relevanten Vorschriften der Richtlinie 1999 5 EG befindet BMWi Hiermit erkl rt HARRIS Broadcast Communications die Ubereinstimmung des Ger tes DRM MOD 100 Transmitter Modulator mit den grundlegenden Anforderungen und den anderen relevanten Festlegungen der Richtlinie 1999 5 EG Wien ME THN MAPOYZA HARRIS Broadcast Communications AHAQNEI OTI DRM MOD 100 Transmitter Modulator 3YMMOP ONETAI MPO TIX OYZIOAEIZ AMAITHZEIZ KAI TIX AOINE SXETIKEX AIATA EIZ THX OAHTIAS 1999 5 EK Italian Con la presente HARRIS Broadcast Communications dichiara che questo DRM MOD 100 Transmitter Modulator conforme ai requisiti essenziali ed alle altre disposizioni pertinenti stabilite dalla direttiva 1999 5 CE Spanish Por medio de la presente HARRIS Broadcast Communications declara que el DRM MOD 100 Transmitter Modulator cumple con los requisitos esenciales y cualesquiera otras disposiciones aplicab
47. TECHNICAL MANUAL 888 2001 895 DRM Modulator System SDrm CEO 0470 T M No 888 2001 895 Printed March 2006 Rev A1 03 16 2007 Copyright Harris Corporation 2005 2006 2007 All rights reserved ii Returns And Exchanges Damaged or undamaged equipment should not be returned unless written approval and a Return Authorization is received from HARRIS Broadcast Communications Division Special shipping instructions and coding will be provided to assure proper handling Complete details regarding circumstances and reasons for return are to be included in the request for return Custom equipment or special order equipment is not returnable In those instances where return or exchange of equipment is at the request of the customer or convenience of the customer a restocking fee will be charged All returns will be sent freight prepaid and properly insured by the customer When communicating with HARRIS Broadcast Communications Division specify the HARRIS Order Number or Invoice Number Unpacking Carefully unpack the equipment and preform a visual inspection to determine that no apparent damage was incurred during shipment Retain the shipping materials until it has been determined that all received equipment is not damaged Locate and retain all PACKING CHECK LISTs Use the PACKING CHECK LIST to help locate and identify any components or assemblies which are removed for shipping and must be reinstalled Also remove any shipping s
48. Terminal Modulator ID ClippingRatio 100 4 DRM Test Ok DACDelay 5 28 Set ID Ok DACBias 720 Initialization Ok Mode 22 98 AM 750 Hz lv ClippingRatio 100 Mode 22 Frequency 1250000 Hz Freq 1250000 T a oe ClockMut 1 Clock Mut 1 oe 100 Amplitude Gain 100 al Mode 22 Adjustment Ok DAC Delay 5 28 gt usec Freq 1250000 Ok DAC Bias 720 lt mV 1500 0 ai g Clipping Ratio 100 2 100 none AmpGain 100 gR Read All Q Check For Data amp Clear Terminal v Phase Correction Curve Size 1 Co Close O Directional Drag Apply All Reset Phase Plot 00000000000000000000000000 Figure 3 13 Modulator set to Mode 22 with MCI Phase Correction window opened 6 Place the Modulator in AM Mode 22 and activate the Phase Corr button of 3 44 the MCI This opens another program window with a graphical presenta tion of the IPM amplitude dependent Incidental Phase Modulation correc tion Adjust the bias until the negative modulation is between 96 and 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Phase Plot 80 80 70 60 50 30 20 15 105 000 251 251 246 246 241 241 236 236 236 236 241 241 2 Phase Correction Section 3 Operation 98 as indicated on the Modulation Analyzer or an oscilloscope Set the Modulation Analyzer to detect phase modulation and feed its demodulated signal
49. V 1500 0 Clipping Ratio 80 100 none GE gt E E Rain e Q Check For Data amp Clear Terminal Figure 3 4 MCI after initial startup From this screen you must enter in the transmitter s carrier frequency in Hz It should match the frequency in kHz that is set on the switches on the DRM Modulator board Under the Mode section select the down arrow and scroll down to Mode 22 3 16 07 888 2001 895 3 35 WARNING Disconnect primary power prior to servicing Section 3 Operation On the DAC Delay section use the up arrow to select 10 56 as a starting point On the DAC Bias section use the down arrow to select 1250 as a starting point On the Clipping Ratio section use the up arrow to set it to 100 S77 DRM Modulator Control Interface MCD dd 7 Yd Be File Special Help Terminal Modulator ID DRM Modulator Control Interface a ET Initialization Frequency 1250000 Hz Clock Mult 1 Ne Amplitude Gain 100 lt 1 Adjustment DAC Delay 10 56 usec Adjust mV 1500 0 Clipping Ratio 100 100 none Read All Phase Corr E SEs Check For Data Clear Terminal DAC Bias 1250 lt gt lt gt lt gt Figure 3 5 Example of having entered initial settings into the MCI before sending them to 3 36 the Modulator Later you must change DAC delay DAC bias and phase correction coefficients T
50. ail etc that would cause dropouts in the transmitted DRM signal Switch to this option if you are having problems getting the Ethernet pack ets from the Content Server to be broadcast by the DRM Modulator It will allow a diagnostic computer to be connected to the hub as well to sniff packets on this Ethernet segment Ethereal is a program which can help 888 2001 895 2 7 WARNING Disconnect primary power prior to servicing Section 2 Installation in this diagnosis It is available free from http www ethereal com down load html Transmitter site MDI data DEM Content Modulator Server Ethernet hub Figure 2 2 Ethernet Hub Method 3 Ethernet Switch An Ethernet Switch is connected in the same way as an Ethernet Hub A switch may be more expensive and will not allow for packet sniffing as an Ethernet Hub would You might try this option if you already have an Ethernet Switch as part of a network at the transmitter site This method has not been tested exten sively but may be convenient if your Content Server and DRM Modulator must be located far apart in the same building If problems occur with this method check for excessive broadcast traffic on the LAN Local Area Network using a packet sniffing program as 2 8 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 2 Installation described in the Ethernet Hub section Broadcast packets are sent to a
51. al AM 10 kHz strong protection good quality param stereo 22 kbps Local AM 10 kHz high noise env 16 QAM lower quality mono 15 kbps Sky wave AM 10 kHz high protection fair quality mono 17 5 kbps Standard Analog AM Possible bits in MSC 13908 1738 bytes On the Configuration tab in the GUI pressing one of the Presets buttons will load a complete set of settings into the GUI Check the settings are what you really want to use possibly making modifications to make the settings more suitable Once you are satisfied with the settings press the Send button to make your changes go on the air When you press Send the settings from the GUI will be written to your configuration file so that the CS program will immediately change the DRM signal it is sending to the Modulator 3 3 2 2 1 Load Save presets If you want to change one of the Presets you should give it an appropriate description in the Configuration Description edit box 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation x M VUMeter l Timing HARRIS F Clocktime to AM Send Show Diagnostics DRM CSB 100 Content Server Configuration Transmission Service 0 Service 1 Service 2 Service 3 output About Load Configuration Description Save normal configuration Mode B 10 kHz 71 PL parametric stered Predefined Configurations Local AM 10 kHz weak protection h
52. ase visit our Website at www broadcast harris com Broadcast Communications Division 4393 Digital Way Mason OH USA 45040 phone 1 513 459 3400 email broadcast harris com www broadcast harris com Trademarks and tradenames are the property of their respective companies a Copyright 2005 Harris Corporation Printed in USA on Recyclable Paper HMC 16676 PP ADV 3214 03 05
53. ated powerful out of the box features and benefits for the DX owner including gt Easy Installation with DX 3DX and DAX Transmitters The DRM MOD 100 Modulator is a rack mounted item that integrates with the normal transmitter oscillator board thereby assuring tight control of all oscillator functions COFDM modulation SWR protection and easy transition from analog to digital operation via the content server command gt Simple Connectivity The DRM MOD 100 Modulator can be fed from a local Content Server via RS232 or remotely fed via an STL or Ethernet network feed gt Flexible Dual Mode Operation The DRM MOD 100 Modulator includes the ability to switch easily between DRM and analog operation via commands from a local or remote content server or from a local control switch gt Reliable On Air Continuity The DRM MOD 100 Modulator provides a user selectable fallback setting designed to immediately change to analog mode in the event of loss of the DRM feed gt Convenient Set Up and Evaluation The DRM MOD 100 Modulator comes with a Modulator Control Interface tool set the DRM MCI 100 for use with a customer supplied computer The MCI tool set is used for initial DRM MOD 100 set up and periodic system checking gt Maximum Server Flexibility The DRM MOD 100 Modulator can be fed from any DRM compliant content server such as the Fraunhofer Content Server solution Harris makes upgrading to DRM as simple as possible
54. binet so it will show up in the bill of material for the Control Cabinet The tree structure of this same index is shown to the right of the table and shows indentation level versus tree structure level Example of Replaceable Parts List Index and equivalent tree structure Replaceable Parts List Index Part Number_ Page Table 7 1 Transmitter 994 9283 001 7 2 Transmitter Table 7 2 Control Cabinet 992 9244 002 7 3 994 9283 001 Table 7 3 Controller Board 992 8344 002 7 6 Table 7 4 PA Cabinet 992 9400 002 7 7 Control Cabinet PA Cabinet Output Cabinet Table 7 5 PA Amplifier 994 7894 002 7 9 Table 7 6 PA Amplifier Board 992 7904 002 7 10 Table 7 7 Output Cabinet 992 9450001 7 12 Controller Board 992 8344 002 The part number of the item is shown to the right of the descri that part number starts Inside the actual tables four main heauings are useu PA Amplifier 992 7894 002 PA Amplifier Board 992 7904 002 Table ITEM NAME HARRIS PART NUMBER this line gives the information that corresponds to the Replaceable Parts List Index entry HARRIS P N column gives the ten DIGIT Harris part number usually in ascending order DESCRIPTION column gives a 25 character or less description of the part number REF SYMBOLS EXPLANATIONS column 1 gives the reference designators for the item i e C001 R102 etc that corresponds to the number found in the schematics C001 in a bill of material is equiva le
55. centered on a zero frequency with the subcarriers at positive and negative frequencies Negative frequencies do not exist in a simple amplitude varying real signal but they do exist if a signal has both in phase real and quadrature imaginary components as a bj This signal can be converted to one centered on any real frequency by multiplying it by a signal of the form sin t cos t where 2 f However doing this at a megahertz frequency requires excessive computing resources It is done much more efficiently using a special purpose Direct Digital Synthesis chip 4 3 6 Amplifying The I in phase and Q quadrature signals could be fed to two DACs in a DDS to directly generate a transmittable RF signal but amplification in a high power linear amplifier is very inefficient The reason is the 10dB peak to average power ratio of the signal This is true of any signal composed of a large number of independently modulated carriers Much more efficient amplification is possible using the EER method envelope elimination and restoration with a high level modulated transmitter like the DX series 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 4 Theory This amplification method was originally developed for high power single sideband transmission which has a similar peak to average ratio problem The IQ signal is converted to two signals One is a constant amplitude RF signal contain
56. change the signal between adjacent points a small very voltage difference in the demodulator 2 produce 2 times this change and the last 2 4 times The bits which produce large differences are of course much less susceptible to errors due to noise or intersymbol interference The most susceptible bits are therefore encoded at a low FEC code rate low ratio of information bits to check bits and the least susceptible with a high code rate few check bits The Viterbi decoding algorithm used in the receivers is most effective in correcting scattered random errors but vulnerable to burst errors However errors caused by impulse noise may knock out an entire symbol and interference from non DRM transmitters and multipath tend to knock out the same carriers in several successive symbols This is combated by interleaving the encoded data in frequency and in time between symbols After de interleaving in the receiver adjacent bit errors are scattered throughout the frame for easier correction The MSC bit stream is divided into two three or six different portions depending on QAM configuration and whether a higher protected part is used Each portion is encoded at a component code rate which depends on the overall code rate and its level in the QAM constellation most mid or least significant bit The convolutional encoder looks at the newest and 6 previous input bits and generates four new code bits For 888 2001 895 4 3 WARNING Disconnect pri
57. cing Section 2 Installation Studio site Transmitter site DEM Content Modulator Server arith switches via Ethernet hubs and or i MCI Setup putere MCT laptop temporary audio source for setup Figure 2 4 ISDN Method Ethernet Port 1 connection configurations are summarized below If your Content Server is connected to your local LAN you may wish to access it remotely for instance to update text messages This would make sense if your studio and transmitter are at the same location or if your Content Server is at your studio and your Modulator at the transmitter site The following diagrams summarize these two different scenarios On air room Transmitter room Local LAN DJ Ethernet 1 DRM computer e l Modulator via serial text messages MCI Setup audio source Figure 2 5 Studio and Transmitter at Same Location In the above setup your studios are at the same location as your transmitter Your DJ has a computer in the On air room that is used to setup text messages which are then sent over the local LAN to the DRM Content Server using its Ethernet 1 port Since the 2 10 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 2 Installation entire radio station is located at one site the DRM Content Server and DRM Modulator can be mounted in the same rack and connected with serial cables Studio site Transmitter site On air room
58. ctiveJ7 13 Ext_In1 JP17 1 2 External Volts Required on J10 20 for pull ups on J10 Outputs gt NOTE The Potentiometer Settings table below assumes the following 10dBm input to the Local Audio Input Connector J5 DRM exciter has already been setup Bypass selection on the Front panel must be enabled Transmitter is OFF 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 2 Installation Table 2 5 Potentiometer Settings Pot Level Description R79 Adjust R79 for 7 00Vp p at TP17 Local Audio Gain Adjustment Set Modulator to BYPASS MODE and set Dipswitch 4 to ON this puts the Modulator in FIXED DRM MODE Set MCI Software to TEST MODE with 98 Modulation R100 R80 Adjust R100 and R80 until the Waveform at TP12 is the same when selecting Dipswitch 4 to ON OFF DRM Audio Input Audio M atchup R100 adjusts the DC BIAS and R80 adjusts the AUDIO DC R53 Adjust R53 for the same Volts Peak to Peak value at TP11 TP12 Alternate Audio Adjustment Input Audio for the Alternate Audio Input will need to have Audio DC to use as another backup audio Option 3 16 07 gt NOTE Any change in the clipping ratio or DC Bias setting on the MCI software will result in a different carrier level when the DRM Content Server is set to AM Mode You will need to readjust the above settings if you want the Carrier level to be the same
59. d 300 Hz apart in each 4 kHz sideband of a dual independent sideband transmitter a total of 24 TTY channels per transmitter This implementation used a separate oscillator phase modulator and receiver channel for each subcarrier This point to point system used requested repeats IRQ for error correction Newer implementations generate and modulate the multiple carriers digitally in a digital signal processor DSP at much lower cost and circuit complexity The amplitude and phase or real and imaginary parts for each carrier during one symbol is placed in an array of vectors Taking the Inverse Fast Fourier Transform IFFT of this array gives a sampled output signal which is the sum of all the modulated subcarriers during the duration of one symbol Interpolation frequency translation and digital to analog conversion produce a transmittable output To get the required total bit rate for encoded audio necessary control information and forward error correction into a single broadcast channel it is necessary to use digital modulation which sends several bits per frequency per symbol In the DRM system one carrier for the duration of one symbol is called a cell DRM uses 4 QAM with 2 bits cell 16 QAM with 4 and 64 QAM with 6 COFDM coded OFDM adds forward error correction FEC and interleaving in both time and frequency to make OFDM much more robust In the 64 QAM mapping 2 bits 1 in phase and 1 quadrature which is 90 out of phase
60. de Mono e SM 16 QAM MSC 4 QAM SDC e Parametric Stereo J SM 64 QAM MSC 16 QAM SDC e Stereo e HMSym 64 QAM MSC 16 QAM SDC e Audio Source HMMix 64 QAM MSC QAM SDC o Live input Interleaver Depth WAV file e 0 4 Second Short Interleaving J Service Configurations 2 0 Second Long Interleaving Number of Services 18 kHz 20 kHz 3 4 5 kHz 5 kHz 9kHz 10 kHz J 1 service e ato A services e Code Rates Protection Levels P All Standard Modulation Rates e Types of Services i HMSym and HMMix Rates e Audio Services e Text Message e Equal Unequal Error Protection Packet Mode Equal Error Protection EEP e Conditional Access Unequal Error Protection UEP J Display and Reconfiguration Other Features 3 character Service Identifiers J CS control of analog DRM modes e 16 Service Language e Basic MCI Integrated With CS J Specification Possibilities Professional Audio Card e 30 Service Program Serial Distribution Interface J Type Possibilities Ethernet Distribution Interface e 16 Character Service Labels J Date and Time e Advance Notice of Reconfigurations 3 Character Target Language 2 Character Country of Origin Alternate Frequency Signalling Multimedia Multimedia Functionality To learn more about Harris DRM solutions and our complete line of digital and digital ready technology visit us online at www harris com globalradio Specifications are subject to change For a complete listing of the most current specifications ple
61. dio Samplin 8kHz ping 12 kHz 16 kHz 24 kHz 4 The Audio Sampling Rate selection options are 8 12 16 and 24 kHz Higher sample rates sound better All of the sample rates listed can be used r SO Source PRBS test aac file wav file live audio 5 The Source selection should be set to live audio Changing this option in the GUI will not affect the Content Server This is because the since the script which runs the Content Server forces it to use live audio input unless it is started with an audio file for instance if a wav file is dragged onto the icon for DRM CS amp GUI The wav file must be in 48 kHz 16 bit stereo format 3 3 2 5 2 Limitations Mo VUMeter l Timing l Clocktime M Show Diagnostics DF S0 Service Label ey x m I 3 28 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Section 3 Operation If the Show Diagnostics check box is enabled the GUI will inform you of changes it has to make to the audio parameters i FOR AAC Coding of greater than 699 Coder Sampling Rate must be 24000 Changes are made for instance if the Transmission tab has configured your DRM channel to have too few bytes available in every DRM frame for the high quality audio you are requesting Then the GUI will change your audio to the highest quality that is available for the bit rate you are have available 3 3 2 6 CS Diagnostic and Status Output O
62. e If you have an automation system that automatically generates messages those may be copied via LAN using a script which will secure copy to the file home drm drm Stream0TextMessage txt This will require knowing the user account name which is drm and the user password which is harrisdrm Text messages on the Content Server can be updated over its Ethernet ports Make sure that you use an SSH client that is capable of transferring files such as WinSC WinSCP is available from http winscp net or http winscp sourceforge net 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 4 Modulator Control Interface MCI Software This application controls specific parameters the optimize the DRM signal generation These are modulator and transmitter specific and not part of the DRM specification To start the MCI select the desired desktop and click the MCI icon on the task bar at the bottom of the screen The icon looks like a heartbeat monitor display d DRM MCI Then the MCI main dialog box should appear 4 DRM Modulator Control Interface MCI 5 x File Special Help Terminal Modulator ID DRM Modulator Control Interface Set ID Initialization Mode 00 normal DRM mode v Frequency B 1000000 E Amplitude Gain 100 K E Adjustment a DAC Delay 0 00 usec i Adjust DAC Bias 0 m
63. e ETSI DRM Specification The possibilities are 4 5 kHz 9 kHz 18 3 18 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Section 3 Operation kHz 5 kHz 10 kHz and 20 kHz The first three were designed for use in Europe and the last three for use in the United States Radio transmissions above a certain power level are regulated by governments and regulatory commissions A radio station must be licensed to broadcast on the AM bands or on shortwave frequencies This regulation ensures that transmission will not interfere with existing radio stations A government will assign a frequency also called a channel frequency to a radio station when it receives a license The station is required to broadcast radio waves of that frequency using the amplitudes and phases of the waves to send their information The signal includes slightly higher and slightly lower frequencies sidebands which must be kept within the assigned channel bandwidth Europe and the USA have different specifications as to the requirements of this envelope inside which a radio station must transmit its signal If more bandwidth is available more data can be sent for better audio fidelity The Spectrum Occupancy specifies the bandwidth that the DRM system will be using If you use a higher Spectrum Occupancy the audio will sound better because the DRM system can use more frequencies slightly above and below the center frequency for transm
64. e Unused so SBR Flag live audio pee Tecla 50 Service Descriptor lt Arabic C No program type Other music 0 Audio Mode _ Bengali C News C Weather mono Chinese Mand C Current affairs C Finance param stereo C Dutch C Information Childrens oo M 0 Text Flag English Sport Social affairs UE SoEnh ne French C Education Religion 0 Audio Sampling nhancement Flag German _ Drama _ Phone in 8kHz Hindi Culture _ Travel 12kHz Japanese C Science _ Leisure 16 kHz Javanese Varied Jazz music 24 kHz Korean C Pop music C Country music apes Portugese C Rock music National music C Russian C Easy listening Oldies music Spanish Light classical lt Folk music Other lang Serious classical Documentary Possible bits in MSC 13908 1738 bytes The Stream 0 tab of the GUI allows the user to set DRM and audio parameters that apply to the first stream The changes you make to many of these values will reach all the way to the Receiver software For most of these settings the information is placed in the FAC and sent to the exciter where it is transmitted as part of your DRM signal The options are set in the Service 0 tab of the DRM Content Server GUI S0 Service Label Harris Broadcast 1 The Service Label is displayed by many DRM receivers It can be used to indicate the name and call letters of the radio station 3 16 07 888 2001 895 WARNING Disconnect primary power prio
65. el is done in the exciter using the DRM Diagnostic Program The time delays in the RF and envelope paths to the modulated amplifier have to be equal within sec Transmitters normally have significantly more delay in the audio section than in the RF Using the Diagnostic Tool software included with your DRM Demo System the exciter can be set to compensate for delay differences from 0 to 165 sec in 0 33 sec steps It also can compensate for time delay variation of up to 5 sec over the audio frequency range Another common transmitter problem is IPM incidental phase modulation Even with constant drive phase the phase of the RF output varies with the output voltage amplitude The most abrupt variations appear as the output approaches 0 100 negative modulation in AM The exciter can generate an AM carrier 98 amplitude modulated with a 750 Hz sine wave for use with an external RF Phase Meter to test this The Diagnostic Tool permits the operator to compensate for IPM at 25 points over the range from 0 to peak output 3 16 07 888 2001 895 4 5 WARNING Disconnect primary power prior to servicing SLOWSY W901 AN3S3ud IAW SSVdAd WOOT Jinvs YOLVINGOW 11nvs IGN SLOWSYH 1V901 XL DOTVNY SSYdASAYNWNHON xL Iv u9 STOYLNOO saal aHyog 39Y4431NI TANVd LNOH4 Bunno x p ddoys s panara Buraq s eeg uaym uonsisues L MOT O UBIH NPY 18884
66. es listed as Visible may be zero for several minutes This is normal The number of satellites listed as Tracked is more important The DRM Modulator will not adjust the onboard oscillator trim unless all of the following conditions are met A Content Server input must be connected 3D Fix must be obtained by the GPS receiver GPS Receiver antenna status must be reported as OK If those conditions are all met the DRM Modulator will automatically clock its local oscillator using the GPS timing information 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Section 3 Operation 3 8 1 Resolving GPS problems The GPS Antenna status can be returned as any of the following Antenna OK normal Antenna Overcurrent short Antenna Undercurrent open circuit Connector problem to GPS receiver not receiving antenna bias voltage from DRM Modulator board Unknown If you receive the Antenna Undercurrent error please make sure that your antenna is connected If it is overcurrent check that the cable is not crushed If you suspect a problem with the cable try using a short length of cable between the GPS antenna and the corresponding connector on the DRM Modulator Please make sure to place your antenna in a location where a clear horizon to horizon view of GPS satellites can be obtained Otherwise for example if you just set your antenna on a led
67. esses in sequence from a pool for instance from 192 168 0 100 to 192 168 0 254 The recommended method is to use Static IP addresses For your system to perform at its best you will need to manually assign a static IP address and enter the subnet mask you are using Also enter the IP address of the router the CS should attempt to contact in order to access the Internet called the Default gateway and the IP addresses of DNS servers DNS servers are computers that provide Domain Name Service that the Content Server should contact to resolve domain names to IP addresses For example a DNS sever would resolve time nist gov to 192 43 244 18 Use the following guidelines when selecting a static IP address for the DRM Content Server Ethernet 1 connection gt NOTE Remember that the Ethernet 1 connection is used to connect to the local LAN in the radio station If you are connecting to an existing network contact the network administrator or the company or individual that setup the network Ask for static IP addresses that you can use that will be on the local LAN s subnet but outside of the pool of DHCP addresses Basically you re placing a new server on the local LAN your Content Server and you need a Static IP address for it Make sure that you do not set the IP Address of the DRM Modulator to an IP address that is already used by another device or computer Do not use an Internet IP address unless it is assigned t
68. ge inside a window in a metal building you will probably only get a 2D fix but spend a lot of time in Acquiring and Bad Geometry The GPS system on your DRM Modulator would be ineffective Instead with the antenna mounted outdoors or just underneath a wide skylight it should be possible to obtain a 3D fix with for example 9 of 9 satellites visible being tracked The GPS Receiver status can be returned as any of the following Reserved Bad Geometry GPS antenna needs a better view of the sky not just a patch over head but horizon to horizon Acquiring starting up normally e Position Hold Propagate Mode 2D Fix 3D Fix normal operation No communication between DRM Modulator board and GPS receiver module Remove GPS module and check to see that its connector to DRM Modulator board still makes contact after shipment Bend connector pins slightly if needed 888 2001 895 3 51 WARNING Disconnect primary power prior to servicing Section 3 Operation If you receive error messages about the DRM Modulator not being able to communicate with the GPS module or not receiving its bias voltage please consider bending these pins on the GPS module Antenna connection Transmit data Receive data 3 volts DC 1 pulse per second ground 2 volts to 2 2 volts DC battery voltage N OO fF WD DY 5 volts DC antenna bias voltage Pins 1 2 and 3 should be bent sli
69. ghtly if you receive the error No communication between DRM Modulator board and GPS receiver module Remove GPS module and check its connector to DRM Modulator board still makes contact after shipment Bend connector pins slightly if needed This is common with brand new never used GPS receiver modules and just assembled DRM Modulator boards After shipping the pins could become unbent so this may need to be performed again Pin 7 should be bent if you receive the error Connector problem to GPS receiver not receiving antenna bias voltage from DRM Modulator board 3 52 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 9 Saving MCI Settings gt 4 DRM Modulator Control Interface MCI Bek Eile Help Term Firmware Version Modulator ID ock Firmware Checksum _DRM Test AmpC Mode E Load Firmware zis Se Ok Save Parameters Initialization ag TETVVUT Mode 22 98 AM 750 Hz iv ClockMult 1 Frequency 1250000 luz Ok AmpGain 100 Clock Mult 1 ka PhaseCorr 2000000000001 A pA lala PhaseCorr 1000000000 0 0 iL etude Gain 100 as PhaseCorr 1025000000000 Adjustment PhaseCorr 10 25 350000000 DAC Delay 5 28 usec PhaseCorr 10 25 35 4000000 O _ _ Adjust PhaseCorr 10 25 35 40400000 DAC Bias 720 v mV 1500 0 PhaseCorr 10 25 35 40 40 35 00 eres a IPhaseCorr 10 25 35 40 40 35 35 3 7 Clippi
70. he rest of this section If you are using a digital or unbalanced analog input the appropriate configuration and mixer setting are set through the HDPS Configuration and HDSP Mixer tools which can be run by clicking on their appropriate icons on the task bar at the bottom of the screen Table 3 1 outlines the various options and connection methods 888 2001 895 3 3 WARNING Disconnect primary power prior to servicing Section 3 Operation Table 3 1 Audio Connection Method Type of Audio Feed Break Out Cable Requirement Method of Connection Optical cable TOSLINK to upper most Configuration Settings Sample 48 0 kHz AEB unchecked Mixer Settings default no sliders up on Analog unbalanced 15 pin w 4 phono lower D socket Unbalanced stereo cables to Line IN L and LINE IN R phono sockets Pref Sync Ref ADAT In Sample 48 0 kHz AEB checked Breakout cable un checked Pref Sync Ref ADAT In Input Level 10 dBV ADAT optical Optica DRR optical connector on bracket of RME card Breakout cable unchecked any channel Pref Sync Ref ADAT In eee ae In 9 slider up on A1 2 A Optical cable TOSLINK to upper most nee pres In 10 slider up on A1 2 SPDIF optical none i AEB checked i optical connector on bracket of RME card A A1 out slider up Breakout cable unchecked A2 out slider u Pref Sync Ref ADAT In P Zai a ie In 9 slider up on A1 2 i 9 pinw 2 RCA amp 2 Coax cable to white
71. hese will be different but similar for each transmitter that rolls off the assembly line The time delays in the RF and envelope paths to the modulated amplifier have to be equal within 1 sec Transmitters normally have significantly more delay in the audio section than in the RF Using the DRM MCI Program the Modulator can be set to compensate for delay differences from 0 to 165 sec in 0 33 sec steps It also can compensate for time delay variation of up to 5 sec over the audio frequency range Another common transmitter problem is IPM incidental phase modulation Even with constant drive phase the phase of the RF output varies with the output voltage amplitude The most abrupt variations appear as the output approaches 0 100 negative modulation in AM The Modulator can generate an AM carrier 98 amplitude modulated with a 750 Hz sine wave for use with an external RF Phase Meter to test this The MCI program permits the operator to compensate for IPM at 25 points over the range from 0 to peak output 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 5 Turn On the Modulator Chassis Remove the top cover on the Modulator Chassis When all connections have been made and the Content Server and Modulator Control Interface are running turn on the modulator with the rear panel switch If the DRM Modulator Board is creating a DRM signal two green LED lights near the ribbon cable connecto
72. hysical hardware here Multiple logical devices can be Petes owe Waname oee Active profile Common You can edit the properties of ethO or eth1 by clicking on it to highlight it and then clicking the Edit button labeled with a wrench icon and the word Edit For instance if you were to edit eth0 you might see something like the following 888 2001 895 WARNING Disconnect primary power prior to servicing 3 16 07 3 16 07 Section 2 Installation 4 Ethernet Device elx General Route ardnare Devi Nickname ethO Activate device when computer starts C Allow all users to enable and disable the device C Enable IPv6 configuration for this interface Automatically obtain IP address settings with dhcp DHCP Settings Hostname optional Automatically obtain DNS information from provider Manual IP Address Settings Address 10 2 2 103 Subnet mask 255 255 0 0 Default gateway address 2 OK 8 Cancel The important items to notice in this dialog are that the Activate device when computer starts checkbox is checked and the device is configured for the Static unchanging IP address of 10 2 2 103 with a subnet mask of 255 255 0 0 The subnet mask must be set to this value in order for the Content Server to be able to access the DRM Modulator when the DRM Modulator has an IP address of the form 10 2 3 x for example 10 2 3
73. igh quality stereo 35 kbps Local AM 10 kHz strong protection good quality param stereo 22 kbps Local AM 10 kHz high noise env 16 QAM lower quality mono 15 kbps Sky wave AM 10 kHz high protection fair quality mono 17 5 kbps Standard Analog AM ossible bits in MSC 9900 1237 bytes Then press the Save button A window will appear asking which button you want to save your settings to Click on the button you want to overwrite Button1 ini through Button5 ini and click Save Button 1 is the top preset button and the button numbers increase going down 3 16 07 888 2001 895 3 15 WARNING Disconnect primary power prior to servicing Section 3 Operation VM Save DRM Configuration BGI Look in momesarmiirm CE E E G z BS temp _ Button2 ini _ Buttons ini Ld Buttong ini _ Buttons ini _ DRM ini File Name Jeuttont Jini File Type DAM ini file Cancel T Open as read only Now the Preset button should be updated to be labeled with the description that you entered When you press it it should load the configuration that you saved 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation M VUMeter l Timing HARRIS F Clocktime to AM Send Show Diagnostics DRM CSB 100 Content Server Configuration ITransmisston Service 0 Service 1 Service 2 Service 3 output About Configuration Description
74. ill that is higher in the tree structure This is often the case for components that may be frequency determinant or voltage determinant and are called out in a higher level bill structure that is more customer dependent than the bill at a lower level 3 16 07 888 2001 895 vii WARNING Disconnect primary power prior to servicing 168 6608 BEB OLYWEHOS SINAN L0G GZO8 Z68 uo pesn Loo Bs NMONY JI ATENaSSY H3HSIH LXIN Na dasn Wall 239 OOLY aca B a AWN SONSYSI94 J0N343434 JLYAJHIS addy xOQ xxx ZEB D Ayjonen S A quuesso 4JayBiy PXSuU BY A qwasso JeYOIW Jxau YO JEQLUMU JO JEQLUNU SIJOWaYyos UOMOLUIOJU DHOWSYIS 4 SPN ajgissed yi e synod ag ul Uolduosep ay Busen quod ay aquasag Jepun pewepsc SHEA Aup soy PePNOOUl eg LSNA 4equuinu Pes Syl HUn ayp yo xSEq Fy uO aod g Haw su Uo punc aq pi JeqLUNU joas pue seqguwnu pod A QDIIDAD jou 5 HEA ay H JO sseuposos Jeg Jequnu ped ayy Buryaaya ayqnep mayo pp ay IvAy di LS Slavd Wows HAGMAN Led SiyayH THC je way NOWWOIEdS NOWdIYoSI SAWN 5 Luyd ddvd 40 NOUWdldos40 ALO MFEAN Trias LNIANO KYUDO HJAAAN Lavd LNIAdINDI SLUDU zuswdnbs ay pnygeqns P Buypoo USYSUUeLU ayajduaa BYU a qissed Sp UCITDUUOUuT YON Sp 6 Buy Luo Japao Spd Bulwoyjo oy e80 aspalq Slad ONIHS0dO 04 SdIno OANA s44dd GOHLAAN ONiddlHsS OSEAN AWS ASEAN SAN
75. ing all the phase information from the IQ signal This is fed through the normal RF driver chain of the transmitter to the modulated amplifier stage The phase of a complex signal can be derived using the arctan x function The other is the magnitude amplitude of the IQ signal which is fed to the audio input of the transmitter Interestingly both of these signals have a bandwidth much greater than the band width of the desired output signal but when they are combined in an ideal analog multiplier the out of channel sidebands can be cancelled to 50 to 60 dB below the desired in band carriers If either of these signals is band limited the cancellation fails To do this in a practical transmitter requires a few transmitter modifications and pre compensation in the exciter for other characteristics of the transmitter The audio envelope amplitude input should have a flat response from dc to 40 kHz or better with a nearly constant time delay over this range Reducing the component values in the DX input Bessel filter by a factor of 4 has given satisfactory results The RF driver should have a bandwidth of at least 0 5 MHz The RF output carrier level control on the Analog Input board should be set to its minimum In a DX series Harris transmitter this is the R27 MAX POWER ADJUST potentiometer you are instructed to turn fully counterclockwise in the process of installing your DRM Exciter Board Fine adjustment of the zero output lev
76. is also instructive From Audio to DRM Exciter Board Input In the Content Server the incoming mono or stereo analog audio signal is digitized by a consumer or professional audio interface card typically at 16 bits sample 24 ksps kilosamples second This 384 kbps kilobits second signal is then passed through an MPEG AAC encoder which reduces the bit rate to approximately 20 kbps with surprisingly little loss in perceived audio quality Stereo 768 kbps data can be encoded to about 26 kbps This data compression is extremely important if we are to transmit the signal in a 9 or 10 kHz bandwidth Ten 40 ms AAC frames are combined to form one 400 ms MSC frame and combined with control info in the FAC and SDC to form one DRM frame for transmission to the exciter The RS 232 link can operate at 38 4 57 6 or 115 2 kBdps kilobauds sec Interference types and solutions Unlike the IBOC system which is designed exclusively for local broadcasting the DRM system is designed to deliver a decodable signal to receivers even via ionospheric transmission paths such as MF nighttime skywave and HF shortwave to distant 888 2001 895 4 1 WARNING Disconnect primary power prior to servicing Section 4 Theory 4 2 locations The ionosphere is very unkind to digitally modulated and conventional AM signals It produces the following forms of signal distortion 4 3 1 Multipath radio wave propagation The ionosphere is composed of several layers
77. isconnect primary power prior to servicing 4 5 3 16 07 Section 4 Theory System Time Synchronization Synchronization of the system time is important in the Content Server for accurate time data transmission in the Service Description Channel SDC of the DRM signal This information is often displayed on the receiver Time synchronization is also especially important in Single Frequency Networks SENs This DRM system is not currently capable of SFN operation Single Frequency Networks SFNs require that several Modulators can be fed the same DRM MDI stream Despite propagation delay from the common Content Server each modulator can use the transmit timestamp present in the MDI stream to compare with GPS time in order to begin broadcasting that DRM data at precisely the same moment as all of the other DRM Modulators in the Single Frequency Network This requires 10 seconds of buffering DRM MDI data in the DRM Modulator It also requires that the Content Server can create accurate timestamps Those timestamps are derived from the system time The Content Server system time synchronization is done with a standard NTP Network Time Protocol mechanism If your Content Server cannot access any NTP servers you may have a GPS receiver connected to it via the Ethernet port in order for the GPS to serve as an NTP server for the Content Server 4 5 1 Audio Card GPS Option The DRM Content Server sends DRM MDI data to the
78. ission The 18 kHz and 20 kHz modes cannot be received by current FHG receivers You will typically use 9 kHz in Europe and 10 kHz in the USA You can use 4 5 kHz and 5 kHz to demonstrate system capabilities but because they have lower bandwidth the audio will not sound as good Robustness Mode Robustness A 5 Guard Interval Local Medium Wave B 20 Guard Interval General Sky Wave C 27 Guard Interval Severe Multipath D 44 Guard Interval Severe Multipath Doppler Robustness Mode specifies how many of the side carriers will be used for propagation measuring signals that can be used for error correction If more carriers are used for that then fewer are used for audio data So for short transmissions using few propagation measurement signals and more audio data is preferable For long distances and ionosphere bounces more error correction is needed than for short distances For a depiction of this see Annex L in the ETSI DRM Specification See Section 8 4 of the Specification for details concerning what kinds of propagation test signals there are and what their values are In addition Section 8 2 of the ETSI DRM Specification describes other significant differences between these modes DRM transmissions are organized into superframes Each superframe is 1 2 seconds longs and consists of three frames each frame 0 4 seconds long This is why the signals on the Content Server to DRM Modulator link are sent every 0 4 seconds Each fra
79. ke ihe ee a 4 7 BRM MDI Pecs oredan a eee cue nietin enaa 4 7 DRM MDIOK 0 0 eee ee eee 4 7 DRM MODE_0 MODE_1 MODE_2 4 7 DRM SPI os ei che ere eb Sie edie eas 4 8 DRM EXT_MODE 0 0 0000000 4 8 System Time Synchronization 4 9 Audio Card GPS Option 04 4 9 2 888 2001 895 WARNING Disconnect primary power prior to servicing HARRIS Section 1 Introduction 1 1 Introduction This technical manual contains the information necessary to install and operate the Harris DRM Digital Radio Mondial System consisting of the the DRM CSB 100 Content Server DRM MOD 100 Modulator and DRM MCI 100 Modulator Control Interface 1 2 General Description See Harris DRM brochure at rear of this manual 1 3 Features See Harris DRM brochure at rear of this manual 3 16 07 888 2001 895 1 1 WARNING Disconnect primary power prior to servicing Section 1 Introduction 1 4 Block Diagram Harris DRM System Simplified Block Diagram Harris DRM CSB 100 Content Server Contant Server Content Server wl Configuration Harris DRM MOD 100 Fee DRM Modulator Muhimedia content files CRM Multiplex Generator Audio input gard and M od ulator mixar Control Interface MCI ereatog or digital Harris DX Series Transimitter Figure 1 1 Harris DRM System Block Diagram 1 2 888 2001 895 3 16 07 WARNING Disconnect primary power
80. king ask if the DRM Modulator needs to have a Subnet Mask or default Gateway set The DRM Modulator does not have these settings because it does not access the Internet and only sends ARP replies Everything else it does is receiving ARP requests and UDP packets 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 8 3 16 07 Section 3 Operation GPS Status The DRM Modulator firmware starting with version 1 02 is capable of communicating with a GPS module mounted as a mezzanine board The add on module is the Motorola M12 Timing Receiver The GPS timing capability on the modulator is used to trim the local oscillator Trimming the local oscillator allows the broadcast frequency to be right on target It also keeps the DRM Modulator from operating too slow or too fast in its digital broadcasting More critically GPS synchronization keeps the DRM Modulator from operating too fast or too slow in consuming data from the DRM Content Server If it were to operate too fast the input would eventually in several weeks or months be consumed and 1 2 seconds of audio would be repeated once on the air If it operated too slowly 1 2 seconds of audio would be skipped Single Frequency Networks SFNs require that several Modulators can be fed the same DRM MDI stream Despite propagation delay from the common Content Server each modulator can use the transmit timestamp present in the MDI stream to compare wi
81. les o exigibles de la Directiva 1999 5 CE Portuguese HARRIS Broadcast Communications declara que este DRM MOD 100 Transmitter Modulator est conforme com os requisitos essenciais e outras disposi es da Directiva 1999 5 CE IS Declaration of Conformity R amp TTE Directive Manufacturer European Agent Harris Broadcast Systems Harris Systems Ltd 3200 Wismann Lane Eskdale Rd Quincy Illinois 62305 USA Winnersh Wokingham Berkshire RG41 5TS UK Equipment declared compliant by this Declaration DRM MOD 100 Broadcast Radio DRM Modulator We hereby declare this equipment to be in Conformity to the following Directive Directive 1999 5 EC of the European Parliament and of the Council of 9 March 1999 on radio equipment and telecommunications terminal equipment and the mutual recognition of their conformity Directives and Standard s used to verify compliance EN 301 489 1 V1 4 1 EMC Common Technical requirements 2002 08 EN 301 489 11 V1 2 1 EMC Specific Conditions for Terrestrial broadcasting transmitters 2003 05 EN 302 245 2 V1 1 1 Electromagnetic compatibility and Radio spectrum Matters ERM 2005 01 Transmitting equipment for the Digital Radio Mondiale DRM broadcasting service Part 2 Harmonized EN under article 3 2 of the R amp TTE Directive EN 60215 1989 Safety requirements for radio transmitting equipment A1 1992 A2 1994 The DRM MOD 100 modulator is Declared in conformi
82. ll ports on a switch since they are intended for all computers on the LAN Transmitter site MDI data DEM CEM Content Modulator Server Ethernet switch Figure 2 3 Ethernet Switch Method 4 Dedicated line such as an ISDN line See your dedicated line provider for details on how to connect switches or hubs to each end of the line One of the reasons for using Ethernet to con nect the Content Server to the DRM Modulator is specifically to make it possible to use this kind of connection The advantage of this method the transmitted DRM audio is encoded by the DRM Content Server right at the studio site As a result the listener hears less background noise when the DRM audio is decoded in his her receiver The disadvantage is that it can be difficult to set up and a dedicated line may cost more than a standard AM studio to transmitter link If the DRM Modulator is not receiving Content Server packets check that Content Server packets are arriving at the Transmitter site using a hub and a packet sniffing program If they are not arriving check that they are being transmitted into the dedicated line at the studio site If the system will still not work move the DRM Content Server to the Transmitter site get the system working there using one of the above methods and move the Content Server back to the studio once the dedicated line has been shown to work 3 16 07 888 2001 895 2 9 WARNING Disconnect primary power prior to servi
83. mary power prior to servicing Section 4 Theory 4 4 different component code rates more or fewer of these four output bits will be used If more are used then there is a greater chance of the receiver recovering the value of the input bit ETSI DRM Specification Section 7 3 2 and Section 7 5 1 describe this process in greater detail 4 3 3 Receiving in the same phase that was transmitted The receiver lacks a phase reference for demodulation Because transmission paths vary in length over time the received phase is continually varying relative to the transmitted phase To correct for this a number of cells scattered through the frame are designated as gain pilots These are transmitted with the same amplitude and phase in every frame and used as references to demodulate data cells which are close to them in time and frequency In the case of ionospheric propagation there may also be rapid variations in phase due to Doppler shifts caused by changes in layer height particularly at sunset For this reason the more robust modes use shorter symbols and more closely spaced reference cells 4 3 4 Getting the signal ready for the transmitter This channel encoding requires a great deal of digital processing of the data in the exciter and even more in the receiver but more processing is necessary to convert the output of the IFFT to a form suitable for use in a radio transmitter 4 3 5 Changing frequency The spectrum of the IFFT output is
84. me consists of from 15 to 24 symbols depending on 888 2001 895 3 19 WARNING Disconnect primary power prior to servicing Section 3 Operation Robustness Mode A symbol is a period of time during which carriers to the right and left of the center frequency keep QAM constellation point values A carrier at any specific moment takes on a different value depending on which symbol is occurring If it is a data carrier during that symbol the amplitude and phase of that carrier depends on the data being transmitted From 1 9 to 11 14 of every symbol is output again as a guard interval This repetition gives the receiver a longer time during which to measure the carriers The carriers may be hard to recognize after a difficult long distance transmission In this way the repetition of part of the signal in a guard interval provides additional error correction The normal output of the symbol is known as the useful part and the useful part and guard interval together make up the total symbol time Mode A uses a guard interval of 1 9 of useful part Mode B 1 4 Mode C 4 11 s and Mode D 11 14 5 For OFDM the carrier spacing must be the reciprocal of the useful symbol length t which is shorter for more robust modes Symbols in Mode A are 24 ms long so carriers are spaced at 41 2 3 Hz Mode B 21 1 3 ms and 46 7 8 Hz Mode C 14 2 3 ms and 68 2 11 Hz and Mode D 9 1 3 ms and 107 1 7 Hz For more details see Section 8 2 of the ETSI DRM Specificatio
85. mplitude audio signal chain than in the RF signal chain The difference can vary from a few microseconds for the DX series to approximately 120 microseconds for the DAX series transmitters 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation Compensation for the difference is set with the DAC Delay parameter in the MCI An error of as little as 1 microsecond will noticeably degrade a good spec trum This is adjustable in steps of 1 3 microsecond c All transmitters also have a phase shift in the final power amplifier that varies with the RF level modulation To read and adjust the compensation for the amplitude dependent phase shift click on the Phase button of the Modulator Con trol Interface This opens a window called Phase Correction Coefficients In DRM mode in the DX Series transmitters the transmitter Audio Gain becomes the average and peak power control and Maximum Power sets the bias level 3 6 1 Preliminary Setup Power and Bias bg DRM Modulator Control Interface MCI File Special Help Terminal Modulator ID ClippingRatio 100 DRM Test Ok DACDelay 10 56 Set ID Ok DACBias 1250 Initialization Ok Mode 22 98 AM 750 Hz i ClippingRatio 100 a Mode 22 Frequency 1250000 Hz Freq 1250000 ClockMult 1 Clock Mult 1 a srl 100 Amplitude Gain 100 lo Mode 22 Adjustment Ok DAC Delay 10 56 usec
86. n Mode A permits the best audio quality and Mode D gives the worst audio quality but the best error correction Most of the Medium Wave MW AM transmissions taking place today use Mode B Interleaver Depth Interleaver Depth 2 0 sec 0 4 sec The Interleaver Depth setting can be set to two seconds or four tenths of a second That is audio data from a specific audio frame is spread over 2 0 or 0 4 seconds of transmission Long interleave increases the decoding delay in the receiver but increases the signal s robustness against impulse noise and selective fading This is especially important in long distance broadcasts So use short interleave for faster audio reception for short distance transmissions and use long interleave for long distance broadcasts so that your signal can be decoded with less error QAM SDC Mode 16 QAM 4 QAM MSC Mode 64 QAM no hier SM 64 QAM hier on HMmix 64 QAM hier 1 Q HMsym 16 QAM no hier SM Which QAM you select for your signal also depends on whether you are planning on short distance transmission or long distance transmission QAM stands for Quadrature 3 20 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation Amplitude Modulation The same technique is used in computer modems to transmit digital data over analog telephone lines When it is used in radio digital data is transmitted over analog airwaves The first configuration to conside
87. n UEP Other Features Test Modes Independent of CS Analog Mode Basic Phase Compensation GPS Synchronization Serial Distribution Interface Ethernet Distribution Interface Compatibility with Industry DI To learn more about Harris DRM solutions and our complete line of digital and digital ready technology visit us online at www harris com globalradio please visit our Website at www broadcast harris com Specifications are subject to change For a complete listing of the most current specifications Broadcast Communications Division 4393 Digital Way Mason OH USA 45040 phone 1 513 459 3400 email broadcast harris com www broadcast harris com Trademarks and tradenames are the property of their respective companies Copyright 2005 Harris Corporation o Printed in USA on Recyclable Paper HMC 16676 PP ADV 3215 03 05 HARRIS j DRM CSB 100 Content Server DRM CSB 100 Content Server Multiplexer Dr m for DRM Harris DRM The future of radio technology starts here The DRM CSB 100 Content Server Multiplexer offers reliable DRM The Harris DRM CSB 100 Content Server Mutliplexer gets you there in a hurry Combined with the MOD 100 Modulator and the rugged and reliable Harris digital ready DX line of transmitters the DRM CSB 100 provides basic DRM broadcasting today with long term upgradeability for your digital radio future Loaded with all the standard required DRM features for variou
88. n if you have a crossover cable available but do not have or do not wish to use a hub or switch A crossover cable looks like a typical Ethernet cable but its two ends are wired differently so that two computers can communicate directly without a hub or switch An Ethernet crossover cable may be available at your local computer or office supply store The advantage of this option is that eliminates clutter but its disadvantage is that problems are harder to diagnose Transmitter site DEM DEM Content Modulator Server via Ethernet crossover cable Figure 2 1 Crossover Cable Method Normal Ethernet cables and an Ethernet Hub The Ethernet hub option requires 2 standard straight through Ethernet cables Most hubs have a port labeled Uplink that port would not be used in this application Connect the DRM Content Server to a normal port on the hub The LED on the hub corresponding to that port should blink with each packet that the Content Server sends Connect the DRM Modula tor to another normal port on the hub The LED corresponding to the DRM Modulator s connection should stay on steady During normal operation do not connect any other computers to the hub Since the standard DRM MDI protocol between Content Server and Modu lator uses the UDP IP protocol any packets that experience collisions will not be retransmitted If there is heavy traffic on the hub from additional computers copying files reading em
89. nect the Ethernet 0 connection to a DHCP server so that it is 3 16 07 888 2001 895 2 11 WARNING Disconnect primary power prior to servicing Section 2 Installation automatically configured you will have to find out what IP address it is using and set the DRM Modulator to a similar address but one that is not going to be used by the DHCP server to assign to another computer The DRM Content Server Ethernet 1 connection should be set to a static IP address so that the DJ s computer can always connect to the same address in order to modify the text messages If this address were auto configured via DHCP a change in routers or DHCP servers or resetting the router DHCP server to factory defaults would make it so the DRM Content Server Ethernet 1 connection would have a different IP address than before Then one would have to find out what that new address is and make the DJ s computer connect to that address instead Using DHCP not recommended the computer would attempt to get an IP address for that port automatically It would send a broadcast packet on that Ethernet connection and listen for a DHCP server a router or other computer on the network configured for this purpose to respond with an IP address for it to use The DHCP server would also provide information on how to reach the Internet In general DHCP servers typically operate by assigning IP addresses to requesting computer by picking as yet unassigned addr
90. nector on bracket of RME card Breakout cable unchecked any channel Pref Sync Ref ADAT In eal Sane In 9 slider up on A1 2 F Optical cable TOSLINK to upper most nS Puc In 10 slider up on A1 2 SPDIF optical AEB checked j optical connector on bracket of RME card A1 out slider up Breakout cable unchecked A2 out slider u Pref Sync Ref ADAT In P ae ee ioe In 9 slider up on A1 2 gt 9 pin w 2 RCA amp 2 Coax cable to white phono socket on emt In 10 slider up on A1 2 SPDIF coaxial AEB checked 3 XLR upper D socket breakout cable A1 out slider up Breakout cable unchecked A2 out slider u Pref Sync Ref ADAT In P Sa T lider up on A1 2 9 pin w 2 RCA amp 2 Balanced cable to female XLR on breakout S ider up on A1 2 AES EBY XLR upper D socket cable REE checked slider u PP Breakout cable checked slider H Pref Sync Ref ADAT In P e Pee In 11 slider up on A1 2 15 pin w 4 phono Unbalanced stereo cables to Line IN L and eeso In 12 slider up on A1 2 Analog unbalanced Breakout cable un checked lower D socket LINE IN R phono sockets A1 out slider up Pref Sync Ref ADAT In A2 out slider up 15 pin w 4 XLR lower D socket Analog balanced Balanced stereo cables to Line IN L and Line IN R XLR female sockets Sample 48 0 kHz AEB checked Breakout cable checked Pref Sync Ref ADAT In Input Level 4 dBu In 11 In 12 A1 ou ider up on A1 2 ider up on A
91. ng Ratio 100 vj 100 none PhaseCorr 80 80 70 60 50 30 20 1 saat 3 Q Check For Data Clear Terminal Figure 3 16 MCI Special menu The DRM Modulator and MCI are capable of saving the settings to the flash if the firmware version is greater than 1 00 Check the firmware version by selecting Special gt Firmware Version from the MCI menu The settings are saved with the Special gt Save Parameters option in the MCI menu Version 1 02 has 75 settings saving slots Ethernet parameters are now saved along with the rest of the settings So the following parameters can be saved to the flash DAC Delay DAC Bias DDS Scale e Clip ratio Amplitude Gain MAC address IP address 3 16 07 888 2001 895 3 53 WARNING Disconnect primary power prior to servicing Section 3 Operation UDP port number Transmitter ID IPM correction coefficients Frequency is also saved but the switches on the board dictate what frequency the modulator broadcasts on when it boots At power on or boot time frequency is read from the switches on the board and is matched if possible with a set of settings from the flash that were saved at that frequency If you use up all of the slots you will need to reload the firmware in that boot slot in order to be able to save settings again For this reason you should only issue the command when you are sure you have settings you want to keep for a
92. nt to C1 on the schematic or 2 gives added information or further explanation i e Used for 208V operation only or Used for HT 10LS only etc Inside the individual tables some standard conventions are used A symbol in front of a component such as C001 under the REF SYMBOLS EXPLANATIONS col umn means that this item is used on or with C001 and is not the actual part number for C001 In the ten digit part numbers if the last three numbers are 000 the item is a part that Harris has pur chased and has not manufactured or modified If the last three numbers are other than 000 the item is either manufactured by Harris or is purchased from a vendor and modified for use in the Harris product The first three digits of the ten DIGIT part number tell which family the part number belongs to for example all electrolytic can capacitors will be in the same family 524 xxxx 000 If an electrolytic can capacitor is found to have a 9xx xxxx xxx part number a number outside of the normal family of numbers it has probably been modified in some manner at the Harris factory and will therefore show up farther down into the individual parts list because each table is normally sorted in ascending order Most Harris made or modified assemblies will have 9xx xxxx xxx numbers associated with them The term SEE HIGHER LEVEL BILL in the description column implies that the reference designated part number will show up in a b
93. o ON when an IBOC audio is connected to the Alternate Audio Input 8 EXT_RF_EN Will Monitor the Transmitter EXT RF CARRIER Status J7 11 If status is removed the Digital Interface will switch to the Local Audio Input 9 MULTI_SW_EN In the event of a failure of the DRM Exciter the Digital Interface will switch to an alternate Audio Input When the DRM Exciter fault is no longer present the Digital interface will switch back to DRM Mode 10 PEAK _DETECTOR_EN This feature enables the circuit to look at the Audio Output and if No audio is present for a user specified time as set by dipswitch 1 amp 2 the Digital Interface will switch to the Next Audio Source 3 16 07 888 2001 895 2 23 WARNING Disconnect primary power prior to servicing Sec tion 2 Installation Table 2 4 Jumper Settings 2 24 Jumper Position Description JP16 1 2 Audio to Channel 1 on DRM Exciter JP17 1 2 Audio to Channel 2 on DRM Exciter JP3 JP5 1 2 Local Audio Input set to 600 ohm termination JP13 1 2 Local Audio Input Audio DC Coupled JP10 JP4 JP6 1 2 Alternate Audio Input 600 ohm termination JP 14 1 2 Alternate Audio Input Audio DC Coupled JP11 JP8 1 2 External Volts required on J7 24 for pull ups on J7 Outputs JP12 1 2 External Volts required for Common side of opto isolators for J7 inputs JP1 1 2 VDC to activate J7 12 Ext_In1 JP2 1 2 VDC ground to A
94. o you 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Section 2 Installation Use an address in a private LAN IP block These blocks are as follows 10 x y z 192 168 y z 172 16 y z through 172 31 y z The x and y numbers shown above can have the values 0 through 255 IP addresses cannot end in 255 or 0 In the blocks shown above this means z can only have the values 1 through 254 2 3 2 2 3 GUI Ethernet Setup When configuring your Ethernet interfaces within the DRM Content Server software please keep in mind that the Ethernet 0 port also called eth0 can only be configured to output DRM MDI data to the DRM Modulator If you are using Ethernet MDI instead of serial cable and you wish to be able to update DRM text messages remotely use Ethernet 1 eth1 for that access Once you start the system network configuration tool you will see something like the following Your actual screen may differ depending on system configuration 888 2001 895 2 13 WARNING Disconnect primary power prior to servicing Section 2 Installation v EETA EG File Profile Help f E New Edit Copy Delete 2 Activate Deactivate Devices Hardware IPsec DNS Hosts NIE You may configure network devices associated with F5 oh associated with a single piece of hardware Active ethO eth0 Ethernet y amp Inactive eS oki ethl Ethernet p
95. oltage on the power supply The monitor keyboard and mouse are normally user supplied 888 2001 895 2 1 WARNING Disconnect primary power prior to servicing Section 2 Installation 2 2 2 3 1 1 Case Refer to the separate manufacturer s user s manual for details on the rack mount case which details both the physical assembly and the fan control and monitor circuitry The case front door maybe locked with the keys included with the manual 2 3 1 2 Power Supply The power supply is heavy duty and switchable between 120 and 240 volts The input voltage selector and full power switch are located on the back of the supply below the line power cord The power switch mounted on the front of the chassis next to the hard disk array is a hot power switch and does not protect the power supply from over voltage gt NOTE Do not plug the unit in until you have confirmed that the supply is configured for your voltage To check this you will need to open the case and remove the power cord from the back of the supply to gain access to the voltage switch Once you have the supply configured correctly be sure the power switch mounted on the supply is in the on position then reconnect the power cord and replace the cover on the case The power switch mounted on the front of the chassis is a hot power switch and does not protect the power supply from over voltage Normal power on requires simply depressing and releasing the fr
96. on HMMix uses Hierarchical Modulation for the TI axis of its QAM constellation diagram but Standard Modulation for the other axis HMSym and HMMix capability in the Content Server are still under development For short distance transmissions use an MSC Mode of 64 QAM SM and an SDC Mode of 16 QAM For long distances or to demonstrate long distance capability use an MSC Mode of 16 QAM SM and an SDC Mode of 4 QAM The QAM mode of the SDC is one level lower than that of the MSC since it must be received correctly in order to start decoding of the MSC Parts A and B Steam Streami Stream2 Stream3 Total Actual a More Protected Part A b s b s b 4 b 4 a E 0 0 6 Maximum 071 UIONE Available A Less Protected Part B lizss b 4 b b 4 g l 0 6 Fill To Maximum O weak see i 2 na Your encoded audio can be divided into a higher protected part and a lower protected part The audio encoder places more critical information about the audio at the beginning of each frame The DRM Modulator can encode the first higher protected 3 16 07 888 2001 895 3 21 WARNING Disconnect primary power prior to servicing Section 3 Operation part at a more error proof lower throughput rate than it does the lower protected part So after the different parts leave the audio encoder and it has placed its most valuable data in the higher protected part the Modulator encodes the parts differently You can specify how many bytes in each 0 4 second
97. ont panel switch Power down should be carried out through the operating system but may be started by depressing releasing the front panel switch 2 3 1 3 Motherboard Refer to the separate manufacturer s user s manual for details on the computer motherboard 2 3 1 4 Hard Disk Array For superb reliability the DRM CSB 100 incorporates a RAID 1 mirrored disk array using two identical hard disk drives in a hot swappable caddy Refer to the separate manufacturer s user s manual for details on the hard disk array including the replacement procedure in case of hard disk failure 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Section 2 Installation 2 3 1 5 Auxiliary Drives The DRM CSB 100 contains a DVD ROM and floppy drive for software installation and file transfer 2 3 1 6 Sound Card The DRM CSB 100 utilizes the RME HDSP 9632 professional sound card This is a versatile multi input device mounted in one of the computer PCI slots Refer to the separate manufacturer s user s manual for details on the sound card itself Please refer to the external connections and operations portions of the manual for utilization of this card in your DRM application 2 3 1 7 Software Key Mounted inside the DRM CSB 100 chassis is a USB software license key that enables the DRM Content Server software to operate If during operation the software indicates the key is missing check to
98. ontent Servers and Modulators In this configuration the DRM Content Server must be located near the DRM Modulator so that serial cables can be connected between them You may want to use this method temporarily during system setup even if you want to eventually be able to locate your Content Server remotely Connect the D9 connectors found on the back panel of both units as labeled CS Interface to CS Interface and MCI Interface to MCI Interface with the included serial cables Transmitter site Content Modulator Cae via serial MCT Setup STL audio of local studio 888 2001 895 2 5 WARNING Disconnect primary power prior to servicing Section 2 Installation 2 6 2 3 2 2 2 Ethernet Connections With the addition of Ethernet capability firmware version 1 02 and above the DRM Content Server can be located remotely Ethernet replaces the serial link between the Content Server computer and the DRM Modulator This allows the link to be much longer for example over a dedicated ISDN line contact your local telephone service provider to check the availability of dedicated lines in your area or other Ethernet link This configuration allows easier access to monitor the Content Server and change its DRM encoding settings service labels and text messages at the studio site Studio site Transmitter site DRM DRM Content ee data Modulator Server via Ethernet MCT Setup MCT laptop studio output f tempo
99. or the installation and or the use of the complete system composed of The DRM MOD 1000 modulator The transmitter in which it is installed The transmitting antenna The connections between these equipments are fully responsible for EMF requirements of the system according to relevant standards and Council Recommendation 1999 519 EC of 12 July 1999 on the limitation of exposure of the general public to electromagnetic fields 0Hz to 300 GHz 2 4 1 Placement The DRM MOD 100 consists of a single 2U chassis that should be installed in a rack adjacent to the transmitter together with the DRM CSB 100 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing m 2 c c G Oo c e 2 2 va 3 16 07 Section 2 Installation 2 4 2 System Components Following is a brief description of the DRM MOD 100 system hardware components 2 4 2 1 Exciter Card The exciter card is the heart of the DRM system generating the COFDM modulated RF and amplitude signals with the multiplexed data generated in the DRM CSB 100 content server Following is a simplified block diagram of the exciter card oT Linear rl Reset Power Supply Supply Watchdog 16 Data Envelope modulation Amplitude Output RF Output Primary DSP 24 576 MHz Serial Port 61 44 MHz RF Sample 2 Secondary Digital DSP Analog Audio Input Figure 2 7 DRM MOD 100 exciter card block
100. phono socket on nanoa In 10 slider up on A1 2 SPDIF coaxial AEB checked XLR upper D socket breakout cable A1 out slider up Breakout cable unchecked A2 out slider u Pref Sync Ref ADAT In P Sepe ee In 9 slider up on A1 2 9 pinw 2 RCA amp 2 Balanced cable to female XLR on breakout a In 10 slider up on A1 2 AES EBU AEB checked i XLR upper D socket cable A1 out slider up Breakout cable checked A2 out slider up In 11 slider up on A1 2 In 12 slider up on A1 2 A1 out slider up A2 out slider up Analog balanced 3 2 7 1 15 pin w 4 XLR lower D socket Balanced stereo cables to Line IN L and Line IN R XLR female sockets Sample 48 0 kHz AEB checked Breakout cable checked Pref Sync Ref ADAT In Input Level 4 dBu Audio Configuration Settings In 11 slider up on A1 2 In 12 slider up on A1 2 A1 out slider up A2 out slider up To adjust the configuration settings described in the fourth column of table 3 1 select an unused desktop and click on the HDSPConf icon The following window will appear 3 4 888 2001 895 WARNING Disconnect primary power prior to servicing 3 16 07 3 16 07 Section 3 Operation r W Hammerfall DSP Alsa Settings x Card 1 HDSP9632 About Sample Clock Source SPDIF In AEB Breakout Cable AutoSync Optical W Adatl Int F XLR 32 0 kHz Coaxial Pref Sync Ref Input Le
101. pply All button is selected 9 As indicated by the background waveform in the window sliders to the left affect the phase near the RF minimum and those to the right near the max imum Those at the extreme right correspond to amplitudes above the peak of the test signal and should be set to the same value as the last one that affects the measured phase 10 If a modulation analyzer is not available a more tedious method is to adjust the phase compensation to minimize the amplitude of the phase modulation products at 1500 Hz from the carrier frequency 4 DRM Modulator Control Interface MCI Be File Special Help Terminal Modulator ID ClockMult 1 DRM Test AmpGain 100 Ok Set ID Mode 22 Ok Initialization hogy 1250000 Mode 22 98 AM 750 Hz v ClockMult 1 Frequency 1250000 lHz Ok PhaseCorr 2000000000001 honan le PhaseCor 1000000000004 amplitude Gain no x PhaseCorr 1025000000000 Adjustment PhaseCorr 10 25 350000000 DAC Delay 5 28 usec PhaseCorr 10 25 35 4000000 _ Adjust PhaseCorr 10 25 35 40400000 DAC Bias 720 sy mV 1500 0 IPhaseCorr 10 25 35 40 40 35 35 3 7 Clipping Ratio 100 a COA none PhaseCorr 80 80 70 60 50 30 201 gt i Q Check For Data amp Clear Terminal PhaseCorr 10 25 35 40 40 3500 g amp Read All Figure 3 15 MCI main window after Phase Correction window closed 11 After adjusting and
102. ptions Mo VUMeter l Timing l Clocktime M Show Diagnostics DF S0 Service Label l E m I The Timing check box enables and disables the display of timing information from the Content Server Leave this box unchecked The Clock time check box enables and disables the display of the computer clock time on the output It is also typical to leave this box unchecked If you check the VU Meter check box and press Send you will see the audio level displayed in the Content Server window You can check the audio level entering your DRM Content Server software audio encoder It is important that you do this if you are using a live audio source 888 2001 895 3 29 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 30 ba Shell DRM CS amp GUI Session Edit View Bookmarks Settings Help Harris DRM CSB 100 Content Server c 2003 2004 2005 by WRMF Inc version 3 1 21 Portions SBR c Coding Technologies AAC c Fraunhoffer Institut fur Integrierte Schaltungen IIS CELP c NEC Corporation HVXC c SONY Corporation home drm drm DRM ini file changed home drm drm StreamOTextMessage txt file changed Left FARRAR RRRRRR ARES 5 dB Right PRRRRRRRRRRRRR 7 dBi Figure 3 3 VU Meter output in Content Server window when VU Meter is enabled You will see asterisks in the Content Server output window indicating the audio level To the right of the asterisks you will see negative n
103. r on the DRM Modulator Exciter board will flash continuously They are labeled DL2 and DL3 4 DRM Modulator Control Interface MCI File Special Help Terminal ClockMult 1 AmpGain 100 Fae 1250000 Ok ClockMult 1 Ok AmpGain 100 DACDelay 10 56 DACBias 1250 ClippingRatio 100 Ok DACDelay 10 56 Ok DACBias 1250 Ok ClippingRatio 1000 a 6 amp Ll ie Modulator ID r Mode 22 98 AM 750 Hz Sa Frequency ae lt Hz Amplitude Gain 100 Adjustment a DAC Delay 10 56 usec mV 1500 0 DAC Bias 1250 ig Clipping Ratio 100 100 none Q ReadAl All x Phase Corr Q Check For Data amp Clear Terminal Figure 3 6 After pressing Initialize and Adjust to send initial settings to Modulator On the Modulator Control Interface PC click the Initialize button that is next to the mode selection window Click Adjust button as well If the system is in communication these parameters should be visible on the screen 3 16 07 888 2001 895 3 37 WARNING Disconnect primary power prior to servicing Section 3 Operation 4 DRM Modulator Control Interface MCI Be File Special Help Terminal Modulator ID Ok DRM Test ClippingRatio 100 ID DRM Test Set ID Mode 22 Freq 1250000 Initialization ClockMult 1 Mode 22 98 AM 750 Hz v DACDelay 10 56 ClippingRatio 100 Frequenc
104. r to servicing 3 25 Section 3 Operation 50 Service Identifier 11193046 2 The Service Identifier is an integer field It should be used to uniquely identify the service For example your Spanish and English language audio services would have different service IDs 0 Service Descriptor No program type Other music News Weather Current affairs Finance Information Childrens Sport Social affairs Education Religion Drama Phone in Culture Travel Science Leisure Varied Jazz music Pop music Country music Rock music National music Easy listenina Oldies music Liaht classical Folk music Serious classical Documentary 3 The Service Descriptor group of radio buttons lets the user specify the type of programming present This information will usually be shown on the display of a DRM receiver Thirty program types are available SO Language None specified Arabic Bengali Chinese Mand Dutch English French German Hindi Japanese Javanese Korean Portugese Russian Spanish Other lanq 4 The Language radio button group allows you to specify which language you use to broadcast the service This is also often displayed on receivers You can set the Language to No language specified Other Language or one of the fourteen listed languages The DRM standard also allows for three character country of origin codes but the DRM Content Server software does not offer that feature The DRM Specification Section 6 3
105. r uses SM short for Standard Modulation It exists in a better audio quality version where you specify that your SDC is 16 QAM and your MSC is 64 QAM and a lower audio quality version that gives better weak signal reception with the SDC in 4 QAM and the MSC in 16 QAM Your receiver software is capable of displaying the received QAM signal as graph called a constellation diagram From the perspective of the exciter the bits that will be sent specify a point in the diagram For a 64 QAM constellation there are 64 possible points that the bits can specify For 16 QAM there are only 16 So one carrier from a 64 QAM constellation at a specific moment carries more information than one at 16 QAM For details on how bits become constellation diagram points see DRM Specification Section 7 4 A receiver on the other hand given a carrier at a given moment seeks to determine which of the 16 or 64 possible constellation points the carrier is closest to When there are only 16 points even if the transmission has been affected by noise long distance transmission it is more likely to be closest to the correct constellation point There are intermediate transmission configurations which attempt to bolster 64 QAM with additional error correction These two configurations are called 64 QAM HMSym and 64 QAM HMMix HMSym and HMMix are not available at 16 QAM HMSym is called what it is because it uses Hierarchical Modulation as opposed to SM or Standard Modulati
106. rary audio source for setup gt NOTE One must still connect directly to the DRM Modulator MCI serial port with a serial cable in order to use the MCI application for programming the MCI is used to change adjustment parameters like DAC Delay DAC Bias Test Modes etc You can setup your DRM Modulator with a laptop at the transmitter site using a Windows version of the MCI If you have trouble using the MCI program on your particular laptop you could bring the DRM Content Server to the Transmitter site and use the MCI that is installed on it for programming until you are satis fied with your changes then return the Content Server to your studio The DRM Content Server has two Ethernet ports labeled Ethernet 0 and Ethernet 1 See below for descriptions and configuration options Ethernet 0 is intended to be set to a static unchanging IP address on a network and will be used exclusively as a dedicated connection to send MDI data to the DRM Modulator This can be done via a crossover cable a normal Ethernet cable with either a hub or switch a dedicated line or other Ethernet link Ethernet 1 can be used for the link from the studio and for connection to the internet 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Section 2 Installation Ethernet Port 0 connection configurations are summarized below 1 Crossover Cable Use the crossover cable optio
107. rds must be observed The following National Fire Protection Association NFPA standards are recommended as reference Automatic Fire Detectors No 72E Installation Maintenance and Use of Portable Fire Extinguishers No 10 Halogenated Fire Extinguishing Agent Systems No 12A A WARNING ALWAYS DISCONNECT POWER BEFORE OPENING COVERS DOORS ENCLO SURES GATES PANELS OR SHIELDS ALWAYS USE GROUNDING STICKS AND SHORT OUT HIGH VOLTAGE POINTS BEFORE SERVICING NEVER MAKE INTERNAL ADJUSTMENTS PERFORM MAINTENANCE OR SERVICE WHEN ALONE OR WHEN FATIGUED Do not remove short circuit or tamper with interlock switches on access covers doors enclosures gates panels or shields Keep away from live circuits know your equipment and don t take chances A WARNING IN CASE OF EMERGENCY ENSURE THAT POWER HAS BEEN DISCONNECTED A WARNING IF OIL FILLED OR ELECTROLYTIC CAPACITORS ARE UTILIZED IN YOUR EQUIPMENT AND IF A LEAK OR BULGE IS APPARENT ON THE CAPACITOR CASE WHEN THE UNIT IS OPENED FOR SERVICE OR MAINTENANCE ALLOW THE UNIT TO COOL DOWN BEFORE ATTEMPTING TO REMOVE THE DEFEC TIVE CAPACITOR DO NOT ATTEMPT TO SERVICE A DEFECTIVE CAPACITOR WHILE IT IS HOT DUE TO THE POSSIBILITY OF A CASE RUPTURE AND SUBSE QUENT INJURY 3 16 07 888 2001 895 ix WARNING Disconnect primary power prior to servicing TREATMENT OF ELECTRICAL SHOCK 1 IF VICTIM IS NOT RESPONSIVE FOLLOW THE A B CS OF BASIC LIFE SUPPORT PLACE VICTIM FLAT ON HIS
108. reliminary Setup Power and Bias 3 39 MCI Interface ene tse LLL LLL LLL 2 22 OptiMiIZatION 4 ose i a E E E ean aus 3 42 Pre power Up Procedures o aoo oonan 2 22 Network SetOngs inc scect oid ed gun mert aemtaen 3 47 Setting power supply voltage 2 22 GPS Status eae ER ae ing We Aen aan eas aaa 3 49 Default frequency setting 2 22 Resolving GPS problems 3 51 Interface dipswitch jumper and pot settings pena 222 Saving MCI Settings rt EE E O S E E E ig Nena Ne 3 53 Digital Interface LED Indications 3 56 Section 3 Operation ew DRM CSB 100 operation 04 3 1 ection Powering Up 02 cece eee eee eee 3 1 888 2001 895 1 WARNING Disconnect primary power prior to servicing Table of Contents Theory Obtaining the ETSI Specification 4 1 From Audio to DRM Exciter Board Input 4 1 Interference types and solutions 4 1 Multipath radio wave propagation 4 2 Side frequencies siones marn ie chee eee eee 4 2 Receiving in the same phase that was transmitted 4 4 Getting the signal ready for the transmitter 4 4 Changing frequency 0 0 008 4 4 AMpPlEYING ore enana EA AR E AAPAN lenges 4 4 DRM MOD 100 Operation 4 6 DRM INTER oii cg iccse gag bette eie a dp dienes 4 7 DRM RST ia dateteh een TE aE tae be ws 4 7 DRM WDOG ii boson ie l
109. rface will make a switch to a different Audio Source to the Transmitter 4 4 5 DRMMDI_OK This signal represent the MDI data between the Content Server and the DRM Exciter It changes pulse widths depending on the Mode that is selected by the MCI Software The Digital interface has an internal Timer that counts from 0 to 2 seconds The MDI_OK input resets this timer If the timer reaches 2 seconds then the MDI Status LED on the Front panel Remote Status will be disabled 4 4 6 DRMMODE_0 MODE _1 MODE 2 This is a 3 Bit combination from the DRM Exciter to tell the Digital Interface what mode it is in For example when MODE_0 is low this represents that the DRM Exciter is in DRM Mode When it is High this represents the DRM Exciter is in AM MODE This signal tells the Digital interface that is needs to switch to a different Audio Source for AM MODE In AM Mode the Transmitter uses the RF signal from the DRM Exciter but uses the AUDIO from the Local Audio Input on the Rear of the Assembly 888 2001 895 4 7 WARNING Disconnect primary power prior to servicing Section 4 Theory 4 8 4 4 7 DRM SP1 Spare input not used at this time 4 4 8 DRM EXT_MODE This is an Input to the DRM Exciter to tell it what mode to go in If the Front panel Bypass mode is selected then a Low signal will be sent to the DRM Exciter telling it to go to AM MODE This signal will also go Low when in the Alternate Audio Mode 888 2001 895 3 16 07 WARNING D
110. s modes of operation the DRM CSB 100 Content Server Multiplexer provides audio encoding including station ID and language identifiers and program format messaging By designing the DRM CSB 100 to work seamlessly with the MOD 100 Modulator and the DX series transmitter Harris engineers have created powerful out of the box features and benefits for the digital radio broadcaster gt Broad DRM Programming Capability The DRM CSB 100 offers a full complement of transmission settings required for DRM broadcasting The DRM CSB 100 Content Server Multiplexer offers basic DRM operation with a single audio feed and program associated data allowing a low cost solution to start DRM transmissions As receivers and DRM capability develops and a full featured content server is added at the studio the DRM CSB continues to function as a transmitter server for maximum flexibility and control at your transmitter site See full listing of DRM settings under Specifications section on the back of this sheet gt Flexible Installation Located at the transmitter site for direct RS232 connection or located remotely at the studio via Ethernet the DRM CSB 100 Content Server Multiplexer is designed for flexible integration into your broadcast production environment gt Full Encoding Capability The DRM CSB 100 includes AAC Plus with SBR audio encoding CELP and HVXC encoding is optional gt Stable Reliable Operating Software The Harris DRM CSB 100 Conten
111. sed to find that these systems were very sensitive to multipath fading when unusual weather conditions caused tropospheric ducting because one symbol interfered with those following Low data rate digital signals are resistant to multipath if the guard time between symbols is greater than the delay spread of the signals arriving at the receiver but transmission of kilobits per second requires distributing the data among a rather large number of low data rate carriers 4 3 2 Side frequencies This introduces another problem Most forms of digital modulation produce many side frequencies for each carrier so that if multiple carriers are closely spaced they interfere with each other The solution for this problem is Orthogonal Frequency Division Multiplex OFDM The sidebands of a carrier amplitude or phase modulated with a square pulse form a spectrum whose amplitude varies as A sin x x where x P t in radians and t is the duration of the pulse 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Section 4 Theory This familiar function has a maximum at the unmodulated carrier frequency and nulls zero values spaced at frequencies f n t Hz where n 1 2 3 Thus multiple carriers spaced 1 t Hz apart are free of intercarrier interference One of the first practical applications of OFDM was the 1955 Collins Kineplex multi channel teletype system It placed 12 300 baud QPSK TTY space
112. stness SDC Mode f Interleaver Depth A5 Guard Interval Local Medium Wave 16 QAM__ 4 QAM eo see 04sec MSC Mode r Spectrum Occupancy B 20 Guard Interval General Sky Wave o 64 QAM no hier SM C AS5kHz 10kHz C 27 Guard Interval Severe Multipath C 64 QAM hier on HMmix c 64 QAM hier Q HMsym ae Cae D 44 Guard Interval Severe Multipath Doppler C 16 QAM no hier SM C 9 kHz 20kHz E d Part A Stream0O Streami Stream2 Stream3 Total Actual rot Level For More Protected Part az a al 4 F 0 5 strong 0 0 0 0 0 0 C 06 Maximum EOT r T en Available rot Level For Less Protected Part C 0 5 strong i738 fo fo lo 1738 1738 C 0 6 Fill To Maximum r Base Enhancement gt C O74 eO A Co 3 base layer 0 78 weak enhancement layer AMIDRM Modes Pure DRM AM by External Modulation AM Synthesized in DRM Exciter Simulcast DRM Above AM Simulcast DRM Below AM Simulcast DRMs Above amp Below AM Show V C Simulcast One DRM Split Around AM Possible bits in MSC 13908 1738 bytes The Transmission tab of the GUI allows the user to set DRM and AM parameters that apply to the whole transmission 3 3 2 4 1 DRM options Spectrum Occupancy Spectrum Occupancy 5 4 5kHz 10kHz 5 kHz 18kHz 9 kHz 20kHz The most basic option which you can set is Spectrum Occupancy It is described in Section 8 3 1 of th
113. t the buffered input would eventually perhaps 888 2001 895 4 9 WARNING Disconnect primary power prior to servicing Section 4 Theory in several weeks or months be consumed and 2 seconds of audio would be repeated once on the air If it operated too slowly 1 2 seconds of audio would be skipped 4 10 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing HARRIS DRM MOD 100 Modulator DRM MOD 100 e Modulator for DRM e D r m Harris DRM The future of radio technology starts here The DRM MOD 100 Modulator offers world class plug and play DRM capability for DX 3DX and DAX transmitters What could be easier The Harris DRM MOD 100 Modulator must have known its own destiny Designed from its inception to work seamlessly with the rugged and reliable Harris digital ready DX 3DX and DAX lines of transmitters the DRM MOD 100 offers easy installation rapid set up and full DRM functionality Integrated with the DX 3DX and DAX transmitter series and our DRM CSB 100 Content Server the DRM MOD 100 Modulator is a key element in Harris industry leading DRM solution which has been designed to provide broadcasters simplicity flexibility upgradeability and value The DRM MOD 100 Modulator integrates with the legendary line of Harris DX transmitters from the DX10 to the DX2000 By planning the design architecture of the DRM MOD 100 Modulator with the DX transmitter in mind Harris engineers cre
114. t Server Multiplexer is built on the Linux Operating System for proven stability and up time from the studio or at the transmitter site gt Convenient Dual Mode Control The DRM CSB 100 Content Server Multiplexer allows transmitter mode control for analog or DRM operation gt Hardware Built to Last The DRM CSB 100 is configured on a two rack unit PC with professional audio inputs and a rugged field tested chassis Requires optional monitor keyboard and mouse for operation Content Server Specifications DRM CSB 100 Parameter Specification Notes Serial port data rate 38 4Kbaud Number of serial ports 1 SDC types 0 amp 9 AFS index not implemented Robustness modes Modes A B C amp D User Interface GUI Services 1 Audio only Data input RT audio Configuration control Local Output format Per MDI standard MDI standard on RS232 Protection Levels 4 DRM CSB 100 Content Server Specifications Content Server Product Current Future Content Server Product Current Future DRM CSB 100 Features Software DRM CSB 100 Features Software Upgrade Upgrade Audio Encoding Configurations Transmission Configurations Type of Audio Encoding Robustness Mode MPEG 4 e Modes A B C and D SBR e Spectrum Occupancy Non SBR s 4 5 kHz 5 kHz 9 kHz and 10 kHz CELP Modes A B C and D J HVXC 18 kHz Audio Sampling Rates Mode A e 8 kHz J Modes B C and D J 12 kHz e 20 kHz 16 kHz J Modes A and B 24 kHz Modes C and D e Stereo Mono QAM Mo
115. tabs labeled Service 1 Service 2 and Service 3 50 Stream Id O 8 The Stream ID radio buttons select the mapping between DRM Services and DRM Streams Leave Service 0 in Stream 0 Service 1 in Stream 1 etc 3 3 2 5 1 Audio parameters 50 Audio Coding MPEG AAC CELER HYXC 1 The Audio Coding group of radio buttons is designed to allow the user to choose between different audio coding algorithms The choices are MPEG AAC CELP and HVXC The DRM Content Server is capable of transmitting only in MPEG AAC M SO SBR Flag 2 The SBR flag is checked by default SBR or Spectral Band Replication allows high audio frequencies to be recreated with sophisticated algorithms in the receiver The DRM signal will sound best at the receiver when SBR is turned on Fraunhofer originally created MPEG 4 AAC Coding Technologies created the SBR extension to MPEG AAC 888 2001 895 3 27 WARNING Disconnect primary power prior to servicing Section 3 Operation ee r SO Audio Mode mono param stereo stereo 3 The Audio Mode group of radio buttons lets the user change whether the system is broadcasting in stereo parametric stereo or mono Parametric stereo is not as good as stereo It encodes the low frequencies for the left and right channels together The high frequency sounds are encoded separately This is because the human ear is not as directional for low frequencies All three modes are enabled in this system 0 Au
116. th GPS time in order to begin broadcasting that DRM data at precisely the same moment as all of the other DRM Modulators in the Single Frequency Network This requires 10 seconds of buffering DRM MDI data in the DRM Modulator and is not implemented on this version of the DRM Modulator When the DRM Modulator is first turned on the GPS receiver module will take up to 200 seconds typically to get a good fix on GPS satellites You can query the GPS status by using the Special GPS Status menu entry in the MCI 888 2001 895 3 49 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 50 vE MCD Bek Term Firmware Version E Modulator ID IDRM I4 Firmware Checksum erste Psa F Network Settings Initialization Mode 00 normal DRM mode nll Frequency 1000000 S Hz G Save Parameters B Load Firmware Amplitude Gain 100 am Adjustment DAC Delay 0 00 usec ee Adjust DAC Bias 0 ie mV 1500 0 Clipping Ratio 80 100 none ee Q Check For Data amp Clear Terminal An example output during normal operation could appear as follows GPS Status Antenna Status Antenna OK normal GPS Status Receiver Status 3D Fix normal operation GPS Status Visible GPS Satellites 5 12 is normal 9 GPS Status Tracked GPS Satellites 5 12 is normal 9 You may notice that when you first turn on the Modulator the number of satellit
117. therwise always keep this option disabled 3 32 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 3 3 Text Messages HARRIS DRM CSB 100 Content Server v M VUMeter T Timing F Clocktime M Show Diagnostics Configuration Transmission SO Service Label Haris Broadcast SO Service Identifier 11193046 F CA System Used SO Language None specified Arabic C Bengali Chinese Mand C Dutch English C French German Hindi Japanese C Javanese C Korean C Portugese Russian C Spanish Other lang r SO Stream Id 0 Ci C Easy listening Light classical C2 3 0 Audio Data Audio Data Unused T S50 Service Descriptor _ No program type Other music C News Weather C Current affairs Finance Information Childrens Sport Social affairs C Education Reliaion C Drama C Phone in Culture Travel Science Leisure Varied Jazz music C Pop music Country music Rock music National music _ Oldies music S l lt Folk music Serious classical Documentary Section 3 Operation Service 1 Service 2 Service 3 output About r SO Audio Coding gt MPEG AAC C CEIR HVXC M SO SBR Flag r SO Audio Mode mono param stereo C stereo r 0 Audio Samplin 8kHz pig 12kHz C 46 kHz 24 kHz to AM Send S0 So
118. tion C AM Synthesized in DRM Exciter Simulcast DRM Above AM C Simulcast DRM Below AM C Simulcast DRMs Above amp Below AM Show V C Simulcast One DRM Split Around AM ossible bits in MSC 13908 1738 bytes This screen lets you choose from the different settings that are part of the DRM system From this screen you can select the Service 0 tab 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing V Show Diagnostics SO Service Label Harris Broadcast SO Service Identifier 11193046 l CA System Used 50 Language None specified Arabic C Bengali Chinese Mand C Dutch English C French German Hindi Japanese Javanese Korean Portugese Russian Spanish Other lanq Confiquration Transmission r 50 Stream Id e l 2 3 r SO Audio Data 5 lt Audio Data Unused SO Service Descriptor No program type Other music C News C Weather C Current affairs C Finance Information _ Childrens Sport Social affairs C Education Reliaion Drama _ Phone in Culture Travel C Science _ Leisure Varied Jazz music C Pop music Country music Rock music _ National music C Easy listening _ Oldies music Light classical _ Fok music Serious classical Documentary Section 3 Operation v O Xx M VUMeter P H S to AM Send DRM CSB 100 Content Server Service 1 Service 2 Ser
119. ty for use only as a part of a DRM radio transmitter The DRM MOD 100 alone does not limit spurious emissions as required by EN 302 245 2 When the DRM MOD 100 is installed in a transmitter The transmitter must be provided with any filtering needed to cause the transmitter output spurious emissions to be lower than the limit set by EN 302 245 2 A Technical Construction File of tests and observations to verify compliance is filed as QCY 2006 02 dated July 28 2006 The Technical Construction File was prepared by Kerk Zz March 12 2007 Karl Black Compliance Engineer Date Based on the above tests and inspections we hereby declare this equipment compliant cal March 14 2007 Geoff Mendenhall Date V P Engineering 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Guide to Using Harris Parts List Information The Harris Replaceable Parts List Index portrays a tree structure with the major items being leftmost in the index The example below shows the Transmitter as the highest item in the tree structure If you were to look at the bill of materials table for the Transmitter you would find the Control Cabinet the PA Cabinet and the Output Cabinet In the Replaceable Parts List Index the Control Cabinet PA Cabinet and Output Cabinet show up one indentation level below the Transmitter and implies that they are used in the Transmitter The Controller Board is indented one level below the Control Ca
120. umbers The closer these numbers approach zero and the more asterisks precede them the closer your audio is to being clipped 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 3 2 7 Output M VUMeter Pain HARRIS r e to AM Send Show Diagnostics DRM CSB 100 Content Server Configuration Transmission Service o Service 1 Service 2 Service 3 Output About MDI Output by Ethernet 10 2 3 103 10000 IP TCP UDP Selection JUDE TCP MDI Output to File l FF Enabled FF mdi Open ossible bits in MSC 15272 1909 bytes In order to use the Ethernet for the MDI connection between the Content Server and Modulator you need to have the following set up The Ethernet 0 connection must be active The Ethernet 0 connection must be connected properly to the DRM Modulator via a crossover cable or standard Ethernet cables and a hub switch or a leased line You must have the DRM Modulator set to a known IP address You can change the DRM Modulator s IP address using the MCI software and connecting to the Modula tor s MCI serial port The DRM Content Server should be able to access the DRM Modulator s IP address given its IP address and subnet mask For instance the default IP addresses used for Harris equipment are for the DRM Content Server to be configured to 10 2 2 x 3 16 07 888 2001 895 3 31 WARN
121. upports straps and packing materials prior to initial turn on Technical Assistance HARRIS Technical and Troubleshooting assistance is available from HARRIS Field Service during normal business hours 8 00 AM 5 00 PM Central Time Emergency service is available 24 hours a day Telephone 217 222 8200 to contact the Field Service Department or address correspondence to Field Service Department HARRIS Broadcast Communications Division P O Box 4290 Quincy Illinois 62305 4290 USA Technical Support by e mail tsupport harris com The HARRIS factory may also be contacted through a FAX facility 217 221 7096 Replaceable Parts Service Replacement parts are available 24 hours a day seven days a week from the HARRIS Service Parts Department Telephone 217 222 8200 to contact the service parts department or address correspondence to Service Parts Department HARRIS CORPORATION Broadcast Systems Division P O Box 4290 Quincy Illinois 62305 4290 USA The HARRIS factory may also be contacted through a FAX facility 217 221 7096 gt NOTE The symbol used in the parts list means used with e g C001 used with C001 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Manual Revision History 888 2001 895 Technical Manual REV DATE ECN Pages Affected Preliminary 12dec2005 A 5jan2006 P31528 Released Al 16mar2007 Added CE info 3 16 07 888 2001 895 MRH 1 WARN
122. urce PRBS test aac file _ wa file live audio r 50 Text Flag l 50 Enhancement Flag ossible bits in MSC 13908 1738 bytes The Text Flag check box enables the transmission of text messages The Text Flag check box is in the Service 0 tab of the GUI T 0 Text Flag To change which text message is transmitted click on the notebook and pencil icon labeled DRM Text Message ke DRM Text Message 3 16 07 888 2001 895 WARNING Disconnect primary power prior to servicing 3 33 Section 3 Operation 3 34 A window will appear with a simple text editor allowing the user to edit the text message The file will be saved as home drm drm Stream0TextMessage txt d home drm drm StreamOT extMessage txt modified KEdit BEE File Edit Go Tools Settings Help s eUB e B DAK Sample text message INS Line 1 Col 20 When you save the file the new text message will begin to be transmitted by the DRM Content Server Longer text messages will take slightly longer to transmit Typically once an entire message has been transmitted it will appear on the display of the receiver It may remain on the receiver s display until a new text message is completely received Text messages can be 128 characters in length Most receivers display that message on 7 lines Each time you change the message and save it the CS will detect that change and begin transmitting the new messag
123. ut changes with Ext RF Carrier Selec CMD OUTPUT 3 Mute Out Active Low OUTPUT 4 Digital Analog Transmission Low Digital OUTPUT 5 MDI Fault OUTPUT 6 MODULATOR Fault OUTPUT 7 MDI Status Low OK OUTPUT 8 Bypass Mode Status Low Bypass Active OUTPUT 9 Alternate Mode Status Low Active 10 GROUND 11 Transmitter status of operating with External RF Carrier Input INPUT 12 Vdc to Enable DRM Mode INPUT 13 Ground to Enable Remote Bypass Mode INPUT 14 Ground to Enable Remote Normal Mode INPUT 15 Ground to Enable Remote Alternate Mode INPUT 16 Ground to Enable Ext Channel 4 INPUT 17 Ground to Enable Ext Channel 5 INPUT 18 Ground to Enable Ext Channel 6 INPUT 19 Ground to Enable Ext Channel 7 INPUT 20 LOCAL SWITCH COMMON 21 LOCAL SWITCH NC Normal Operation 22 LOCAL SWITCH NO Bypass Operation 23 J7_VCC Common on Inputs 24 J7 VCC Common on Outputs 25 NC 2 4 2 2 1 Content Server CS Connects to J3 Fiber Optic or Ethernet on the Rear of the Panel The Content Server converts the Audio to the DRM Protocol 3 16 07 888 2001 895 2 21 WARNING Disconnect primary power prior to servicing Section 2 Installation When the Content Server is communicating with the DRM Exciter the MDI LED will be Enabled and the MDI Fault LED will be extinguished on the front panel 2 4 2 2 2 MCI Interface Connects to J4 on the rear Panel The MCI Interface is used in the setup of the DRM Exciter
124. ved 3 54 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing Section 3 Operation v DRM Modulator Control Interface MCI x File Special Help 3 Open E Modulator ID T Save As DRM Test a I saw Ok Initialization freq 1250000 Mode 22 98 AM 750 Hz v ClockMult 1 Frequency 1250000 Hz Ok PhaseCorr 2000000000001 l 7 A PhaseCor 100000000000 A C OO PhaseCorr 1025000000000 _ Adjustment PhaseCorr 1025350000000 DAC Delay 5 28 4 usec PhaseCorr 10 25 35 40000006 Adjust PhaseCorr 10 25 35 40400000 DAC Bias 720 mV 1500 0 PhaceCorr 10 25 35 4040 35 35 3 Clipping Ratio 100 je oe PhaseCorr 10 25 35 40 40 35 00 g PhaseCorr 80 80 70 60 50 30 20 g Read All X Phase Con Q Check For Data Clear Terminal Figure 3 17 MCI File menu You can also save MCI settings to a file on the Content Server computer The options for saving and loading MCI settings files are in the File menu in the MCI To save your settings to a file use File gt Save As To read settings in from a file use File gt Open 3 16 07 888 2001 895 3 55 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 10 Digital Interface LED Indications Table 3 2 Digital Interface LED Descriptions
125. vel 44 1 kHz Internal Word Clock Lo Gain 48 0 kHz AES SPDIF In 4 dBu 64 0 kHz SPDIF Out ADAT In 10 dBV 88 2 kHz F ADAT1 AutoSync Ref Output Level 96 0 kHz F Professional Input ADAT1 HiGain 128 0 kHz Emphasis Freq 48 0 kHz 4 dBu 176 4 kHz l Non Audio System Clock 10 dBV Mode Master Ph 192 0 kHz SPDIF Freq ones a Freq 48 0 kHz Hi Gain SyncCheck 4 dBu ADAT In Sync 10 dBV SPDIF In No Lock WordClock No Lock Select or check the appropriate buttons and check boxes as described in the table Do not modify settings not referred to in the table The HDSP Configuration application may then be closed and the settings are saved as default values 3 2 7 2 Audio Mixer Settings To adjust the mixer settings described in the fifth column of table 3 1 select an unused desktop and click on the HDSPMixer icon The following window will appear 888 2001 895 3 5 WARNING Disconnect primary power prior to servicing Section 3 Operation bd HDSPMixer DRMCSdef mix File View Options 2 MUTE SOLO View Input Playback Output Submix Presets T2353 At ae fas Boas Boas ao far i as ff seu ser Bf ani i anz This graphically represents a mixer of the inputs to the system At the bottom of each slider VU meter combination is a white label for each input In 1 In 2 etc The inputs of importance to the DRM system are as follows Inl amp 2 ADAT
126. vice 3 output About 0 Audio Coding gt r SO Source MPEG AAC z _ PRBS test CELP aac file S HVXC wav file gt live audio V 50 SBR Flag 50 Audio Mode C mono param stereo stereo T 0 Text Flag r 0 Enhancement Flag SO Audio Sampling 8kHz 12 kHz 46 kHz 24 kHz Possible bits in MSC 13908 1738 bytes This screen lets you choose from the different settings that are part of the DRM system 3 3 2 1 Interface with CS via Send Command The settings from the GUI take effect when you press the Send button If the Content Server is running the configuration change takes place immediately If the Content Server not running the new configuration will be use the next time it is started The Send button is located in the top right corner of the Content Server GUI It sends all information from all tabs to the configuration file 3 16 07 888 2001 895 3 13 WARNING Disconnect primary power prior to servicing Section 3 Operation 3 3 2 2 Preset Button M UMeter m ih s S to AM Send F Clocktime V Show Diagnostics DRM CSB 100 Content Server Transmission Service 0 Service i Service 2 Service 3 Output About Load Configuration Description Save Local AM 10 kHz weak protection high quality stereo 35 kbps Predefined Configurations Local AM 10 kHz weak protection high quality stereo 35 kbps Loc
127. while Also for this reason avoid overusing the command on boot slot 0 the factory default configuration since you cannot reprogram that boot slot s program to allow you to use parameters slots there again A settings slot becomes used up every time you save parameters to the flash Whenever you save the parameters the configuration is saved to the boot slot that was selected when the modulator was last booted That is changing the boot jumpers after booting the modulator does not change which boot slot is used for saving parameters to the flash Every time the modulator is booted its boot jumper settings and frequency switches are read If no parameters exist in the flash for the selected frequency some default values are used To save the settings to the flash 1 Make sure your frequency switches are set to the frequency you want to use 2 Boot to the boot slot you want to save your settings in 3 Adjust the modulator using the MCI to operate with the settings you want to use 4 In the MCI interface choose the menu item Special gt Save Parameters 5 You can check that your settings are saved by resetting the modulator or turning it off and back on and then issuing a Read All command from the MCI You can even select Phase Corr in the MCI and select Read All in the IPM correction window to read the saved IPM coefficients from the Modulator You should see the same parameters that you just sa
128. with the digital transmission There are also front panel switches to enable the user to force the system into analog mode Finally the GUI can command the Modulator to change to analog mode Only the first two options in the AM DRM Modes section of the GUI should be used The option labeled Pure DRM sends a digital DRM signal containing digitized audio receivable only by DRM capable receivers The option labeled AM by External Modulation generates an AM carrier with audio modulated by the input to the DRM Modulator rack mount unit This outputs a standard analog AM signal only receivable by legacy analog AM radios The audio input to the DRM CS computer is not used in this mode the audio source must be connected to the DRM Modulator rack mount unit audio inputs for your signal to be modulated with audio in this mode Other modes are still under development 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 3 2 5 Services 50 Service Label Harris Broadcast SO Service Identifier Section 3 Operation M Show Diagnostics Confiquration Transmission v F x M UMeter Fe H S to AM Send DRM CSB 100 Content Server Service 1 Service 2 Service 3 Output About 50 Stream Id x 7 r 0 Audio Coding gt r SO Source 0 CA 2 5 MPEG AAC C PRBS test 1193046 Y gt T CA System Used i Jee v EEI y 0 Audio Data CAE wav file S0 Language See Ee
129. y 1250000 DACBias 1250 TA AmpGain 100 Clock Mult C Initialize DACDelay 10 56 DACBias 1250 Amplitude Gain 100 ClippingRatio 100 Adjustment Ok DAC Delay 10 56 usec DACDelay 10 56 Ok DAC Bias 1250 lt mV 1500 0 DACBias 1250 a Ok Clipping Ratio 100 100 none ClippingRatio 100 Read All 3 Phase Corr Q Check For Data amp Clear Terminal Figure 3 7 Successfully read back parameters from Modulator with Get ID and Read All and reapplied them with Adjust Press the Get ID and Read All buttons to load the transmitter ID and parameters from the Modulator memory and display them in the Modulator Control Interface Apply your changes with Adjust They will be transmitted over the serial cable and saved to the RAM in the DSP chip on the DRM Modulator Board 3 6 Transmitter Optimization 3 38 There are three critical adjustments that can be set by the Modulator Control Interface to compensate for the characteristics of a specific transmitter a Setting of the DC Bias corresponding to zero output the reference level for DRM amplitude signals With a DX Series transmitter this is approximately set by turning the maximum power carrier level control to minimum Fine adjust ments can then be made by setting the DAC Bias parameter in the Modulator Control Interface MCI b Nearly all transmitters have more delay in the a
130. y It would send a broadcast packet on its Ethernet 1 connection and listen for a DHCP server a router or other computer on the network configured for this purpose to respond with an IP address for it to use The DHCP server would also provide information on how to reach the Internet This is typically how one would configure the Content Server to set its system time from the Internet If you do not have a DHCP server and wish to use Ethernet time synchronization or otherwise connect your Content Server to a LAN you will need to manually assign a static IP address and enter the subnet mask you are using Also enter the IP address of the router the CS should attempt to contact in order to access the Internet called the Default gateway 888 2001 895 3 16 07 WARNING Disconnect primary power prior to servicing 3 16 07 Section 2 Installation You should enable the Ethernet 1 connection if you want to attempt time synchronization or if you wish to access the Content Server remotely for example to change the DRM text message To quit the Ethernet configuration choose File Quit from the menu in the main dialog isi Profile Help O Save Ctr S D 2 d Activate Deactivate J Quit Ctri Q DEVICES 4 2 You may configure network devices associated with 35 physical hardware here Multiple logical devices can be pE associated with a single piece of hardware Petes owe ware Tee

888-2001-895 - Gates Harris History

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