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UR4D RECEIVER

1. Antenna A CH1A RF overload double 264 3 107MHz 3 pole tracking 20 dB 3 pole tracking balanced 110 6MHz 13dB 2nd Image 2nd IF filter LNA filter mixer SAW IF Gain Filter Filt Quadrature ilters Detector Channel 1A splitter Tx Um o Audio Z mx 7 CN QH t X Fm ORS Q9 D TR T RSSI 2nd mixer and gt IFGain IC C CH 1 Track Tune control 4 Jumper PLL controled 1st LO r Harmonic 1488 2nd LO vco filter filter splitter 443 loop filter ZN Gain splitter QV p 180mA ess odpm b X CN gt WO E X c 77 IL Harmonic E ps 99 9 MHz m 4 course tune 32MHz lt Clock Data Synthesizer m overload detector Load enable gt gt RF overload RU lt lt lt gt AZ 10 7MHz 2nd IF xidBm qm Filters Quadrature 7 Detector Channel 18 gt CX CX Y DS Pm Ae Audi S 4 CX CX 2 f b gt gt H gt gt 3277 CX NL e Noise 3 pole tracking 20 dB 3 pole tracking double 110 6MHz 13dB 2nd Image 2nd mixer and 655 gt filter filter balanced SAW IF Gain Filter IFGain IC dod overload detector gt gt
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3. 25 1099 Rev 1 49 COMMROUTER PCB B Lt di C94 650 C57 Qo mr mo ooco2 9900 Gm omo oo OOOOON Gc ac ae ae 0c 0 0 c o ac CONB 0000000000000000000 8 4 54 amp S ans 5 54 Us Of 02 1C10 q o e LORD T eR 25 6 e C74 8 1 Ei C45 Lin Lu 5 CON7 C3 154 Co O E en Ela 005 J 9 gie 102 ra Ton E 1 usc foeoficag 30 18080 Ten 1 MTG2 o n CONG B CON4 2 051 SIDE 1 CON1
4. Architects and Engineers Specifications The wireless system shall operate in the UHF band between 518 MHz and 865 MHz with the specific range being dependent on the user s locale The system shall include the option of changing the operating frequency in order to avoid RF interference enabling up to 108 systems to operate simultaneously in the same location Preconfigured group channel and frequency setups shall be available to ensure that multiple systems in use do not interfere with one another All transmitters shall be powered by 2 AA batteries and shall have a power on off switch The bodypack will have an LED indicating that power is on Available transmitters shall include a body pack for use with electric guitars basses and other electric instruments and a handheld microphone for vocals The system shall have a DC DC converter to ensure consistent performance even if battery voltages change The receiver shall have a user programmable menu driven LCD screen showing group channel frequency name squelch level and locked unlocked status The system shall use technology such as MARCAD signal combining circuitry to improve reception minimize signal dropouts and achieve the best possible signal to noise ratio Tone key squelch and noise squelch circuitry shall be built in to the system to provide optimal sound quality and minimize unwanted noise The receiver shall include dual RF meters one for each antenna an audio
5. POWER SUPPLY 1 l Remove top cover 1 Remove 12 screws from 2 Hemove the Top cover Remove front panel Unplug the ribbon cable from front panel Unplug the ribbon cable from headphone board Remove 4 nut from inside bottom Unplug power switch harness Remove 2 screws from top far ends ei doo mort Reverse above procedure to assemble 25 1099 Rev 1 19 ALIGNMENT FACTROY ADJUSTMENT METHODS Test Equipment Most test equipment needed is described in the Shure WirelessService Equipment Manual The following test equipment or approved Equivalent is also needed RF Generator HP E4400B Audio Analyzer HP 8903B Digital Multimeter Fluke 87 Frequency Counter HP 5381A Spectrum Analyzer HP 8594E Shure Transmitter UR1 UR2 DC Blocker PT 1838W Cable Assembly BNC male both ends 2 PT 1838A Toray non Inductive tuning tool PINK PT 1838L Toray non Inductive tuning tool white PT 1838M Toray non Inductive tuning tool blue PT 1838K Non inductive hex driver for tuning wrench PT 1838N Cable XLR F to double amp single banana plug PT 1841 dB Conversion Chart OdBV 2 214 dBu OdBu 0dBm assuming the load 600 ohms Be aware that dBu is a measure of voltage and dBm is a measure of power The 8903 for example should be labeled dBu instead of dBm since it is a voltage measurement
6. RF overload gt double Qe 107MHz 3 pole tracking 20 dB 3 pole tracking balanced 110 6MHz 13dB 2nd Image 2nd IF filter LNA filter mixer SAW IF Gain Filter Filters Quadrature Detector Channel 2A p Audio gt HRS cx LX 0914 HS Hae eH LL noise 1 RSSI 7dBm 2nd mixer and gt IFGain IC 4 CH 2 Track Tune control M M PLL controled 1st LO gt Harmonic 1488 Harmonic pis Lo VCO i loop filter T fiter Gain filter splitter r pu spite J al 2 gt t A i 5 Harmonic lt VCO course tune 32MHz J Antenna B 05 AE 4 Clock Data W Synthesizer 4 overload detector I4 Load enable p gt CH2B RF overload z M 2 J BS 10 7MHz 2nd IF ia Filters Quadrature Channel 2B splitter T Y Detector ox Tx Ed ll Z Audi X A cx gt Audio 2 gt ANT gt LM gt IND 0 gt QH X X N 7 RS fuse lt L X2 B 4 Noise gt C 3 pole tracking 20 dB 3 pole tracking double 110 6MHz 13dB 2nd Image 2nd mixer and RSSI gt m filter LNA filter balanced SAW IF Gain Filter IFGain IC mixer 7 14 3 VDC 77771 150mA 25 1099 Rev 1 9 RF Sub System General Description 25 1099 Rev 1 The receiver RF Sub Syste
7. The outputs from both 151 and 279 local oscillators are shared between RF sections A and B Demodulation produces the following baseband information signals Audio with Tonekey and Noise Each RF channel outputs the following respective information signals to the audio section of the 190 044 main board Audio A Audio B Noise A Noise B A 32kHz ASK Tonekey signal is embedded within the audio signal and will be filtered and demodulated in the audio section of the 190 044 main board After conversion to the 2 IF the signal level present in each RF section is detected A DC signal proportional to the 279 level is created and referred to as the received signal strength indicator or RSSI When antenna signals are within the receiver s normal operating range the RSSI is displayed by a string of six LEDs on the 190 046 display board Antenna signals that exceed the maximum dynamic range of the receiver are detected in each 2 d F section by separate RF overload circuitry A DC signal proportional to the RF overload level is generated and used to activate a RF overload LED on the 190 046 display board Each RF channel outputs the following respective DC signals to the 190 045 microprocessor board RSSI A RSSI B RF overload A RF overload B Audio general description The audio and noise outputs of the FM detector are trimmed for level and applied to the MARCAD circuit The MARCAD circuit compares the noise of both channels and decides which
8. 25 1099 Rev 1 Printed in U S A 222 Navigate 5 o o0Lo o ollo Seem 28 2 with Audio Reference 09 EIE idi ompanding 5 C receiver outputs receiveroulputs Ain balanced low Z balanced 7 un p 2000 FN f N 9 a de WY exi 4 9 7 bad gis Be g S 12 7V 7 12 7V Toma SA GND GZ GND C FIGURE 1 UR4D AND 0845 FRONT AND REAR PANELS Receiver Controls and Connectors 25 1099 Rev 1 1 2 SYNC Infrared IR port Transmits group channel and other settings to a transmitter Squelch LEDs Blue On Transmitter signal detected Off no signal or signal squelched because of poor reception or no tonekey NOTE The receiver will not output audio unless at least one blue LED is illuminated 3 RF LEDs Indicate RF signal strength from the transmitter at each antenna and diversity condition Amber normal Red overload greater than 25 dBm 4 Audio LEDs Indicate audio signal strength from transmitter Green signal present Yellow normal peak Red overload 5 6
9. Rev 1 29 AUDIO RMS METER VALUES LED Deviation Typical values Reference output level 1kHz modulation XLR balanced GO 10 7 kHz 31 27 78 dBu G1 15 2 kHz 65 18 78 dBu G2 20 2 kHz 92 9 78 Bu G3 23 8 kHz 108 3 78 dBu 4 28 0 kHz 124 2 21 dBu Y5 32 9 kHz 139 8 21 dBu Y6 38 6 kHz 154 14 21 dBu R7 45 0 kHz 169 20 21 dBu D 4 Decay time NOTE Repeat above steps to next channel AUDIO PEAK METER VALUES 25 1099 Rev 1 30 Deviation LED 1kHz modulation Typical values GO 15 2 K Z 35 Gi 20 2 KHz 48 G2 23 8 KHz 58 G3 28 0 KHz 68 Y4 32 9 KHz 83 Y5 38 6 KHz 98 Y6 45 0 kHz 115 R7 Decay D 4 Stack avg S 12 size PRODUCT SPECIFICATIONS USING AN HP ESG SERIES SIGNAL RF GENERATOR set the RF generator frequency to the first available receiver frequency level 65dBm FM waveform Dual Sine FM Tone1 1kHz 9 33kHz deviation and FM Tone2 32 000kHz 15 of tone 1 deviation this is equivalent to 28 kHz deviation of a 1KHz tone with 5kHz deviation of a 32kHz tone Use audio analyzer bandwidth of 30kHz A weighting is off unless otherwise specified specifications are over temperature range 18C to 57C unless otherwise specified Typical values are at 25C Specification Minimum Typical Maximum Frequency range 518 MHz
10. T To correct this level adjust the transmitter gain Indicates the name and range of receiver frequency band LCD Interface Provides a convenient way to program the receiver from the front panel Monitor 1 4 output jack and volume knob for headphones Monitor Clip LED indicates headphone audio is clipping Dual models Push the knob to switch from receiver one to reiver two 8 9 10 11 Power SWitch Powers the unit on and off AC mains power input IEC connector 100 240 Vac AC mains power passthrough unswitched Use with an IEC extension cable to supply AC power to another device Diversity antenna inputs A and B Note Antenna inputs are DC biased Use only antenna combiners and accessories listed Some types of antenna splitters or other products may short the DC power and damage the receiver Bias can be removed through internal jumper setting 12 13 14 15 16 17 18 Mic Line switch Changes output level 30 dB XLR output only Electrically balanced XLR output jack Lift GND switch Lifts ground from Pin 1 of the XLR connector default 2 GND Impedance balanced 1 4 output jack 2000 USB jack for computer interface RJ 45 jack for Ethernet network interface Accepts both regular and ruggedized RJ 45 plugs Temperature activated fan ensures top performance in high temperature environments Clean fan screen as needed to remove dust Standard Operating Conditions Power Supply
11. These two terms are often used interchangeably even though they have different meanings 25 1099 Rev 1 20 UR4D CHANNEL 2 ALIGNMENT PROCEDURE ALIGNMENT Align Receivers 1 and 2 seperately Receiver 1 is on the left side and Receiver 2 is on the right side when looking at the front panel Equipment setup for the alignment procedure is sequential PRE TEST SETUP TEST SETUP 25 1099 Rev 1 e Frequency Band Tuning Frequency Tuning Frequency PCB Group Names MHz MHz A H4 US Canada 578 000 548 000 A H4E Europe 578 000 548 000 B 45 US Canada 638 000 607 000 B J5E Europe 638 000 607 000 13 US Canada 698 000 668 000 Europe 698 000 668 000 D Q5 Europe 814 000 777 000 D Q6 Korea 814 000 777 000 Q9 US Canada 814 000 777 000 D Q10 China 814 000 777 000 D ABJ Japan 814 000 777 000 E R9 UK Europe 865 000 828 000 Remove the top cover from UR4S UR4D receiver To reduce the risk of electrical shock do not touch or short any components in the receiver switching power supply The heat sink on the power supply and all AC wiring contains hazardous voltages Dc voltages are present at most RF test points Use DC blocks on the RF signal generator to protect the test equipment Use 58 or any other low loss 50 ohm cables for all RF connectons Keep test cables as short as possi ble Include insertion loss of cable and connector
12. 02 DIODE SCHOTTKY DUAL SOT 323 184 85 IC8 TRANCEIVER BUS SOIC 20 74LCX245WM 188A281 MICROPROCESSER INTEGRATED 32 BIT 324BGA 188A470 6 IC CLOCK FLASH PROGRAM 188A476 4 IC TRANSCEIVER FAST ETHERNET 188A477 IC10 MEMORY FLASH 188B478B IC11 RAM SYNCRONOUS DYNAMIC 143MHZ 50TSOP 188B525 9 IC SUPERVISORY PROCESSOR MANRESET SOT23 1 88A565 2 TRANCEIVER USB ADVANCED MODE INP HBCC16 188 651 CONG 95 8983 08 24 0548984 25 1099 1 48 PCB ASSEMBLY UR4 RECEIVER E Cau 2E Se oe us ABCDE BI CONS SHLD12 C353 0 Ca 291 882 0079 viz CONSO shos 157 CENE caos cpap eni s cw coio iem i costa m7 0377 Cr a 8 coo 8286 58293 8 oo 8 of L3 J cos f 88 mns 03 qus cag Res 55 I3 TE nh g 15 BRI Secs 8 2 L83
13. 025 Turn the Control wheel to change the value Automatic Transmitter Sync Menu Sync 25 1099 Rev 1 3 Receiver Name Menu Util Turn the Control wheel to change the letter Push the Control wheel to move to the next letter Output Level Menu Audio This setting adjusts the signal level at the XLR and 1 4 audio output jacks e Turn the Control wheel to change the relative level in dB 0 dB to 32 dB Turn the wheel all the way down to mute the outputs Squelch Menu Radio Squelch Turn the Control wheel to change the parameter Receiver Lock When locked the receiver settings cannot be changed from the front panel However you can still navigate the LCD menu to view the settings and turn the lock off Menu Util gt Lock Turn the Control wheel to toggle the lock on or off ON or OFF LCD View Menu Util gt Title Turn the Contro1 wheel to mark an item for display Push the Contro1 wheel to move to the next item LCD Contrast Menu Util Contrast Turn the Control wheel to increase or decrease contrast Tonekey Menu Radio Squelch Tonekey Tonekey squelch mutes the outputs unless the receiver detects a transmitter Tonekey should be left on On except for certain trou bleshooting operations 25 1099 Rev 1 4 Network Parameters NOTE The receiver reboots after you press ENTER to accept network parameter changes In dual models UR4D these settings affect
14. 1 and 2 URAS systems send antenna signals directly to channel 2 without splitting Receiver channels 1 and 2 are identical so operational descriptions of a single receive channel may be applied equally to both channels in a system Each RF channel requires 15V and 5 from the power supply Each channel frequency is user adjustable from the 190 046 display board Several signals are derived from the channel frequency are used to automatically tune the RF section The following tuning related signals are input to the RF section from the 190 045 microprocessor board digital signals Clock Data Load enable signals VCO course Tune voltage Track tune filter voltage The front end incorporates two track tuned filters for superior protection from unwanted signals while providing an industry leading 60 MHz of frequency coverage per SKU slightly more in the higher frequency bands Conversion to the 18 IF is accomplished through a double balanced mixer to provide greatly improved RF dynamic range and system compatibility The design also uses 15 IF frequency of 110 6 MHz together with a narrow SAW Surface Acoustic Wave filter to minimize spurious unwanted receiver responses The Saw filter is followed by a 1St IF amp and 2 pole band pass filter providing improved sensitivity and second image rejection The 279 F consists of an integrated amplifier and mixer coupled with a discreet designed 99 9 MHz crystal oscillator
15. 2 dBm 25 2 dBm Note 1 Referenced to 12dB SINAD Note 2 Referenced to 1 distortion 25 1099 Rev 1 16 Functional Test Listening Test Before completely disassembling the receiver operate it to determine whether it is functioning normally and try duplicating the reported malfunction Refer to the User Guide for operating instructions troubleshooting suggestions and specifications Review any customer complaint or request and focus the listening test on any reported problem The following more extensive functional tests require partial disassembly Test Equipment RF Generator HP E4400B Audio Analyzer HP 8903B Digital Multimeter Fluke 87 BNC TO BNC Male cable PT 1838A Spectrum Analyzer HP 8594E DC Blocker PT 1838W Cable XLR F to double amp single banana plug PT 1841 Audio Frequency Response Test Set Up 00 mx Connect to RF generator to either antenna port A or B with appropriate coax cable and DC block Connect audio signal analyzer to the XLR balanced output of the appropriate channel Set mic line switch is in Line position up Set receiver audio output is set to 0 dB Audio menu Turn off receiver tonekey detection Radio gt Squelch gt Tonekey menus Tune receiver to the fyip Refer page 21 of its operating band Radio menu Tune RF generator to the same frequency Set RF generator to 28kHz deviation 1kHz FM modulation 40 dBm a
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17. ALIGNMENT Connect the RF signal generator to antenna port B Using a short piece 1m of 50 O coax Connect the spectrum analyzer input to I 5 Adjust CV12 to maximize the spectrum analyzer power at fo Adjust CV11 to maximize the spectrum analyzer power at fo 9v Be eor Adjust CV13 to maximize the spectrum analyzer power at fo CHANNEL 1B IMAGE REJECTION FILTER ALIGNMENT Connect the spectrum analyzer input to I 7 Adjust CV5 to maximize the spectrum analyzer power at fp Adjust CV6 to maximize the spectrum analyzer power at fp Adjust CV4 to maximize the spectrum analyzer power at fy ge m Readjust CV11 to maximize the spectrum analyzer power at fy 18 dBm typ CHANNEL 1 15110 ALIGNMENT 1 Connect the spectrum analyzer input to 198 Near FL 17 2 Setthe spectrum analyzer Center frequency to 10 7MHz Span to 100KHz Amplitude to OdBm 3 Adjust the synthesizer crystal CV7 to center the 279 IF frequency at 10 7MHz 1KHz The spectrum analyzer power at 10 7MHz is 9dBm typ CHANNEL 1B QUADRATURE COIL ALIGNMENT 1 Set RF signal generator as follows Amplitude to 40dBm Modulation to ON Modulation FM Modulating frequency to 1KHz Deviation to 38KHz 2 Connect the audio analyzer input to 404 Pin 7 of IC 400 3 Adjust L28 to maximize audio analyzer SINAD reading gt 50dB 4 Set RF generator as follows Amplitude to 100 dBm 5 Engage Audio Analyzer a weighting 6 Verify audio analyzer S
18. The output signal 15 less than the XLR output because it is only driven on the tip The XLR output uses two buffers to drive both pin 2 and pin 3 of the XLR at opposite polarities Half of the 200 Ohm build out resistance is included inside the feedback loop of the drivers to reduce output impedance 100uF 63VDC capacitors are used for phantom power protection A 30dB resistive pad is available just before the output connector to provide the user with options regarding system gain structure 25 1099 Rev 1 A ground lift switch is also provided on the back panel It lifts 1 from the XLR and also the shield connection of the 14 jack from ground This option can help reduce hum in certain instances The ground lift for the 14 jack only works if the threads and nut of the connector are isolated from the chassis they currently not but could be modified to be so in the future The output of the two XLR drivers is also sent to the Headphone amp Using a balanced pair helps increase noise immunity inside the receiver The headphone amp board is a separate board mounted to the front panel It uses a volume control with an integrated push button to switch between channel 1 amp 2 on a dual and on off in a single receiver The push button is de bounced with an RC network followed by a Schmitt input buffer The output of the buffer drives a D flip flop set up as a toggle The flip flop output controls a quad analog switch to select whic
19. alone UHF R receivers Antenna UR1 518 578 MHz UA710 Antenna UR1 578 698 MHz 720 221 Antenna UR1 740 865 MHz 730 Antenna Power Distribution Two Antennas UR4 Band UA820 Amplifier recommended for 3 or 845 Dependent see table more receivers Transmitter Carrying Case 95A9053 U S A UA845US Europe UA845E Optional Accessories UK UA845UK SM58 Head with Grille RPW112 1 2 Wave Omnidirectional DEEN 5 86 Head with Grille RPW114 Wideband Antenna 58 Head with Grille RPW118 Active Directional Wideband UA870WB BETA 87A Head with Grille RPW120 l _ 87 Head with Grille RPW122 SMB87A Head with Grille RPW116 Unididrectional Wideband Antenna PA805WB KSM9 SL Head with Grille RPW180 wave antennas 2 KSM9 BK Head with Grille RPW184 Sune Matte Silver Grille SM58 RK143G Matte Silver Grille SM86 RPM266 GE Ge Gig Bonds 8200 Matte Silver Grille BETA 58 RK265G A BI Black Grille SM87 214 Matte Silver Grille BETA 87A RK312 23 AMENNA pices Matte Silver Grille BETA 87C RK312 35 SEDE Black Grille BETA 58 RK323G 100 Black Grille BETA 87 87C RK324G Black Grille KSM9 RPM264 Champagne Grille KSM9 RPM260 Belt Clip 44A8031 Body Pack Pouch Black UR1 WA580B Body Pack Pouch White UR1 WA580W Popper Stopper Windscreen A85WS
20. changed from the calibration menu by entering the Band submenu and rotating the control knob Press ENTER to confirm your changes Additional band limits may be set by entering the Band gt Bandlimit submenu Two sets of start and stop frequencies may be entered Toggle between limit variables start frequency L1 stop frequency L2 start fre quency L3 and stop frequency L4 by pressing the control knob Rotate the control knob to change the variable Set limits to On to activate the new band limits Press ENTER to save the changes Entering the RssiAvg submenu can change the response speed of the RF metering The RF meters are driven by the average value of the detectors RSSI voltage This average is taken over a limited number of samples the default number of samples 15 8 Rotate the control knob to change the number of samples used in calculating the average 1 200 Increasing the number will cause the RF meters to respond slower to changes in RF strength Press ENTER to save the changes hesizer Measure VCO power by connecting a 50ohm probe at the input to the mixer while leaving the mixer connected This level is typically 3 to 7dBm The MMIC amp after the VCO provides approximately 14 dB of gain VCO calibration sets three values of the course tune voltage Each value covers 1 3 of the tuning range of the receiver board group A B C D E Course tune voltage should show 2 step increases as the receivers is tuned from the lowest to hi
21. channel scan Otherwise all the receivers will be set to the same open channel NOTE Receivers in different bands H4 J5 L3 etc do not need to be set to the same group 25 1099 Rev 1 6 Networking Receivers Basic Network Computer optional Connect receivers to an Ethernet router with DHCP service Use Ethernet switch es to extend the network for larger installations Router with DHCP Use the receiver s default network setting Util gt Network gt Mode DHCP Accessing the Network with a Computer If you want to use the Wireless Workbench software connect your computer to the network and install the software from the CD that came with the receiver Make sure your computer is configured for DHCP from Control Panel click Net Computer work Connections Double click on Local Area Connection Select Internet Pro optional tocol TCP IP and click Properties Select Obtain IP address automatically and Router with DHCP Obtain DNS server address automatically and click OK NOTE Some security software or firewall settings on your computer can prevent you from connecting to the receivers If using firewall software allow connections on port 2201 Using USB Connect the computer to the USB port on any of the receivers to access the whole network Ethernet Static IP Addressing The receiver also supports static IP addressing Assign your own IP addresses Util gt Network gt Mode Manual See Netw
22. dB Frequency Response 3 43 dB From 50 Hz Aer Mene to 1 Operating Range 100 meters Additional Product Specifications Specification UR4S UR4D Nominal squelch setting 0 35 3 dB SINAD 35 3 dB SINAD Minimum squelch setting 10 25 3 dB SINAD 25 3 dB SINAD Maximum squelch setting 10 40 3 dB SINAD 40 3 dB SINAD 12 dB SINAD lt 104 dBm lt 100 dBm 30 dB SINAD lt 97 dBm lt 93 dBm 40 dB SINAD lt 88 dBm lt 84 dBm Radiation level of the first LO at antenna terminals conductive lt 90 dBm lt 90 dBm First IF frequency 110 6 MHz 110 6 MHz First IF rejection note 1 gt 100 dB gt 100 dB First Image rejection note 1 gt 110 dB gt 110 dB Second IF frequency 10 7 MHz 10 7 MHz Radiation tevel of the second LO 99 9MHz at the antenna terminals _ conductive 110 dBm 110 dBm Second IF rejection note 1 gt 127 dB gt 127 dB Second Image rejection note 1 gt 127 dB gt 127 dB Maximum FM deviation Note 2 gt 45 kHz gt 45 kHz S N ref 1kHz tone 45 kHz Dev 20 20 kHz BW 2105 dB gt 105 dB Third order 2 tone IMD test note 1 60 dB 60 dB Channel to channel diversity isolation note 1 56 dB typ 56 dB typ Expander Ratio 2 8 KHz deviation referenced to 28 KHz 1 kHz modulation 44 35 dBV 1 0dB 44 35 dBV 1 0dB Audio Meter Red LED Turn On 1 kHz tone 45 kHz Dev 45 kHz Dev Signal Strength Meter LEDs ALL ON 70 2 dBm 70 2 dBm Signal Strength Meter LEDs ALL OFF 90 2 dBm 90 2 dBm RF Overload LEDs ON 25
23. generator Amplitude to 804 Press the Get Navigate key Set RF signal generator Amplitude to 75dBm Press the Get Navigate key Set RF signal generator Amplitude to 704 Press the Get Navigate key Set RF signal generator Amplitude to 504 Press the Get Navigate key Set RF signal generator Amplitude to 25dBm Press the Get Navigate key Verify all RF LED lit on corresponding channel Press the Enter button to save all values 24 UR4D CHANNEL 1 ALIGNMENT PROCEDURE TEST SETUP 1 e 6 Press and hold the enter button and the top Navigate button closest to the enter button while powering the receiver ON Continue holding until the display stops changing Note The following menu is not present following a normal power up sequence Press the exit button to return to the main menu Select RF from the navigate menu Set RF signal generator as follows Amplitude to 10 Modulation to OFF e Frequency to see table above Set the spectrum analyzer as follows e Frequency to f see table above Span to 1 MHZ Amplitude to 20dBm Set the receiver frequency to fo VCO TUNING CHANNEL 1 Note VCO must be calibrated before tuning the preselector filters 1 2 3 T Remove HF section shield cover Through the Navigate menu select Audio gt RF gt VcoCal Follow the directions on the receiver s display The receiver is automatically tuning to the frequenc
24. is rectified and compared against a reference If the crystal filter output is below this reference it is determined to not be present and the comparator gates off the signal into the ADC Because the frequency of the crystal shifts over temperature care must be taken in setting the acceptance level to ensure proper operation over temperature 25 1099 Rev 1 The microprocessor determines if tonekey is present and controls an analog switch muting the audio into the low pass filter The microprocessor also uses this switch to mute audio during scanning functions or if the user gain is set to the mute position The low pass filter following the tonekey mute switch is used to strip off both the tonekey and any additional out of band high frequency noise that can corrupt the tracking of the expander The filter is derived from a topology first used in PSM receivers It combines a four pole 20kHz low pass filter along with a tonekey notch filter centered at 32kHz The low pass filter stage has its modified to counteract roll off of the notch filter and maintain flat response to 20 2 The final stage has a small DC bias 100mV applied to ensure proper bias on the proceeding electrolytic capacitors The signal from the low pass filter output is sent to the audio peak meter circuit and the expander The expander section is based on the design first used in ULX wireless except that it uses a THAT 4320 IC The input to the RMS detector is trimmed to
25. radiators heat registers stoves time or 2 or other apparatus including amplifiers that produce heat 14 REFER all servicing to qualified service personnel Servicing is required when the 9 DO NOT defeat the safety purpose of the polarized or grounding type plug A apparatus has been damaged in any way such as power supply cord or plug is dam polarized plug has two blades with one wider than the other A grounding type aged liquid has been spilled or objects have fallen into the apparatus the apparatus plug has two blades and a third grounding prong The wider blade or the third has been exposed to rain or moisture does not operate normally or has been prong are provided for your safety If the provided plug does not fit into your dropped outlet consult an electrician for replacement of the obsolete outlet 15 DONOT expose the apparatus to dripping and splashing DO NOT put objects 10 PROTECT the power cord from being walked on or pinched particularly at plugs filled with liquids such as vases on the apparatus convenience receptacles and the point where they exit from the apparatus CAUTION Observe precautions when handling this static sensitive device READ these instructions KEEP these instructions HEED all warnings FOLLOW all instructions DO NOT use this apparatus near water CLEAN ONLY with a damp cloth DO NOT block any of the ventilation openings Installin accordance with the manufacturer s instruct
26. range of 60 to 75MHz depending on the receiver model Each front end filter exhibits 5 6 dB of insertion loss depending on tuning voltage and 20 35 MHz bandwidth depending on frequency range high dynamic range SiGe HBT then provides 20dB of LNA gain The discreet LNA transistor is matched with high pass input and low pass output networks and is designed to maximize input IP3 A second 3 order Chebyshev tracking filter is provided after the LNA for superior image rejection and LO Antenna port isolation Output from the last front end filter is sent to a double balanced mixer The double balanced mixer provides excellent dynamic range and superior port to port isolation The LO port of the mixer is high side injected and driven at 7dBm from the 15110 section 154 Local Oscillator The 18 LO is derived from a dual control VCO The VCO contains two control ports referred to as course tune and fine tune The course tune control is a DC voltage derived from a tuning algorithm in the microprocessor section The microprocessor output is D A converted and DC amplified to cover 0 14VDC The tuning algorithm incorporates factory adjusted VCO calibration DAC values The course tune control adjusts the VCO to a frequency range close to the desired frequency Fine tune frequency control provides a high degree of frequency accuracy and is accomplished through a third order PLL The PLL frequency synthesizer derives a 25kHz reference frequency from a
27. set the appropriate threshold The threshold is set at the IC s internal reference voltage and the input level trimmed to that to minimize the effects of the 4320 s temperature coefficient The stage following the RMS detector sets the expansion ratio and provides the soft knee Feed forward ratio is defined as dBout 1 G dBin THAT CORP Application Note 101a which in this case 1 1 4 1 5 The Vbe temperature drift of the soft knee diode is compensated for by using a dual transistor package The second transistor in the package is used to subtract the Vbe drop from the output and thus compensating by sharing the same temperature and coefficient The expander control voltage is then summed at the gain control summing amp The required amount of fixed attenuation is derived and trimmed from the 4320 s internal PTAT Proportional To Absolute Temperature reference voltage The PTAT voltage is nominally 72mVDC at room temperature and has the same temperature coefficient as the RMS detector and VCA this provides temperature compensation for fixed attenuation The fixed attenuation is sent to the VCA via the gain control summing amp Filtering and scaling the DC output of an 8 bit DAC provides user gain The DAC output is scaled such that full scale output 3 3VDC results in a 32dB gain reduction 125dB register value Additionally summed with the user gain is a device power on off pulse This pulse causes the gain of the VCA to quickly go very l
28. 0 qo en E DUET 804 or 25 28 eff ag S Tm iz Eb EU EIS t Components side 2 View HEADPHONE AMP PCB ASSEMBLY cio RIOR cso 5814 e en 628 Owre2 e OUN 5 171083 5 RTO CRIS 9 C29 get Ed A IET l 052 RVI A so ER 205 RATS 11054 DNE CI ee C3RI9 02 mtr 2 1 9 9 is x Di 25 1099 Rev 1 51 Shure SHURE Incorporated http www shure com United States Canada Latin America Caribbean 5800 W Touhy Avenue Niles IL 60714 4608 U S A Phone 847 600 2000 U S Fax 847 600 1212 Int l Fax 847 600 6446 Europe Middle East Africa Shure Europe GmbH Phone 49 7131 72140 Fax 49 7131 721414 Asia Pacific Shure Asia Limited Phone 852 2893 4290 Fax 852 2893 4055
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30. 099 Rev 1 43 13 WASHER STEEL PLATED M7 46X8059 MP14 PANEL FRONT 48C8051 MP15 COVER STEEL COATED POWDER BLACK 53A8582 MP16 CHASSIS 95F9093 MP17 SHIELD WALL STEEL GALVANNEALED Front panel 53A8608 MP18 SWITCH POWER ROCKER DPST 55A8140 MP19 WASHER STEEL PLATED BLACK 30A8187A MP20 NUT HEX STEEL PLATED BLACK M9X 75 Monitor control pot 30A8186 MP21 ACUATOR NAVIAGATION POLYCARBONATE PRINTED 65A8490 MP22 LENS INFRARED POLYCARBONATE 65 8491 MP23 LIGHTPIPE MONITOR POLYCARBONATE 65A8495 MP24 ACUATOR CONTROL POLYCARBONATE PRINTED ENTER EXIT 65A8496 MP25 FENCE LIGHT ABS WHITE RF CH A B AUDIO 65A8497 MP26 STANDOFF HEX MALE FEMALE BRASS PLATED 32 31A8179 MP27 WIRE GROUND A C 90C8677 MP28 HARNESS WIRE AC 95A9091 MP29 CABLE RIBBON FLAT 24 CIRCUIT 4 AXON 95W8925D MP30 CABLE RIBBON FLAT 10 CIRCUIT 9 95G8925J MP31 SHIELD COVER STEEL PLATED RF SECTION 53A8468 MP32 COVER SHIELD STEEL GALANNEALED COMMROUTER 53B8620 BAG POLYTHYLENE 17 x25 29B8177 MP34 CLIP IR STEEL GALVANNEALED 5348624 MP35 SCREW PN HD SELF 2 5 6mm XLR CONN 30C8230A MP36 SPRING KNOB STEEL PLATED 31A8180 MP37 SCREW MACHINE HD FLAT PH STEEL BLK 24 40 30B1224C MP38 LABEL DATE CODE 28A384 MP39 LABEL HI POT 28A8248 MP40 NUT KEPS STEEL PLATED 4 40 30A1041 MP41 SCREEN MESH STAINLESS STEEL 53A8631 MP42 SHIELD FAN STEEL GALV
31. 100 VAC to 240 VAC 50 to 60 Hz Temperature 20C to 57C RF 80 to 20 dBm into 50 Ohms FM Deviation 45 kHz of 1KHz tone for THD lt 1 Operating Information The basic steps required for unit operation Switch and control functions Basic Settings User Interface and Status Indication UHF R RECEIVER PROGRAMMNING Receiver LCD Interface Menu Access Accept Changes Press the Navigate key next to the menu item you want changing a parameter ENTER button flashes Cursor Control navigate control SHURE Radio Sj E 524 025 MHz TV 32 Audio 3 G 3 Ch 1 Out 0dB 22 Push the Control to move the cursor to the next item the Control to change a Transmitter Status Display Everything under the Exit Cancel dotted line reflects the settings for the transmitter if present Receiver Parameters Use the following instructions to set parameters through the LCD interface parameter value Press the Exit button to cancel changes and return to the previous NOTE After adjusting a parameter you must press the flashing ENTER button to accept the change Group and Channel Menu Radio Push the Control wheel to move the cursor to the Group or Channel Ch parameter Turn the Control wheel to change the parameter Frequency Menu Radio Push the Control wheel to move the cursor to the integer value 741 000 MHz or fractional value 741
32. 15 switch Switch Switching 15VDC Power Suppl 4 117 PPY 4A 0 gt Ground IN Daisy Chain Ground lift Ed Out Switch 0 0 o 100 to 240 VAC 25 1099 Rev 1 8 CIRCUIT DESCRIPTION General Block Diagram Description The UR4D S incorporates four separate PC boards 190 044 main board 190 045 Microprocessor board 190 046 Display Board and 190 043 Headphone amp board The product is powered by a 3 X 5 universal switching power supply that provides 15 15V and 5 Power from the switching power supply is connected to the 190 044 main board and distributed from the main board to the remaining boards 3 3 for the microprocessor is derived from 5V by a linear regulator on the main board UR4D RF Block Diagram overload detector
33. 3 amp 22 report 100 V from UL Dual Receivers Korea CISPR 13 Q6 Emissions immunity Cetecom test report NOTE The list above constitutes the agency approval testing done at the time the product was originally approved It is recommended that anyone re certifying this product or any product re examine the list of required compliance tests to make sure all current and relevant testing is performed 25 1099 Rev 1 33 Receiver Input Center Signal Antenna Power Connector Type BNC IEC Actual Impedance 500 Nominal Input Level 95 30 dBm 100 240 VAC 50 60 Hz Maximum Input Level 20 dBm 240 1095 50 60 Hz Pin Assignments Shell Ground IEC Standard Bias Voltage 12 2 Vdc 9 150 mA maximum N A For remote antennas amplifiers 1000 XLR mic line switch 1000 25 1099 1 34 Receiver Audio Output Protection Monitor 1 4 1 4 Phono XLR Headphone Output Configuration Unbalanced Impedance Electrically mono 1 4 inch Balanced Balanced Actual Impedance 500 200 200 active balanced 150 mic Maximum Ouput Level 1 Watt 63 18 dBu 24 dBu 6 with 100 Hz modulating tone Pin Assignments Tip Hot Tip Hot 1 Ground Ring Hot Ring no signal 2 Audio Sleeve Gnd Sleeve Gnd 3 Audio Phantom Power No Yes Yes Co
34. 5608074 1128152175 COIL QUADRATURE 10 7 MHZ B2A8004 FES FEA FES FES FE7 FES FETO FETS FETA FETS FE FILTER CERAMIC 10 7 86A8991 16 FL17 FL18 FL19 FL20 MHZ R D SFELA10M7FAO0 ICON1 CON6 PIN JACK MINI 0548278 CON401 CON601 9578322 CON901 HEADER LOCKING 6 POSITION 0548363 CON400 CON600 FACE RIND MNT 9589084 25 1099 Rev 1 46 DISPLAY BOARD Display Board PCB ASSEMBLY 1905046 02 20 24 37 CAPACITOR TANTALUM SMD2916 4702 16V 1096 151AD476KD SW5 SW6 SW7 SW8 SW9 SW10 SWITCH TACT LO PROFILE 155A33 CONS ICONNECTOR CABLE RIBBON 24 CIRCUIT 170W30 CONI CONNECTOR CABLE RIBBON 24 CIRCUIT 170W30 01 02 03 04 05 TRANSISTOR GENERAL PNP SOT 416 5C 75 183A71 DS35 DS38 DS41 DS44 DS61 LED HYPER BRIGHT 0805 TRUE GREEN 184 61 DS26 DS29 DS32 ROS ELLO EIGHT 0809 TRUE 184B61 DS25 DS27 DS28 DS62 LED HYPER BRIGHT 0805 SUPER RED 184D61 En LED HYPER BRIGHT 0805 ORANGE 18461 DS40 DS42 DS43 LED HYPER BRIGHT 0805 ORANGE 184H61 DS23 DS24 LED HYPER BRIGHT 0805 BLUE 184L61 IC10 C15 BUFFER NON INV SCHMITT TRIGER SOT 353 188A584 14 INVERTER SCHMITT TRIG SOT 353 188A591 ico DUAL 2 INPUT US8 188 592 07108 REGISTER SHIFT 8 BIT 16 LEAD SOIC 188 594 IC13 IC COUNTER 4 BIT SYNG BINARY 188A600 IC4 IC5 1C6 REGISTER SHIFT 8 BIT SO 16 TSSOP 16 188C216 Ic DETECTOR VOLTAGE 2 1V S0T 23
35. 603 4 7K 5 187824 IC600 C601 1C610 1C612 1C614 1C626 IC627 AMPLIFIER OPERATIONAL DUAL SO 188A18 8 5 79161 SO 405 1 605 5 5 5 188 57 505 IC21 U2 U6 B TL C2272 188A118 C403 1C603 188A123 1C25 DUAL 188 136 ATOR VOLTAGE 3 3VTO263 LNI3940IS IC900 PEGULATOR 188A311 1 404 1 604 188A381 IC8 IC14 2h LOW 1888388 3161016151620 IC FM FRONT END MFP10 188A404 190310904 8BIT 20 SSOP 188A537 AMPLIFIER OPERATIONAL PRECISION SOT IC406 1C606 03 5 i 188 559 116510121017 3500 MHZ SOT 63 1884563 142816628 COMPANDER THAT4320 28 QSOP 188A568 IC4JC11 REGULATOR LOW NOISE ADJ VOLT SOT23 5 188A571 IC2 1C6 1C13 1C16 IC FM IF MFP16FS 188A583 140916609 IC AMPLFIER 130 MHZ R R OUPUT SOIC 8 1884668 7 EEPROM SPI SERIEL 8Kbit S08 188B601 IC9 IC18 IC AMP NMIC DC 4500 MHZ SOT 89 188A632 1219 DAC 8 CHAN 8 BIT 16 LEAD SSOP 188A635 1222 BUFFER 3 STATE OUTPUT ULP SC70 5 188A638 1227 CONTROLLER DRIVER FAN SO 8EP 188B658 QUARTZ OVERTONE 3ID 99 Mp Ar 370 99 900 49A8018W V5 Y6 CRYSTAL TUNING FORK 32 0 KHZ 0 8020 SHLD11 SHLD12 SHIELD FENCE STEEL TINNED 53 8502 SHLD13 SHLD14 FENCE SHIELD STEEL PLATED TIN 538538 SHLD1 SHLD2 SHIELD FENCE 53A8598 SW400 8W401 SW600 SW601 MIC LINE GND LIFT SWITCH TOGGLE DPDT VERTICAL 55A8148 CONT2 CON13 ISTRIP INTERCONNECT 3 POSITION
36. 900 MHZ CHINA 200Q10047 UA820Q 65N8599 R9 790 000 MHZ TO 865 000 MHZ EUROPE 200R9047 UA820A 04 65P8599 779 125 MHZ 787 875 MHZ JAPAN 200ABJ047 UA820Q 65G8599 ABJ 797 125 MHZ TO 805 875 MHZ JAPAN 200ABJ047 UA820Q 65G8599 ABJ 806 125 MHZ TO 809 750 MHZ JAPAN 200ABJ047 UA820Q 65G8599 UR4 HARDWARE REPLACEMENT PARTS REFERENCE DESIGNATION DESCHIETION NUMBER A1 PC BOARD ASSY UR4 HEAD PHONE AMP 190A043 01 A2 PC BOARD UHR COMMROUTER 190A045 01 BOARD DISPLAY UR4D 190D046 02 A4 BNC CABLE ASSEMBLY 95A9023 A5 CABLE ETHERCON 60in 95A9101 A6 CORD POWER AC TYPE SJT 95A8389 A7 CORD POWER JUMPER AC US 95A8576 A8 CABLE INTERCONNECT BD PHONE PWR 90F8848 A9 RECEPTALE POWER IEC DUAL INLET OUTLET 95A8577 A10 POWER SUPPLY SWITCHING 95A8995 A11 LCD ASSEMBLY 95A9038 A12 FAN CONNECTOR ASSEMBLY 95A9134 A13 CABLE BNC 1 7 25 95D8418 MP1 HARDWARE KIT 90V1371 MP2 NUT HEX STEEL PLATED M7x 75 30A8049A MP3 LOCKNUT STEEL PLATED 6 32 30A8185 MP4 NUT HEX BRASS PLATED 3 8 32 30A884B MP5 WASHER STEEL PLATED 30A961A MP6 SCREW MACHINE HEAD FLAT PH STL BLK 6 32 Top cover 30B8161A MP7 SCREW SEMS HEAD ROUND PH STL PLTD 4 40 pcb 30C622B MP8 SCREW SELF TAPPING HEAD PAN STL BLK 4 30C689C MP9 KNOB ENCODER BRASS PLATED BLACK 31B8169 MP10 KNOB MONITOR PLATED BLACK 31B8170 MP11 RACK EAR UR4 3268042 12 INSULATOR POLYPROPYLENE 34A8447 25 1
37. A 8 188D210 Swit SWITCH ROT ENCODER 24 POS 2 BIT 5588150 25 26 ICAPACITOR ELECTROLYTIC SMD 100uF 35V 2096 151BF107MF 2 BEAD FERRITE SMD 805 30 OHM 162A30 ICONNECTOR CABLE RIBBON 10 CIRCUIT 170630 TRANSISTOR TMOS SOT 23 FET 2N7002 183A30 D3 DIODE DUAL COMMON CATHODE SOT 23 85VDC 184A03 D1 D2 DIODE SIGNAL SWITCHING SOT 23 100VDC 184A08 DS2 DS3 LED HYPER BRIGHT 0805 YELLOW 184B61 DS4 LED HYPER BRIGHT 0805 SUPER RED 184D61 12163164165 AMPLIFIER OPERATIONAL DUAL SO 8 5C79161 188 18 7 D 188 509 5 5 5 50 16 06445 188A57 IC6 BUFFER NON INV SCHMITT TRIGER SOT 353 188A584 RVI POTENTIOMETER SWITCH LOG TAPER 100K 6 8059 CONI JACK PHONE STERO SWITCH RT ANGLE 1 4 9578322 25 1099 Rev 1 47 COMMROUTER BOARD Y 1 ICRYATAL HIGH FREQ SMD 25HZ 140 07 7 1 5 1206 1 16 10 151AD105KA 012 052 ICAPACITOE TANTALUM SMD1411 10uF 16V 10 151AD106KA C74 CAPACITOR TANTALUM SMD1206 2 2uF 6V 20 151AB225MA C90 C92 C94 C95 CAPACITOR TANTALUM SMD2412 22uF 6V 10 151 226 1 SERIES 161 07 4 10 170 78 0 2 0 3 0 4 0 5 0 6 DIODE EMITTING LIGHT PURE GREEN 184018 DS1 LED GREEN HYPER SIDELED HYPER BRIGHT 184 78 01
38. ABA77KD 441 450 473 487 641 650 673 687 CAPACITOR ELECTROLYTIC SMD TOOUF 63V 51 107 5 22 5 1 226 502 702 17 49 75 81 185 190 294 365 902 906 PAPAG TOR ELECTROLYTIC SMD 330UF 25V 518E337MG 418 419 460 463 601 606 607 618 619 151 475 660 C663 C903 C907 C911 123 146 289 310 D ACITOR ELECTROLYTIC SMD 47UF 25V 2 4 51BE476ME kasna CAPRCITOR EEECTROLYTIC SMD 470UF T6V 377 910 0 4 VUE TON 151 0477 P CV13 CV18 CV19 CV20 CV21 CV22 C V23 C V24 CV25 C V26 CV28 9 29 CAPACITOR TRIM SMD 2 0 6 0pf 152B05 CV7 CV17 ICAPACITOR TRIM SMD 3 15pF 152E05 14 15 CAPACITOR 4 5 20pF 152 05 U1 U3 U10 U11 U12 U13 SPILITTER POWER 0 DEGREE 161A02 1T4 16 17 18 110 111 113 114 ITRASFORMER BALUN TYPE 4 161A04 IT3 T5 T9 T12 ITRASFORMER BALUN SMD 458PT 1087 161A05 9911100 INDUCTOR SMD1008 18uH 162D06 E5 E9 INDUCTOR SMD 805 33nH 162F10 42 L43 L67 L68 INDUCTOR SMD 805 68nH 162K10 45 L46 L58 L59 L60 L61 L65 L66 L71 L72L73 L74 L81 L8INDUCTOR SMD 805 180nH H62R10 L93 L94 L102 L104 23 L26 L44 L57 L69 L98 INDUCTOR SMD 805 220nH 162510 E405 E406 E407 E600 E601 602 603 604 605 60 BE
39. AD FERRITE SMD 603 1000 OHM 29 L39L56 L92 INDUCTOR SMD 603 6 8nH 162K56 L4 L5 L31 L37 L50 L51 L53 L54 L55 L70 L86 L90 INDUCTOR SMD 603 8 2nH 162156 30 138 179 180 183 184 INDUCTOR SMD 603 100nH 162AC56 117 118 124 1300 1301 1304 INDUCTOR SMD 402 100nH 162AD65 FL1 FL9 FL11 FL12 FILTER SAW 110 592MHZ 162A68 CON900 CONNECTOR CABLE RIBBON 10 CIRCUIT 70030 CON902 CONNECTOR CABLE RIBBON 24 CIRCUIT 1701130 CONS BOARD 170A44 ON2 0 8mm 40 CIRCUIT 170477 05 06 TRANSISTOR UHF VHERESOT 23 NPN 183A03 20400 0600 ITRANSISTOR NPN DUAL SC70 6 183A56 03 04 09 010 ITRANSISTOR NPN RF 183A64 25 1099 Rev 1 45 1 02 0300 0301 183A66 D2 D5 D23 D28 D901 1 84403 D47 D48 D402 D403 D404 D405 D602 D603 D604 D605 DIODE SIGNAL SWITCHING SOT 23 100VDC 184 08 D37 D42 RECTIFIER SILICON 140VDC 184A20 D11 D14 D19 D33 DIODE SCHOTTKY CROSSOVER QUAD 184A60 D20 D21 D22 D29 DIODE SCHOTTKY SCD80 184A65 D26 D27 D30 D31 D32 D34 D35 D36 D38 D39 D40 D41 DIODE CAPACITANCE VARIABLE SC79 2 184472 D300 D301 D12 D25 D43 D44 D407 D408 D607 D608 DIODE SCHOTTKY DUAL SOT 323 184A85 D45 D46 DIODE SERIES SWITCHINGDUAL SOT323 184A86 2 FUSE RESETTABLE R 25L IMAX 150MA _ 187A12 RT1 RT2 RT3 R14 ITHERMISTOR SMD0
40. ANEEL1B RF LEVEL INDICATION AND OVERLOAD LED ALIGNMENT 1 Connect the RF signal generator to antenna port B Using a short piece 1m of 50 coax 2 Set RF signal generator Amplitude to 90dBm Press the Get Navigate key 3 Set RF signal generator Amplitude to 85dBm Press the Get Navigate key 4 Set RF signal generator Amplitude to 80dBm Press the Get Navigate key 5 Set RF signal generator Amplitude to 75dBm Press the Get Navigate key 6 Set RF signal generator Amplitude to 70dBm Press the Get Navigate key 7 Set RF signal generator Amplitude to 50dBm Press the Get Navigate key 8 Set RF signal generator Amplitude to 25dBm Press the Get Navigate key 9 Verify all RF LED lit on corresponding channel 10 Press the Enter button to save all values 25 1099 Rev 1 27 AUDIO TRIM Must be done in the following order DEVIATION TUNING SET UR4 AS FOLLOWS 1 2 3 Set frequency to Set UR4 Squelch to 10 Turn OFF Tonekey SET SIGNAL GENERATOR AND AUDIO ANALYZER AS FOLLOWS 1 Set Signal Generator Amplitude to 40dBm 2 Set Signal Generator frequency 3 SetSignal Generator FM Rate to 1KHZ 4 Set Signal generator Deviation 28KHZ 5 Connect Signal Generator to UR4 Antenna Port A or B accordingly to the table below 6 Disengage Audio Analyzer A Weighting 7 Adjust Audio Deviation Pots Accordingly to the table below C
41. ANNEALED 53A8632 MP43 NAMEPLATE REAR POLYCARBONATE 39B8460 MP44 CHASSIS RECEIVER STEEL PLATED 53B8581 MP45 NUT HEX 1 2 28 95W8631 MP46 LOCKWASHER INTERNAL TOOTH 1 2 95X8631 MP47 PROTECTIVE FILM SEN 8256 38A8019 MP48 KNOB ENCODER 31B8169 MP49 KNOB MONITOR 31B8170 MP50 SHOCKMOUNT ELASTOMER SILICON 36A8108 51 SHIELD COVER PLATED SMALL 53A8599A MP52 SHIELD COVER SMALL STEEL TINTED VCO 53A8602 MP53 SHUNT 2MM 95A2169 MP54 LCD FRAME 5348607 55 36 8102 25 1099 Rev 1 44 AUDIO Printed Circuit Board Replacement parts Designation reference Description Shure Part Number V2 Y3 CRYSTAL QUARTZ 3 2x2 5mm 32MHZ 140A30 TR400 TR402 TR403 TR600 TR602 TR603 POTENTIOMETER TRIM CHIP SMD 1K 146B02 ITR404 TR405 TR604 TR605 POTENTIOMETER TRIM CHIP SMD 5K 146D02 FRI TR2 1TR3 TR4 POTENTIOMETER TRIM CHIP SMD 10K 146E02 ITR401 TR601 POTENTIOMETER TRIM CHIP SMD 100K 146 02 C3 0603 16 52 150JE103JP 124 201 MAE SOV 10 151 104 C476 C489 C623 C662 C676 CC689 C919 C920 C928 C CAPACITOR TANTALUM SMD 1206 t uF 35V 10 54 AG105KA 031 CAPACITOR TANTALUM SMD29T6 15UF 25V 2 19 20 160 165 TouF 25V 2 51 AF156MD 104 199 151 225 E SMD2916 470F 6V 10 913 926 US TIU 51AD476KD CAPACITOR TANTALUM SMD2916 470UF 6V 1 200 395 b 4700 67 1 151
42. C on the tuning voltage line and sets the VCO to the highest frequency of the board group This is useful for retuning the filters The in circuit filter response can be checked by probing the filters test points with a 50 cable Test points are isolated from the filters by 500ohms A small dip in the center of the pass band is expected at the output of the second filter This dip is caused by the additional loading of the 19 IF The dip will not be present if the VCO is not present or not tuned Frequency response of one 3 order tracking filter 2 15 V tracking voltage 200MHz span Frequency response of Cascaded Filter LNA Filter 2V 15 V tracking voltage 200MHz span 25 1099 Rev 1 36 LNA Isolate the LNA by removing the adjoining tracking filters output and input capacitors Using spectrum analyzer with a tracking generator inject signal into the LNA Measure the output of the LNA by connecting the spectrum analyzer to the pad of the removed filter capacitor LNA BFP650 Noise figure 0 9 dB Input VSWR 1 311 Gain 20 23 dB 518 865 MHz Output P1dB 18 dBm Output IPS 30 dBm Reverse Isolation 30dB min Tracking generator 20 dBm Reverse isolation Double Balanced Mixer Provide 50dBm no modulation to the antenna port Without isolating the mixer measure the RF LO and IF ports of the mixer using a 50 ohm cable RF 43 to 47 dBm LO 3 to 7 dB
43. ECTION FILTER ALIGNMENTS SET UP qoc Through the Navigate menu select Audio gt RF gt Filter Verify receiver frequency is set to fy Verify that the receiver provides 14VDC to 32 U2 pin 1 Use a DVM for this measurement Connect the RF signal generator to antenna port A Using a short piece lt 1 of 50 coax CHANNEL 2A PRESELECTOR FILTER ALIGNMENT Pee de Connect the spectrum analyzer input to test point 14 Adjust CV25 to maximize the spectrum analyzer power at f Adjust CV24 to maximize the spectrum analyzer power at f Adjust CV26 to maximize the spectrum analyzer power at fo CHANNEL 2A IMAGE REJECTION FILTER ALIGNMENT gu ipu Connect the spectrum analyzer input to I 16 Adjust CV9 to maximize the spectrum analyzer power at fo Adjust CV10 to maximize the spectrum analyzer power at fo Adjust CV8 to maximize the spectrum analyzer power at fp Readjust CV24 to maximize the spectrum analyzer power at fy 18 dBm typ CHANNEL 2B PRESELECTOR FILTER ALIGNMENT QU o Tt Connect the RF signal generator to antenna port B Using a short piece lt 1 of 50 coax Connect the spectrum analyzer input to I 3 Adjust CV22 to maximize the spectrum analyzer power at fo Adjust CV21 to maximize the spectrum analyzer power at f Adjust CV23 to maximize the spectrum analyzer power at fo CHANNEL 2B IMAGE REJECTION FILTER ALIGNMENT 25 1099 Rev 1 RB Cage Connect the spectru
44. H1 Antenna A Channel Trim Measure at Value CH 1A TR400 1407 Pin 7 of IC 426 11 01dBu 0 01dB CH 1B TR402 1407 Pin 7 of IC 426 11 01dBu 0 01dB CH 2A TR600 1607 Pin 7 of IC 626 11 01dBu 0 01dB 2 TR602 1607 7 of IC 626 11 01 0 01dB THRESHOLD 1 Change Signal Generator Deviation to 2 8kHz 2 Connect Audio Analyzer Input to UR4 balanced output 3 Measure the balanced output of the channel being tuned and record value T1 4 Change RF deviation to 28kHz 5 Setmic line switch to Line 6 Adjust Threshold trim pot so that balanced output T2 T1 44 35dB 1 dB Channel Trim Measure at Value CH 1 TR401 XLR output T2 0 198 CH 2 TR601 XLR output T2 0 198 25 1099 Rev 1 28 FIXED GAIN Adjust Fixed Gain trim pot such that T2 2 21dBu 25 dB Channel Trim Measure at Value CH 1 TR403 XLR output 2 21dBu 25 dB CH 2 TR603 XLR output 2 21dBu 25 dB NOISE TRIM 2 trim pots 1 Change Signal Generator Amplitude to 95dBm 2 Adjust Signal Generator Amplitude in 5 dBm increments until closest to 35dB SINAD 3 Read these measurements on UR4 balanced output 4 Use 30kHz low pass filter with A Weighting on Audio Analyzer 5 Trim for 4Vdc at rectifier capacitor below Channel Trim Measure at Value CH 1A TR404 1420 near C462 marked A 4 0 0 05 VDC CH 1B TR405 1424 Near C476 marked 4 0 0 05
45. INAD reading A weighted is gt 12dB CHANNEL 1A QUADRATURE COIL ALIGNMENT 1 Connect the RF signal generator to antenna port Using a short piece 1m of 50 coax 2 Set RF signal generator as follows Amplitude to 40dBm Modulation to ON Modulation FM Modulating frequency to 1KHz Deviation to 38KHz 25 1099 Rev 1 26 3 Connectthe audio analyzer input to 1 401 Pin 1 of IC 401 Adjust L1 to maximize audio analyzer SINAD reading gt 50dB 5 Set RF generator as follows Amplitude to 100 dBm 6 Verify audio analyzer SINAD reading A weighted is gt 12dB E CHANNEL 1A RF LEVEL INDICATION AND OVERLOAD LED ALIGNMENT Set the receiver frequency to Set RF generator frequency to Through the Navigate menu select Audio gt Meter gt RSSI Turn off the RF signal generator modulation Set RF signal generator Amplitude to 904 Press the Get Navigate key eom 6 Set RF signal generator Amplitude to 85dBm Press the Get Navigate key 7 Set RF signal generator Amplitude to 80dBm Press the Get Navigate key 8 Set RF signal generator Amplitude to 75dBm Press the Get Navigate key 9 Set RF signal generator Amplitude to 70dBm Press the Get Navigate key 10 Set RF signal generator Amplitude to 50dBm Press the Get Navigate key 11 Set RF signal generator Amplitude to 25dBm Press the Get Navigate key 12 Verify all RF LED lit on correspondining channel CH
46. RF input no pre emphasis 14 5 dB 12 5 dB 10 5 dB Squelch Threshold settings 10 36 dB SINAD 40 dB SINAD 44 dB SINAD Squelch Threshold settings 0 30 dB SINAD 35 dB SINAD 40 dB SINAD Squelch Threshold settings 10 20 dB SINAD 25 dB SINAD 30 dB SINAD Signal Strength Meter LEDs ALL ON 73 dBm 25C 70 dBm 25C 67 dBm 25C Test RX at or as close as possible to mid band For UR4D set both channels to the same frequency before performing the test Note Max allowable change from nominal 25 C measurement is 3dB over full temperature range Signal Strength Meter LEDs ALL OFF 93 dBm 9 25C 90 dBm 250 87 dBm 25C Test RX at or as close as possible to mid band For UR4D set both channels to the same frequency before performing the test Note Max allowable change from nominal 25 C measurement is 3dB over full temperature range RF Overload Indicator LED ON 28 25C 25 dBm 25C 22 25 Test RX at as close as possible to mid band For UR4D set both channels to the same frequency before performing the test Note Max allowable change from nominal 25C measurement is 79 57C 4dB 18C 25 1099 Rev 1 31 Frequency Range PCB Group Frequency Band Names Min Typical Max Notes MHz MHz H4 US Canada H4E Europe 518 000 578 000 578 000 607 975 Excludes 608 000 to 614 000 MHz 45 US Canada 614 025 638 000 Radio Astro
47. SHURE UHF R Service Manual 25 1099 UR4D RECEIVER PRODUCT DESCRIPTION GENERAL The UR4D Dual Channel and UR4S Single Channel are top the the line UHF band Wireless microphone receivers Each unit is housed ina single space metal rack rack mount chassis The product is designed in five different frequency Groups spanning from 518 MHz to 865 MHz 00000000 5 o o o o o o o Narrow band track tuned front end filters Synthesized tuning with 25kHz steps High dynamic range LNA and double balanced mixers for maximum compatibility As many as 40 compatible channels within each 60Mhz band Front panel LED indication of RSSI and RF overload Full MARCAD diversity Tonekey squelching ASK modulated tonekey sends transmitter data to receiver Audio Reference Companding noise reduction system Front panel LED indication of audio signal level Isolated XLR and 4 balanced outputs Mic Line switch on XLR output Pin 1 lift for both XLR and 14 outputs Headphone monitor with separate clip indicator Bitmap LCD displays Bi directional IR link for data communication with UHF R transmitters Ethernet and USB connectivity for control and metering Universal switching power supply with daisy chain power connector Service Note Shure recommends that all service procedures be perform by a Factory Authorized Service Center or that the Product be returned directly to Shure Incorporated 2005 Shure Incorporated
48. See Prod spec s 865 MHz AC current drain 120VAC 60Hz single receiver without inline 131 mA 145 mA 0250 160 mA amplifiers or active antennas 170mA Q 57C AC current drain 120VAC 60Hz dual receiver without inline 180 mA 200 mA 25C 220 mA amplifiers or active antennas 225mA 576 DC voltage at RF antenna ports with 60 Ohm load 12 8 V 13 3 V 13 8 V UR4S 4088 SINAD channel or B measured at the lowest 92 dBm UR4S 88 dBm UR4S available receiver frequency A weighted UR4D 4088 SINAD channel A or B measured with both channels 88 dBm UR4D 84 dBm UR4D set to the lowest available receiver frequency A weighted Total Harmonic Distortion at 40dBm with 1kHz modulating 0 15 0 5 frequency 28kHz deviation Audio Output Level unbalanced output Rx audio Output Level 6 8 dBu 3 8 dBu 0 8 dBu setting OdB unloaded 28kHz deviation 1kHz audio 9 0 dBV 6 0 dBV 3 0 Audio Output Level balanced output Rx audio Output Level 0 8 dBu 2 2 dBu 5 2 dBu setting OdB unloaded Line 28kHz deviation 1kHz audio 3 0 0 3 0 Audio Output Level balanced output Rx audio Output Level 13 dBr 12 dBr 11 dBr setting 12dB unloaded Line 28kHz deviation 1kHz audio 17 18C 9 dBr 57 Measurement relative to Output Level setting OdB 100 Hz Audio Frequency Response with respect to 1kHz 50dBm RF input no pre emphasis 6 2 dB 8 2 dB 10 2 dB 10 kHz Audio Frequency Response with respect to 1kHz 50dBm
49. VDC CH 2A TR604 1619 near C662 marked A 4 0 0 05 VDC CH 2B TR605 1623 near C676 marked B 4 0 0 05 VDC TONE KEY ALIGNMENT NOTE Do not use Audio Analyzer 8903 for this measurement Use Volt meter DVM 1 Set Signal Generator Amplitude to 40dBm 2 SetFM Rate to 32 001kHz 3 Deviation to 5kHz 4 Frequency to 5 Connect Signal generator to UR4 appropriate Antenna channel port Trim Ch Trim Measure at Value Measure at Value Trim Measureat Value 167 79 167 CH 1 CV14 Peak TR1 1 5V 3 0 IC 25 PIN 5 IC 25 PIN 7 IC 25 PIN 5 CH 2 CV15 a Peak TR2 1 5V TR4 EN 3 0V IC 25 3 IC 25 PIN 1 IC 25 3 1 Adjust trim cap CV14 15 to maximize DC voltage at 167 1111 2 Adjust Tonekey trim pot TR1 TR2 for 1 5 VDC at I79 1112 3 Adjust Tonekey trim pot TR3 TR4 for 3 0 VDC at 167 1111 AUDIO METER CALIBRATION Under the Audio menu there is a new menu item called Meter Within this menu one can change the RSSI Audio Peak and Audio RMS meter levels and ballistics stored on the units EEPROM Use the push button of the encoder to selects a value to change Then use the encoder to change the value or with the intended signal level applied use the GET function to take a reading from the ADC and store that value Press the Enter button to store values to EEPROM when finished 25 1099
50. audio channel if not both to pass This circuit also compares noise levels to an overall minimum squelch level providing the noise squelch function The chosen audio channel is fed to both a tonekey detection filter and a 20kHz low pass filter via the tonekey mute switch The output of the low pass filter passes to the ARC expander section User gain is summed into the VCA here for an adjustable range of 0 to 32 dB The user can also mute the audio section from the audio menu This is accomplished by turning off the tonekey mute switch The output of the expander passes to the output drivers and on to the 14 and XLR outputs The XLR output has a 30 dB resistive pad that can be engaged by the user just before the output connector for best noise performance The tonekey detection filter is responsible for detecting presence of tonekey as well as conditioning the signal to be read by an ADC so that the encoded data can be read by the microprocessor The output of the audio section immediately after the MARCAD switches is fed to two series connected high Q 32kHz band pass filters These filters strip off both the modulated audio signal as well as any high frequency noise The signal at this point is good enough to use to detect the amplitude shifted data but is not robust enough to be used for tonekey squelching To provide the robust detection a 32kHz crystal filter is used The output of the crystal filter is used to gate the input to ADC Audio signal me
51. both receivers the dual receiver is treated as a single network device Set the Receiver Network Mode Menu Util Network 1 Push the Control wheel to move the cursor to the Mode parameter 2 Turn the Control wheel to set the receiver to one of the following values DHCP use this setting when connecting the receiver to a DHCP server Manual allows you to set the receiver to a specific IP address or subnet IP Address and Subnet Menu Util Network NOTE To change these settings the network mode must be set to Manual 1 Push the Control wheel to move the cursor to any of the following parameters IP IP address Sub Subnet mask 2 Turn the Control wheel to change the value Device ID Assists in identifying receivers through the Wireless Workbench Software has no effect on network identification Menu Util Network 1 Push the Cont rol wheel to move the cursor to the DevID parameter 2 Turn the Control wheel to set the receiver to change the value Custom Groups This feature allows you to create your own groups of frequencies Creating new groups Menu Radio Custom 1 Turn the Control wheel to select a custom group number 01 U2 U3 etc 2 Push the Contro1 wheel to move to the Channel parameter and turn it to select a channel 01 02 03 etc 3 Push the Control wheel to move to the Freq parameter and select a frequency for that channel 4 Push the NEXT menu key to select a frequency for the ne
52. ector The distortion detector circuit compares the output signal with the signal applied to the output drivers If enough difference distortion is detected the red clip light is lit The front panel display board contains serial data SPI display and collection devices as well as the circuitry used for infrared communication The LEDs are driven from a series of 595 serial to parallel latches Brightness is set by each LEDs current limiting resistor Buttons are read with a pair of parallel to serial latches The quadrature encoder output is fist sent to a 4 bit binary counter to make detection through the latch easier LCD modules are connected to the microprocessor via the same SPI interface The IR circuitry is there to drive the transmit LED and filter and condition signals from the receive section of the IR transceiver component Receiver Front End 25 1099 Rev 1 Signals from the antenna ports are filtered with a 3 9 order Chebyshev tracking filter Each pole of the tracking filter is connected to the same DC tracking control voltage The tracking voltage is derived from a quadratic equation in the microprocessor The coefficients of the quadratic are dependent on the frequency group of the receiver and are stored on the 190 045 microprocessor board The track tuning output of the microprocessor is D A converted and DC amplified The tracking control voltage is varied continuously from 0 14 VDC and tunes the filters center frequency over a
53. ghest frequency VCO fine tune voltage ranges from 1 to 4 VDC within each 1 3 of the tuning range of the board group A B C D E Use the control knob to very the receiver frequency while monitoring the VCO output and control voltages Synthesizer reference crystal should measure 32MHz 3kHz depending on trimmer position Note The oscillator will not function if the synthesizer has not received valid data 35 Tracking filters Isolate the filter by lifting one side of the input and output capacitors These capacitors are part of the filter Using spectrum analyzer with a tracking generator inject signal into the lifted end of the input capacitor Measure the output by connecting the spectrum analyzer to the lifted end of the output capacitor Insertion loss 4 6 dB 3dB Band Width 20 35MHz Insertion loss is lower at the receiver s higher frequencies higher tracking voltage Band Width is lower for the lower frequency bands better filter Q Rotate the control knob to very the tuning frequency Verify the filter is centered on the desired frequency and tracks frequency with minimal change to filter response shape Verify tracking voltage increases with frequency 1 14V typ air wound filter coils are the same for the same board group All trim caps are the same value and must be set to maximum value at the start of the filter tuning procedure Entering the RFFilter submenu automatically places 14VD
54. h pair of input lines to pass and also drives the yellow LEDs on the front panel showing which selection is made The pair of input line that pass through the analog switch are applied to a differential amplifier to remove noise and passed to an adjustable gain stage The gain stage which is adjusted by the volume control has a gain range of to 14dB The output of the gain stage is applied to the output driver section The output driver section consists of four parallel sections of 33178 opamp in a non inverting unity gain configuration Each channel left right is driven by a pair of these drivers through a 100 Ohm build out resistor each One of the output drivers is connected to the distortion detection circuit The distortion detection circuit uses a high gain differential stage to compare the input of the driver to its output Any difference in signal is distortion and is amplified by this stage The output is full wave rectified and averaged with a fast attack slow release RC network This voltage is used to drive the gate of a MOSFET When the distortion is significant the voltage rises to a point where the MOSFET turns on and lights a red LED on the front panel Operating Range System Specifications Min Typical Max Unit Notes Approximate Frequency Ranges 518 865 MHz Country dependent Signal to Noise Ratio A weighted 100
55. ions DO NOT defeat the safety purpose of the ground ing type plug The third prong is provided for your safety When the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet PROTECT the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point of exit from the apparatus USE only attachments accessories specified by the manufacturer USE only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over UNPLUG this apparatus during lightning storms or when unused for long periods of time REFER all servicing to qualified service person nel Servicing is required when the apparatus has been damaged in any way such as when the pow er supply cord or plug has been damaged liquid has been spilled or objects have fallen into the ap paratus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped CAUTION Observe precautions when handling this static sensitive device 25 1099 Rev 1 Disassembly WIRING DIAGRAM BROWN u entere 9 CHASSIS STUD Sue CHASSIS STUC DETAIL TYP IT YE
56. level meter and a Networking Interface connector for computer control and monitoring The receiver shall have a volume control and an adjustable noise squelch control The system shall be the Shure UHF R Wireless 25 1099 Rev 1 42 REPLACEMENT PARTS AND DRAWINGS The following comments apply to the parts list and the schematics Resistors Unless otherwise noted all resistors are surface mounted with 1 10 W rating and 196 tolerance Capacitors Unless otherwise noted non polarized capacitors are surface mount NPO dialectric types with a 100 V capacity and a 5 tolerance and polarized capacitors are tantalum types UR4 MODEL VARIATION COUNTRY CODE FREQUENCY RANGE COUNTRY DESIGNATION PCB NUMBER ANTENNA BEZEL H4 518 000 MHZ TO 578 000 MHZ US CANADA 200H4047 UA820H4 65A8599 HAE 518 000 MHZ TO 578 000 MHZ EUROPE 200H4E047 UA820H4 65J8599 J5 578 000 MHZ TO 607 975 MHZ US CANADA 200J5047 UA820J 65B8599 J5 614 025 MHZ TO 638 000 MHZ US CANADA 200J5047 UA820J 65B8599 J5E 578 00 MHZ TO 638 00 MHZ EUROPE 200J5E047 UA820J 65K8599 L3 638 000 MHZ TO 698 000 MHZ US CANADA 200L3047 UA820L3 65C8599 L3E 638 000 MHZ TO 698 000 MHZ EUROPE 200L3E047 UA820L3 65H8599 Q5 740 000 MHZ TO 814 000 MHZ EUROPE 200Q5047 UA820Q 65B8599 Q6 740 125 MHZ TO 751 875 MHZ KOREA 200Q6047 UA820Q 65F8599 99 740 000 MHZ TO 805 975 MHZ US CANADA 200Q9047 8200 6518599 910 740 000 MHZ 797
57. m IF 44 to 48 dBm Measure the following by isolating the mixer and driving the LO port from a generator at 7dBm 25 1099 Rev 1 Double balanced mixer Double balanced mixer RF 500 MHz RF 860 MHz Conversion Loss 7 dB 7 8 dB Isolation RF IF 30 2 dB 28 3 dB Isolation LO IF 35 1 dB 32 5 dB Isolation LO RF 38 0 dB 37 3 dB RF 1dB compression point 0 6 dBm 1 0 dBm Input IP3 9 dBm RF1 520MHz 10dBm RF2 521MHz 10dbm Input IP3 IF to intermod ratio in dB 2 RF input level in dBm 37 1 IF With 50dBm at the antenna ports DC voltage and RF power levels as indicated on the schematic Lift one side of the inductors that match the input and output of the saw filter to 500hms Use a tracking generator to sweep the filter and verify the response is centered at 110 6 MHz with insertion loss lt 4dB Remove the parts connecting the input and output of the MMIC amplifier Sweep the amp with a tracking generator and it has gain gt 12dB at 110 6 MHz The output capacitor of the discrete design second image filter is used to match to the second mixer To sweep this filter change the output capacitor to the same value as the input capacitor This will make the filter 50 Ohms in and out 279 279 LO and Detector With 50dBm at the antenna ports DC voltage and RF power levels as indicated on the schematic Verify the performance of the 2 IF b
58. m analyzer input to I 13 Adjust CV19 to maximize the spectrum analyzer power at fo Adjust CV18 to maximize the spectrum analyzer power at fo Adjust CV20 to maximize the spectrum analyzer power at f Readjust CV21 to maximize the spectrum analyzer power at f 18 dBm typ 22 CHANNEL 2 15 LO ALIGNMENT 1 Connect the spectrum analyzer input to 279 IF test point 1 100 Near FL 14 2 Set the spectrum analyzer as follows Center frequency to 10 7MHz Span to 100KHz Amplitude to 0 dBm 3 Adjust synthesizer crystal trimmer CV17 to center the 2nd frequency at 10 7MHz 1KHz The spec trum analyzer power at 10 7MHz is 9dBm typ CHANNEL 2B QUADRATURE COIL ALIGNMENT 1 Set RF signal generator as follows Amplitude to 40dBm Modulation to ON Modulation FM Modulating frequency to 1KHz Deviation to 38KHz 2 Connect the audio analyzer input to 604 Pin 7 of IC 600 3 Adjust L75 to maximize audio analyzer SINAD reading gt 50dB 4 SetRF generator Amplitude to 100 dBm UR4D 5 Engage Audio Analyzer A weighting 6 Verify audio analyzer SINAD reading A weighted is gt 12dB CHANNEL 2A QUADRATURE COIL ALIGNMENT 1 Connect the RF signal generator to antenna port A Using a short piece lt 1m of 50 coax 2 Set RF signal generator as follows Amplitude to 40dBm Modulation to ON Modulation FM Modulating frequency to 1KHz Deviation to 38KHz 3 Connectthe audio analyzer input to 1 601 Pin 1
59. m consists of all of the hardware needed to receive the wireless radio signal and convert it into audio It can be broken down into several sub components the antenna system the front end mixer 15 IF gnd IF and detector Each has an important part to play in determining the overall performance of the product The UR4 receiver has two BNC input connectors and will be supplied with a pair of detachable 1 2 wave antennas that can be remoted using accessory 50 Ohm cables if desired Both single and dual receivers will use Shure s MARCAD diversity for unsurpassed protection against signal dropouts UR4S and UR4D sections are located on the 190 044 main board Each receiver channel in a UR4 system contains two RF sections referred to as sections A and B Dual channel systems like the will contain 4 RF sections and will be referred to by CH1A CH1B CH2A and CH2B Single channel systems like the UR4S will use the and CH2B part of the 190 044 main board RF signals enter the UR4 receiver at the BNC ports labeled Antenna A In and Antenna B In The receiver provides 12 4 150 mA at each antenna port for use with external RF amplifiers Up to two external line amps or one line amp and one active antenna can be driven from each antenna port Power to the antenna ports can be removed via jumper settings on the 190 044 main board UR4D systems passively split the signals present at each antenna port and send them equally to channels
60. mplitude Frequency Response Test 1 Ox gv m coq Measured output of receiver should be 2 2 dBu OdBV 1 Save this level pressing ratio button on audio analyzer Set RF generator FM rate to 100Hz modulation Measured output of receiver should be 8 2 dB 2 relative to 1kHz measurement Set RF generator FM rate to 10kHz modulation Measured output of receiver should 12 5 dB 2 relative to 1 2 measurement Distortion amp Squelch Test 25 1099 Rev 1 1 Disengage ratio button and engage the distortion button on Audio Analyzer Set RF signal generator FM rate to 1Khz Verify distortion measures less than 5 Verify unit squelches at 90dbm Reset receiver tonekey detection to ON IMPORTANT SAFETY INSTRUCTIONS 1 READ these instructions 11 ONLY USE attachments accessories specified by the manufacturer 2 KEEP these instructions 12 USE only with a cart stand tripod bracket or table 3 HEED all warnings specified by the manufacturer or sold with the 4 FOLLOW all instructions apparatus When a cart is used use caution when 3 CLEAN ONY RO pe moving the cart apparatus combination to avoid 7 DO NOT block any ventilation openings Install in accordance with the manufac from b turer s instructions 13 UNPLUG this apparatus during lightning storms or when unused for long periods of 8 DO NOT install near any heat sources such as
61. mputer Network Interface Ethernet USB RJ45 USB Series B Receptacle USB IF logo is a trademark of Universal Serial Bus Implementers Forum Inc GND Lift 1 4 Monitor headphone 500 1 4 Phone 2000 TROUBLESHOOTING Troubleshooting and Service features To aid in troubleshooting DC bias voltages and typical RF and Audio levels are indicated at various points in the schematic deviation of RF section For the follo RF levels assume 50dBm input at the antenna port and no modulation Audio levels assume 28KHz a 1KHz tone wing tests place the receiver into calibration mode This mode allows the control knob to actively adjust the received frequency Setup and Entering Calibration menu Changing frequency VCO MMIC and Synt 25 1099 Rev 1 While turning receiver on press and hold the ENTER button and the Top NAVAGATE button closest to the enter button Continue holding until the display stops changing Exit to the main menu Press the Audio navigate button to enter the calibration menu Bands Band limits amp RF metering response Each receiver board group A B C D E may be used for more than one frequency band This band is indicated by the receiver model number and may be a subset of the PCB s total tuning range During the tuning proce dure each PCB is tuned for maximum tuning range and then software limited to the desired frequency band Bands may be
62. n external 32 MHz crystal The synthesizer contains an integrated prescaler phase detector and charge pump The charge pump gain is set to 5mA and feeds a second order lowpass loop filter The PLL is designed for 600 Hz open loop bandwidth and phase margin of 80 degrees The 600 Hz bandwidth was chosen to minimize phase noise as well as low frequency transient responses 80 degree phase margin insures stability of the loop and flattens the FM noise of the VCO The VCO output approximately 0 dBm is lowpass filtered with a 5th order Chebyshev filter to reduce harmonics 14 dB of gain and additional 5th order harmonic filtering are then provided The LO signal is then split to the 15t mixers in RF sections A and B 13 and 2 d IF stages FM detector 25 1099 Rev 1 The first IF is output from the double balanced mixer and filtered with a narrow band 110 6 MHz SAW filter A high dynamic range MMIC amplifier then provides 13 dB of low noise IF gain The amplifier output is filtered with a second order Chebyshev bandpass filter to improve 274 image rejection The first IF is mixed with 99 9MHz from the 279 LO to produce the 279 IF frequency of 10 7 MHz The 219 LO is formed from 3 overtone crystal and discreet Colpitts oscillator A second order Chebyshev bandpass filter is used to insure high spectral purity of the 279 LO signal LO output is split to provide 2dBm injection to the 279 mixers in RF sections A and B The second IF
63. ng ref 45 kHz deviation gt 100 dB A weighted Signal Polarity Positive pressure on microphone diaphragm or positive voltage applied to tip of 2 phone plug produces positive voltage on XLR output pin 2 with respect to XLR pin and on the tip of the 1 4 inch output jack System Distortion ref 45 kHz deviation 1 kHz modulation 0 396 Total Harmonic Distortion typical Power Requirements UR4D UR4S 100 240 Vac 50 60 Hz Current Drain UR4S 0 8 Amps max Operating Temperature Range 18 to 57 C 0910 4135 NOTE Battery characteristics may limit this range NOTE Electrical safety approval is based on a maximum ambient temperature of 35 95 F Overall Dimensions UR4S UR4D 43 5 mm H x 482 6 mm W x 366 mm D 1 718 x 19 000 x 14 385 in Net Weight 0845 4 94 kg 10 9 Ibs UR4D 5 14 kg 11 3 Ibs Housing UR4S UR4D Galvanized steel Compliance Information Units tested Notes US FCC Pt15B 13 Q9 Emissions Dual Receivers Canada RSS 123 H4 L3 Q9 Spurious emissions Dual Receivers 301 489 1 Emissions immunity Dual Receiver Europe M TJ p srHecevers 300 422 1 2 H4E L3E R9A Spurious emissions EIN Dual Receivers GB 8898 2001 China GB 13837 2003 Q10 Emissions CISPR 13 amp 22 EN 61000 3 GB 17625 1 2003 2 reports from DLS Will accept Elite Dual Receivers Japan CISPR 13 ABJ CISPR 1
64. nomy Band B J5E Europe 578 000 638 000 L3 US Canada Europe 638 000 698 000 D Q5 Europe 740 000 814 000 D Q6 Korea 740 125 751 875 D Q9 US Canada 740 000 805 975 D Q10 China 740 000 797 900 ABJ Japan 779 125 Band A 787 875 Band A uses A24 transmitters Excludes D Switchable between 797 125 Band 805875 dnd ieee Band A and Band B 806 125 Band B 809 750 806 125 809 750 MHZ E R9A Europe 790 000 865 000 NOTE This Radio equipment Is Intended for use In musical professional entertainment and similar applications This Radio aparatus may be capable of operating on some frequencies not authorized in your region Please contact your national authority to obtain information on authorized frequencies and RF power levels for wireless microphone products RF Carrier Frequency Range 518 865 MHz depending on region Audio Frequency Response 40 18 000 Hz 1 dB NOTE Overall system frequency response depends on the microphone element Modulation FM 45 kHz max deviation compander system with pre and de emphasis RF Power Output See table above Dynamic Range gt 110 dB A weighted Image Rejection 110 dB typical RF Sensitivity UR4S UR4D 110 dBm Typical 107 dBm Typical 12 dB SINAD 12 dB SINAD 105 dBm Typical 102 dBm Typical 30 dB SINAD 30 dB SINAD 25 1099 Rev 1 32 Spurious Rejection 90 dB typical Ultimate Quieti
65. nse of the first stage is NOT measured at the output of the opamp Rather it is taken after the 16 5k resistor acale dart 39 Troubleshooting the section is best done by tuning both channels of dual receiver to the same frequency and comparing voltages are different points The THAT 4320 has a few built in opamps that perform different functions The one that uses pins 2 3 amp 4 sums the three DC control signals for the VCA The opamp on the output of the VCA also has the de emphasis network applied The intended curve is shown below normalized for low frequencies Mechanical Specifications Overall Dimensions 44 mm H x 488 mm W x 366 mm D 1 72 in x 19 000 in x 14 39 in Weight UR4S 4 8 kg 10 6 Ibs UR4D 5 0 kg 11 0 Ibs Housing Galvanized steel Antenna 1 2 wavelength semi rigid PCB mount 25 1099 Rev 1 40 5 25 1099 Rev 1 41 Furnished Accessories Antenna Combiners and Accessories Microphone Stand Adapter UR2 WA371 Antennas and receivers must be from the same frequency Zipper Bag UR1 26A13 d MN Zipper Bag UR 264 Antenna Extension fe 2705 Antennas and cables for use with the UA845 can also be used Hardware Kit Locking Connector WA340 with stand
66. of IC 601 Adjust L52 to maximize audio analyzer SINAD reading gt 50dB 5 Set RF generator Amplitude to 100 dBm UR4D gt 6 Verify audio analyzer SINAD reading A weighted is gt 12dB 25 1099 Rev 1 23 CHANNEL 2A RF LEVEL INDICATION AND OVER LOAD LED ALIGNMENT Bos om 12 Set the receiver frequency to Set the RF signal generator frequency to Turn off modulation from the RF signal generator Through the Navigate menu select Audio gt Meter gt RSSI Press the Get Navigate key Set RF signal generator Amplitude to 90dBm Press the Get Navigate key Set RF signal generator Amplitude to 85 Press the Get Navigate key Set RF signal generator Amplitude to 80dBm Press the Get Navigate key Set RF signal generator Amplitude to 75dBm Press the Get Navigate key Set RF signal generator Amplitude to 70dBm Press the Get Navigate key Set RF signal generator Amplitude to 504 Press the Get Navigate key Set RF signal generator Amplitude to 25dBm Press the Get Navigate key Verify all RF LED lit on corresponding channel CHANNEL 2B RF LEVEL INDICATION AND OVERLOAD LED ALIGNMENT 25 1099 Rev 1 1 2 9 10 Connect the RF signal generator to antenna port B Using a short piece 1m of 50 coax Set RF signal generator Amplitude to 90dBm Press the Get Navigate key Set RF signal generator Amplitude to 85dBm Press the Get Navigate key Set RF signal
67. off Below that the signals are compared such that if one channel is 6dB better than the other the noisier channel is turned off The rectifiers caps are slightly biased 40mV to avoid excessive channel switching when both channels are low in noise content The output of the comparator drives the analog switches mentioned above They are also available as inputs to the microprocessor to be used to determine LED display status The output of the MARCAD summing junction feeds the tonekey detection circuitry Tonekey is a crystal referenced 32kHz pilot tone added to the audio sent from the transmitter The level of the tonekey is amplitude shift keyed ASK to encode data relating to various transmitter settings and battery level To detect the presence of tonekey the base band first passes through a pair of opamp based band pass filters 16 See the block diagram above These filters strip off most all of the base band audio and high frequency noise The signal at this point is rectified and applied to an ADC so that the data can be read by the microprocessor Because the filter Q is only 16 however the signal to noise is not good enough for robust tonekey muting operation Noise bursts can cause false tonekey detection To solve that problem an additional band pass filter stage using a 32kHz tuning fork crystal is used in parallel The crystal filter has a very high 8000 which gives a very good signal to noise ratio The output of the crystal filter
68. one can lift one side of the 100pF prior to the noise trim opamp and inject a signal 20dBV from a generator Measure the output of the opamp corresponding to each stage The sweep graphs should look similar to the simulation plot below Prequency Ei Y 38 Tonekey Detection Apply an accurate 32kHz tone from an Audio Precision or ESG generator at 5kHz deviation to either RF channel The RMS voltage levels should match those on the schematic To check performance of the pre conditioning bandpass filter first remove any RF Apply an audio generator signal 20dBV to the input of the MARCAD summing amplifier e g 180 Without any RF the switches will be off isolating the preceding opamps from the generator Measure the output of the opamp corresponding to each stage and compare the curves to the simulated curves below A RX TKfilter dat VDB Stagel VDB Stage2 Prequency Lowpass Filter 25 1099 Rev 1 The lowpass filter is used to limit high frequency noise and remove tonekey from affecting the expansion The output i e 1407 1607 is also the audio deviation reference point as is noted on the schematic With no RF applied to the receiver the tonekey switch will be open This allows one to apply signal directly to the input of the three stage filter Using a generator set to OdBV one can follow the response of the filter through the stages and compare the results to the simulation graph below The respo
69. ork Pa rameters on page 10 NOTE Dual receivers use a single IP address which may be set through either LCD interface Existing UHF Network Installations Both Shure s UHF R receivers and legacy UHF receivers can be networked to the same PC and accessed using the latest Wireless Workbench software ETHERNET 25 1099 Rev 1 7 Theory of Operation and Design Top Level Architecture UR4D mic line switch 4 14 Ground lift Headphone Switch 190 043 n LEDS 14 Antenna Receiver Channel 1 I Q 1 Monitor A 190 044 2 Volume RF section A Audio section Clip I Splitter 4 0000 pe Y 2 29 RF section B gt Audio section B o E oO a 8 d ta 5 o Wee Micro processor Display 190 045 190 046 Ethernet m o six 5 8 E 9 a 2 Antenna Receiver Channel 2 5 B 190 044 c RF section Audio section 5 x H Splitter RF section gt Audio section B XLR To 190 044 iq Power
70. ow at both turn on and turn off to keep the stable and reduce DC pops and thumps Front panel audio metering is accomplished by looking at the signal at two locations and applying a representative DC voltage to ADCs The first location is immediately prior to the expander The signal is full wave rectified and scaled for the ADC The rectifier has a fast attack to represent the peak response of the transmitted signal The second point is taken from the output of the RMS detector This DC signal is proportional to the power response of the transmitted signal This signal is scaled and sent to another ADC The microprocessor uses the information from both converters to display the appropriate LEDs Following the expander is the output stage Because the expander uses lower supply rails 5VDC gain is applied to scale the signal up to match the clip points of the expander with the clip points of the output stages 15VDC Output is provided on both phone jack as well as XLR The output on the 14 jack is an impedance balanced configuration The signal is buffered and applied to the tip connection via a 200 Ohm build out and phantom protection capacitor The ring connection is made in the same manner but is not driven with signal This configuration gives all the noise immunity benefits of a balanced connection when used as such with the ability to use an unbalanced connection guitar applications without shorting an output driver
71. s finished it displays the group with the most open channels 2 If you wish turn the Control wheel to change groups The number of open channels for each group is displayed 3 Press the flashing ENTER button to set all receivers to open channels in that group NOTE The group scan feature only works for receivers in the same frequency band For example if you did a group scan on a H4 band receiver all H4 band receivers would be set up but not J5 band receivers Multiple Receivers Not Networked If your receivers are not networked or in different bands the group scan cannot automatically set their group and channel settings However you can still take advantage of the group scan feature to find the group with the most open channels and the channel scan feature to find open channels in that group Find the group with the most open channels Perform a group scan using the steps for a networked receiver above However make a note of the selected group before pressing the flashing ENTER button to accept it Set the receivers to open channels in that group Perform a channel scan on the remaining receivers using the steps for a single receiver above Make sure to select the same group for each receiver before performing the channel scan IMPORTANT After setting the channel for the first receiver immediately sync the transmitter for that receiver and leave it on so that the next receiver detects that channel during its
72. s when making RF measurements Press and hold the enter button and the top Navigate button closest to the enter button while powering the receiver ON Continue holding until the display stops changing Note The following menu is not present following a normal power up sequence Press the exit button to return to the main menu Select RF from the navigate menu Set RF signal generator as follows Amplitude to 10 Modulation to OFF Frequency to f see table above Set the spectrum analyzer as follows e Frequency to fg see table above Spanto 1 MHZ Amplitude to 20dBm Set the receiver frequency to fo 21 VCO TUNING CHANNEL 2 Note VCO must be calibrated before tuning the preselect filters 1 2 3 T Remove HF section shield cover Through the Navigate menu select Audio gt RF gt VcoCal Follow the directions on the receiver s display The receiver is automatically tuning to the frequency shown in the display Adjust the control knob on the receiver until 1Vdc 0 1V is measured at 76 IC 14 PIN 3 then press the enter button to save the value Adjust the control knob on the receiver until 2 5Vdc 0 1V is measured at 76 then press the enter button Adjust the control knob on the receiver until 4Vdc 0 1V is measured at 76 then press the enter button Press enter to save and then exit the VCO calibration menu PRESELECTOR amp IMAGE REJ
73. stage utilizes an integrated circuit mixer and amplifier The output of the second mixer is bandpass filtered at 10 7 MHz with two 280kHz wide ceramic filters RF overload detection is provided by lightly coupling the output of the first ceramic filter to a zero bias diode detector The DC output of the diode detector is calibrated to indicate the presence of antenna signals greater than 25 dBm The filtered IF signal is fed to the ICs amplifier section Two additional 10 7MHz filters are provided after the amplifier to minimize adjacent channel interference The final stage of the RF section consists of a quadrature detector IC The filtered 2nd F signal is input to the detector s internal limiter A DC signal proportional to the IF input level is produced at each detector s RSSI output The RSSI output is calibrated and used to drive the receivers RF signal level LEDs The detectors quadrature phase shift is produced by an adjustable external quad coil Demodulated baseband signals are then routed to the Audio A Audio B Noise A and Noise B inputs of the audio section for additional processing Audio Section Audio Block Diagram gt pe Audio A ps Tonekey v Mute LPF 5 Audio B va ERES Tonekey Headphone Noisea gt i M rcm Noise B gt 25 1099 Rev 1 The base band audio signal output from the FM detectors is first affected by thermistor network It was found
74. tering is accomplished by a combination of two DC signals sent to corresponding ADCs The first is a full wave peak detection tapped off just before the expander This signal is used to give the user an idea of how transient signals such as guitar are propagating through the system The second DC signal is derived from the output of the RMS detector portion of the expander The RMS detector output is representative of the power contained in the signal averaged over a short period of time as well as how the compander is working The microprocessor measures these two inputs and displays the appropriate LED output on the front panel The signal at the audio output is tapped and sent to the headphone monitor as a balanced pair to avoid noise pickup The headphone amp board has a D flip flop connected to the push button on the volume control The flip flop toggles a bank of analog switches to select between the two channels on off the case of a URAS The signal passes through a differential amplifier to a user adjustable gain stage to 14dB The output of the gain stage is presented to the output drivers and one input to the distortion detection circuit The output drivers consist of four parallel sections from 33178 opamps two sections for the left and two for the right output Each driver section feeds out with 100 Ohms for a total output impedance of 50 Ohms One of the opamps feeding the left channel provides the second input for the distortion det
75. that the output of the detectors varies approximately 1dB across operating temperature Since the companding process approaches a 5 1 ratio this variation is effectively multiplied The thermistor network helps to mitigate the varience Each audio signal is then applied to a trimmable opamp gain stage 21dB 3dB These trims are considered the deviation trim pot The output of these two opamps each pass through a 200 Ohm resistor and an analog switch to a high impedance summing junction The analog switches are controlled by the MARCAD circuitry described below The effect is that either or both channels can be turned on and the same audio level will be present at the output of the summing stage provided both audio channels have the same signal The MARCAD circuitry provides both noise squelching against a fixed reference as well as diversity switching The noise outputs A amp B are taken from the two FM detectors A three stage multi pole band pass filter is used to look only at the signal content around 100 kHz 60kHz BW The amount of noise present is relative to the quality of the received signal Each channel A amp B is trimmed for a specific level using a low power carrier The carrier amplitude is adjusted to provide 35 dB SINAD audio output The A and B filtered noise output are both rectified and compared against both each other and a reference squelch level If either channel is higher than the preset squelch level that channel is turned
76. xt channel in that group Follow these steps to use the channel scan and group scan features 25 1099 Rev 1 5 Automatic Frequency Selection Before you begin Install the receivers in the location where they will be used and power them on Mute all inputs on mixing devices connected to receivers Turn off all bodypack or handheld transmitters for the systems you are setting up Turn on potential sources of interference such as other wireless systems or devices computers CD players effects processors and digital rack equipment so they are operating as they would be during the presentation or performance Single Receiver 1 Select Radio Scan Chan Scan using the Navigate keys on the receiver LCD interface 2 Turn the Control wheel to select a group 3 Press Chan Scan The display indicates that the receiver is searching Once it has finished it displays the selected channel 4 Press the flashing ENTER button to accept the suggested channel 5 Sync the transmitter see page 15 Networked or Dual Receivers With networked or dual receivers you can take advantage of the group scan feature to set group and channel settings for all the receivers at the same time See page 7 for instructions on networking Perform a group scan from any receiver 1 Select Radio Scan Group Scan using the Navigate keys on the receiver LCD interface The display indicates that the receiver is searching Scan In Progress Once it ha
77. y shown in the display Adjust the control knob on the receiver until 1Vdc 0 1V is measured at 76 IC 14 PIN 3 then press the enter button to save the value Adjust the control knob on the receiver until 2 5Vdc 0 1V is measured at 76 then press the enter button Adjust the control knob on the receiver until 4Vdc 0 1V is measured at 76 then press the enter button Press enter to save and then exit the VCO calibration menu PRESELECTOR amp IMAGE REJECTION FILTER ALIGNMENT SETUP 1 2 3 Through the Navigate menu select Audio gt RF gt Filter Verify that the receiver provides 14VDC to 23 U6 pin 1 Use a DVM for this measurement Connect the RF signal generator to antenna port A Using a short piece 1m of 50 O coax CHANNEL 1A PRESELECTOR FILTER ALIGNMENT pe Connect the spectrum analyzer input to 16 Adjust CV28 to maximize the spectrum analyzer power at fp Adjust CV29 to maximize the spectrum analyzer power at fo Adjust CV27 to maximize the spectrum analyzer power at fo CHANNEL 1A IMAGE REJECTION FILTER ALIGNMENT 25 1099 Rev 1 Connect the spectrum analyzer input to I 9 Adjust CV2 to maximize the spectrum analyzer power at fy Adjust CV1 to maximize the spectrum analyzer power at fp Adjust to maximize the spectrum analyzer power at fp Readjust CV29 to maximize the spectrum analyzer power at f 18 dBm typ 25 CHANNEL 1B PRESELCTOR FILTER
78. y removing the input capacitor to the second mixer Inject the second mixer with 110 6 MHz from a generator Measure the sensitivity of the second IF section at the output of the detector using 1000pF de emphasis capacitor The second IF sensitivity should be gt 107 dBm for 12 dB SINAD AUDIO SECTION To aid in troubleshooting DC bias voltages and typical RF and Audio levels are indicated at various points in the schematic RF levels assume 50dBm input at the antenna port and no modulation Audio levels assume 28KHz deviation of a 1KHz tone It is often required to enter the Radio Squelch Tonekey menu and turn off tonekey detection Deviation Trim With RF applied to the appropriate channel check for signal at the output of the detector pin 6 The signal level with 28kHz deviation of a 1kHz tone should be around 12dBV The deviation stage should be adding around 2088 of gain The signal can be followed through the MARCAD switches and the switch buffer The blue LEDs on the front panel indicate which of the MARCAD switches are open provided tonekey detection is turned off A properly tuned receiver will have exactly 8 80dBV at the output of the lowpass filter 1407 1607 for either antenna Noise detection MARCAD 25 1099 Rev 1 To ensure the MARCAD detector treats each receiver channel equally the unit is tuned such that the noise output levels are matched at a specific audio SINAD level To check the filter performance

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