User`s Manual Operations Manual Standard Definition Messenger
Contents
1. Name Meaning 16 QAM 16 state Quadrature Amplitude Modulation 64 QAM 64 state Quadrature Amplitude Modulation AN Audio Video AES Advanced Encryption System 32 bit ASI Asynchronous Serial Interface BDC or BDCC Block down converter COFDM Coded Orthogonal Frequency Division Multiplexing CVBS Y Composite video Luminance with S video Chroma video DIC Down Converter FEC Forward Error Correction GUI Graphical User Interface HD High Definition Input Output Kbaud Kilobaud per second Kbps Kilobits per second Mbps Megabits per second MER Modulation Error Rate MPEG Moving Picture Experts Group MSR Messenger Smart Receiver M2D Messenger Two Decoder M2T Messenger Two Transmitter M2L Messenger Two Link NTSC National Television System Committee PAL Phase Alternation Line QPSK Quadrature Phase Shift Keying RF Radio Frequency RX Receiver S N Signal to Noise Ratio THD Total Harmonic Distortion SD Standard Definition SDI Serial Digital Interface TX Transmitter VDC Volts Direct Current 0 1920606 Rev 1 8 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs 3 1 About the Manual Cobham User Manuals focus on providing the end user an easy to understand operational instructions to quickly setup and deploy the equipment The Cobham Technical Operation Manuals focus on the technical d2. Pin Signal Notes 1 RS232 Data Tx 2 RS232 Data Rx 3 RS232 GND 4 Not connected 5 SDA 2 C bus 6 SCL 1 2 C bus 7 CVBS Y Dual use input 1 Composite video in 2 Luminance in when used with S or Component Video Must be selected with Cobham s Status amp Control Software or through the front panel of the in line camera mount box 8 GND GND for composite video 9 Dual use input 1 Chroma video when used with S video 2 Pr red component when used with Component Video Must be selected with Cobham s Status amp Control Software or through the front panel of the in line camera mount box 10 GND GND for Chroma video Pr component 11 Pb Blue component when used with Component Video 12 GND GND for Pb component 13 GND GND 14 11 15Vdc Input power to unit 15 Not connected P1920606 Rev 1 15 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Pi Signal Notes 16 USB power Reset 45V 17 USB Data 18 USB Data 19 USB GND 20 29 Not connected 30 PA Shut Down Provides a TTL signal 3 to enable an external 31 RS232 Control Tx 32 RS232 Control Rx 33 RS232 GND 34 36 Not connected 37 Audio right 4 38 Audio right Pin 39 is connected to 38 for audio right channel input 39 Audio right line opt impedance of 600 ohms balance in microphone or line leve
3. P power input to the antenna in appropriate units e g mW ower gain of the antenna in the direction of interest relative to an isotropic radiator R distance to the center of radiation of the antenna appropriate units e g cm 0P1920606 Rev 1 6 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs NOTE The manufacturer is not responsible for any radio or TV interference caused by unauthorized modifications to this equipment Such modifications could void the user s authority to operate the equipment Do not substitute any antenna for the one supplied or recommended by the manufacturer The installer is responsible for ensuring that the proper antenna is installed Antenna minimum safe operating distances should be observed as stated in section 2 above It is the responsibility of the qualified end user of this intentional radiator to control the safe distances and exposure limits to bystanders DC power 12VDC to the unit should never be applied until the antenna or other suitable load has been attached to the device SMA RF output connector Safe operating procedures must be observed when unit is transmitting into an antenna see sections above 0P1920606 Rev 1 7 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Acronyms This section lists and describes the various acronyms used in this document
4. 0 x 1 76 in H 8 26 cmx 11 43cm x 447cm Weight 13 4 oz 379 9grams 8 9 Environmental Operational Temperature 10 to 70 C Humidity Up to 100 non condensing 0P1920606 Rev 1 24 of 29 GMS Inc doing busine obham Tactical Communications and Surveillance www cobham com tcs C Down Converter IF frequencies explained 9 1 IF Frequencies MSR receivers and many other digital receivers are capable of receiving direct frequencies in the range of approximately 49 MHz to 861 MHz If the transmitter is not in this range then a down converter also refer to a BDC block down converter is used to convert the frequency to this range The frequency out of the down converter is called the IF intermediate frequency which is fed to the receiver Down converters have a LO local oscillator which is mixed with the transmitter frequency M2T and converts it to the IF frequency MSR receivers need to know the LO local oscillator of the down converter and the RF frequency of the transmitter It then automatically calculates the IF frequency The IF frequency changes as the RF frequency changes However the LO remains constant On non GMS receivers it may be necessary to program the receiver with the IF frequency directly The user may have to do the simple math to arrive at the IF frequency so that it can be entered into the receiver The down converter LO must be known The math involve is as follows LO transmitter fr
5. Built in 4 2 0 MPEG 2 Video Encoder and MPEG 1 Layer Audio Encoder Coded Orthogonal Frequency Division Multiplexed COFDM Modulation Output Frequency 0 36 to 6 GHz In Bands Low Power Consumption Local and Remote Control Interfaces Rugged and Compact Portable Design 4 3 Theory of Operation The SDMT accepts Composite S Video Component video SDI ASI optional as well as up to two audio channels Microphone or line level The video and audio are compressed ASI data streams are passed through bypassing the MPEG encoder according to MPEG specifications Video MPEG 2 and Audio MPEG 1 layer II The MPEG 2 supports 4 2 0 Chroma sampling MP ML and SP ML profiles and maintains the 0P1920606 Rev 1 10 of 29 GMS Inc doing ham Tactical Communications and Surveillance www cobham com tcs original signal s video fidelity The audio and video program element streams are multiplexed with basic service data to indicate the service name into a DVB compliant Transport Stream TS The TS stream is then sent through a DVB T compliant FEC encoder and COFDM modulator This is output from the FPGA based modulator core as digital I Q signals that are converted to Analog I Q signals and applied to an I Q Modulator The LO that provides the carrier to this modulator comes from a low phase noise programmable synthesizer The modulated RF output of the modulator IC is sent through amplifier chain and ultimately output to the outside w
6. OUT SMA Connector DB 44 Connector and Power SW100 Frequency Select Switches Figure 2 SDMT C Connectors 6 1 1 SDMT C Connectors 6 1 1 1 RF Output The SDMT uses a female SMA bulkhead connector for its RF Output port Note Transmitters should not be powered on without a RF load Doing so could cause the output power amplifier to stop working A proper heat sink is also required 6 1 1 2 Input Output 1 0 The I O connector is a male high density DB 44 It provides the interface for external power audio analog video USB and RS 232 signals The SDMT has a separate RS232 channel labeled Control on the external breakout cable for control and monitoring the unit Cobham s SDMT Status amp Control software program as explained in section 6 3 1 3 makes use of the RS232 0P1920606 Rev 1 14 0f 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs control lines The RS 232 channel utilizes a 3 wire configuration The pin out for the I O connector is shown in Table 2 NOTE An additional RS232 channel labeled USER DATA is currently provided with the external breakout cable The USER Data RS232 channel is dedicated for low rate data to be transmitted along with the audio and video The USB connector is an alternate method of interfacing to the PC if DB 9 connectors are not available Table 2 1 0 DB 44 Connector Pin Out
7. above the range of the frequency band of the SDMT the transmitter will default to the high side of the frequency band If the switches are set for a frequency lower than the transmitter frequency band it will default to the low side of the frequency band 0P1920606 Rev 1 17 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs 6 2 SDMT S Connectors RF OUT SMA Connector SDI ASI Frequency Select Input BNC Switches Connector Connector I O and Power SW100 Figure 5 SDMT S Connectors 6 2 1 SDMT S Connectors 6 2 1 1 RF Ouptut The SDMT uses a female SMA bulkhead connector for its RF Output port Note Transmitters should not be powered on without a RF load Doing so could cause the output power amplifier to stop working A proper heat sink is also required 6 2 1 2 Input Output 1 0 The I O connector for the SDMT S is the same as for the SDMT C Refer to section 6 1 1 2 and Table 2 6 2 1 3 SDI ASI BNC Input Connector The BNC connector is provided for inserting SDI Serial Data Interface and ASI Asynchronous Serial Interface data The SDMT S can accept either SDI or ASI The selection for which input data stream is accepted is made through the Cobham Status amp Control software 0P1920606 Rev 1 18 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs 6 2 2 Frequency Select Switches Th
8. of a transient nature as a result of incidental passage through a location where exposure levels may be above general population uncontrolled limits see below as long as the exposed person has been made fully aware of the potential for exposure and can exercise control over his or her exposure by leaving the area or by some other appropriate means General population uncontrolled exposure limits apply to situations in which the general public may be exposed or in which persons who are exposed as a consequence of their employment may not be made fully aware of the potential for exposure or cannot exercise control over their exposure Therefore members of the general public would always be considered under this category when exposure is not employment related for example in the case of a telecommunications tower that exposes persons in a nearby residential area 0P1920606 Rev 1 5 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Exposure is based on upon the average time spent within the RF field with a given intensity field units in mW cm2 Hence it may be controlled or at least minimized by observing the safe distances and time exposed as shown in Table 1 These safe distances are calculated from equations predicting RF Fields with the following assumptions The transmitter maximum power is 23dBm 200 mW The antenna used has a 2dBi gain The transmitter is used
9. the SDMT C and SDMT S units 6 3 1 4 Power Switch An LED indicator rocker switch is provided for controlling power to the unit 6 3 1 5 LCD Display An optional LCD display with a front control panel is available for the inline camera mount unit Many of the control functions normally handled through the PC software interface can now be accessed directly with the front control panel The LCD can perform such functions as changing frequencies checking video lock status among many others 6 3 1 6 SDI ASI Input optional A BNC connector is provided for Serial Digital Interface or Asynchronous Digital Interface input data streams This input is only applicable to the SDMT S unit 0P1920606 Rev 1 20 of 29 obham Tactical Communications and Surveillance www cobham com tcs GMS Inc doing busin Software Overview if not extracted to document Configuration control and monitoring of the SDMT units are done by using Cobham s MS Windows based SDMT Status amp Control software program 8970908 This Graphical User Interface GUI program provides the end user with a straightforward way to interface with the SDMT unit During normal operation once a link is established the SDMT GUI does not need to be active and can be disconnected from the SDMT unit Refer to the Software Manual for further information 0P1920606 Rev 1 21 of 29 GMS Inc doing obham Tactical Communications and Surveillance www cobham co
10. 5 of the DB 15 connector The RS 232 channel utilizes a 3 wire configuration The pin out for I O connector is shown in Table 3 A USB connection is also provided if RS232 port is not available 0P1920606 Rev 1 19 of 29 GMS Tne doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Table 3 I O DB 15 Connector Pin Out Pin Notes 1 12Vde 2 RS232 Rx CTRL Relative to SDMT i e control data is input on this 3 RS232Tx CTRL Relative to SDMT i e control data is output on this pin 4 Not connected 5 RS232 GND ground for both RS232 Data and Control lines 6 T2C D 7 r2c_c 8 USB Reset 45V 9 USB Data 10 USB Data n USB GND 12 Not connected 13 RS232 Tx DATA 14 RS232 Rx DATA 15 RS232 GND 6 3 1 3 Video Input The SDMT in line camera enclosure uses female BNC connectors for video input Component Composite or S Video input is accepted J3 BNC connector marked Y COMP is a dual use input connector a Composite Video or b Luminance when used with Component video J2 BNC connector marked C Pr is a dual use input connector a Chroma when used with S Video or b Pr the red component minus the luminance information used with Component Video J8 BNC connector marked Pb is the blue component minus the luminance information used with Component Video These video inputs are applicable to
11. ES IN ACCORDANCE ETH THE EXPORT ADMINISTRATION RECULATIONS DIVERSI N CONTRARY TO US LAN PROMISED ED Postar wer Buc 10 T 5 Les 12 Leo Fons D 15 18 Luseneser ne 17 BEDS A A 19 Ass Remy J POWER a x 21 Nc I 1 US 2 9 25 2a Fone 25 one Ne one 29 one 50 one 31 Com a 3 55 Fone one al Z Cuo icin j Pam Y ot A Ren i a iuo temna Si A eo rad gue 44 Nt Ne BLK COBHAM FIGURE 1 ML ST CABLE WIRING n possc DIAGRAM CABLEMDTSDWTAET FULL BREAKOUT EX sl aient T 0P1920606 Rev 1 29 of 29 GMS Inc joing business as Cobham Tactical Commu and Surveillance www cobham com tcs
12. Operations Manual COBHAM The most important thing we build is trust Standard Definition Messenger Transmitter SDMT C SDMT S OPERATIONS MANUAL Cobham Tactical Communications and Surveillance 1916 Palomar Oaks Way Suite 100 Carlsbad CA 92008 Tel 760 496 0055 FAX 760 496 0057 0P1920606Rev1 13 2011 lof29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs ble of Contents 1 Important Warning and General Safety Information 1 1 General 1 2 RF Emissions 2 Acronyms 3 Introducti 4 General System Information 4 1 Overview 4 2 Key System Feature 4 3 Theory of Operatioi 5 Initial Checkout 5 1 Included Items 5 2 Getting Started 6 Hardware Overview 6 1 SDMT 6 1 1 SDMT C Connector 6 1 2 Frequency Select Switches 6 2 SDMT S Connectors 6 2 1 SDMT S Connectors 6 2 2 Frequency Select Switches 6 3 Inline Camera Unit Optional 6 3 1 SDMT Inline Camera Mount Connectors uu t 7 Software Overview if not extracted to another documen 8 Specifications 8 1 Video Encodin 8 2 Audio Encodin 8 3 Transport Stream 8 4 RS 232 Interfaces RCU USB 8 8 Physical Dimensions without mating connectors 8 9 Environmental 9 D C Down Converter IF frequencies explained 9 1 IF Frequencies 0 1920606 Rev 1 20f29 GMS Inc doing busin bham
13. Tactical Communications and Surveillance www cobham com tcs 9 2 Local and Remote Power for Down Converters 9 2 1 Remote Power 9 2 2 Local Power 10 Cable Losses 10 1 Coax Cable List of Tables Table 1 Safe Distances Table 2 I O DB 44 Connector Pin Out Table 3 I O DB 15 Connector Pin Out Table 4 DB 9 Connector Pin Out for the D List of Figures Figure 1 Basic SDML Setu Figure 2 SDMT C Connectoi Figure 3 Frequency Select Switches at 2 Figure 4 Frequency Select Switches at 924 MH Figure 5 SDMT S Connectors Figure 6 SDMT Inline Camera Uni Figure 7 BDC Connectors List of Appendices 28 N NN AAA 6 5 0 6 OocouuiasM Appendix A Bibliography Appendix Cable M2T External Breakout Cable 0P1920606 Rev 1 3 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Edited Revision Date Mai hanges from Previous version by 15Jul Added note when scrambling mode is changed transmitter will reboot X2E Jc 2010 x 5Apr Added FCC warnings extracted Status amp Control Software into 100 DRF 2011 M0168X1 updated Cobham branding 1 13 Initial Release conversion of 100 M0065X3 DRF 2011 P1920606 Rev 1 4of 29 GMS Tne doing business as Cobham Tactical Communications and Surveillance www cobham com tcs 1 1 Genera
14. arrangements are adequate to meet the requirements of VETA product e Operate within the environmental limits specified for the product The transmitter will generate considerable heat and it is the responsibility of the end user to properly heat sink the device before using e E lectro Static Discharge ESD precautions should be observed as a safe practice Only authorized trained personnel should open the product There are no functions that required the User to gain access to the interior of the product 0P1920606 Rev 1 9 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs General System Informati 4 1 Overview Cobham s Standard Definition Messenger Transmitter SDMT C is one of the smallest and lowest power consumption DVD T Digital Video Broadcasting Terrestrial compliant COFDM Coded Orthogonal Frequency Division Multiplexed transmitter available There are three SDMT models the SDMT C supports standard analog video and audio signals the SDMT S which adds an SDI interface and the SDMT A The SMDT A supports ASI Transport Stream inputs only Note that the MPEG Encoder is removed on this model These transmitters may be supplied as standalone products or may be configured in an optional Camera Box that is compatible with most professional cameras Additionally Cobham offers a wide variety of companion products required to form a complete link A Standard Definition Messe
15. e frequency select switches are the same as the SDMT C See section 6 1 2 above for the operational description 6 3 Inline Camera Unit Optional DB 15 Connector VO and Power BNC J2 video input RU ATE Chroma C when A2 used with S video Pr when used with component video BNC J3 Y COMP Composite video BNC J8 Pb when used input when used with component video with S or Component BNC J7 SDI or ASI input video RF Out Power ON OFF switch LCD panel with controls Figure 6 SDMT Inline Camera Unit 6 3 1 SDMT Inline Camera Mount Connectors There are four BNC connectors two audio XLR one DB 15 connector one N type connector and one rocker on off power switch located on the SDMT inline camera unit for interfacing the RF audio video power and RS 232 signals An optional LCD control front panel is also available Inline camera mount is shown in Figure 6 6 3 1 1 RF Output The SDMT in line camera enclosure uses a female N type connector flange mount for its RF Output port Note Transmitters should not be powered on without a RF load Doing so could cause the output power amplifier to stop working A proper heat sink is also required 6 3 1 2 Input Output 1 0 The I O connector is a female DB 15 It is used to provide the interface for RS 232 signals control and monitoring Cobham s SDMT Status amp Control software program makes use of the RS232 control lines pins 2 3 and
16. equency or transmitter frequency LO IF frequency For example it the transmitter is set for 2000 MHz and the LO of the down converter is 2800 MHz then the IF frequency is 800 MHz 2800 2000 800 The receiver will need to be set to 800 MHz to receive the transmitter frequency of 2000 MHz Each time the transmitter frequency is changed the IF must be re calculated and entered into the receiver It must also be mentioned as you may have noticed with the equation LO transmitter frequency or transmitter frequency LO that two answers are possible For example 2800 2000 800 or 2000 2800 800 The negative answer may indicate the receiver wants the signal to be inverted 9 2 Local and Remote Power for Down Converters Customers have the option of using remote or local power 9 2 1 Remote Power Remote power is provided from the MSR through the BNC connector from each of the tuners located on the rear panel Power is turned on through the software control application refer to the MSR online manual The 12Vdc provided from the receiver will travel through the coax cable to the D C If the D C is located relatively close to the receiver then using remote power makes sense However if the D C is located at great distances away from the receiver there may be excessive DC voltage drop in the coax cable due to cable resistances If this is the case then local DC power should be considered as discussed below If unsure of the DC voltage d
17. etails and setup of the equipment The Technical Manuals also provide a more in depth explanation of the settings and specifications of the equipment that technicians can use to verify the operational status 3 2 Warranty Cobham offers a 12 month standard product warranty During this period should the customer encounter a fault with the equipment we recommend the following course of action Check the support section of the website for information on that product and any software firmware upgrades e If fault persists call our support line and report the fault If fault persists and you are informed to return the product please obtain an RMA number from the Cobham support department or website and ship the equipment with the RMA number displayed and a description of the fault Please email the support section the airway bill consignment number for tracking purposes Depending on the nature of the fault Cobham endeavor to repair the equipment and return it to the customer within 14 days of the item arriving at our workshops Obviously it is impossible to cater for all types of faults and to manage 100 replacement part availability and delays are sometimes inevitable Please contact Cobham for details of packages that can be tailored to meet your individual needs whether they are service availability technical training local geographic support or dedicated spares holdings 3 3 Safe Operating Procedures Ensure that the power supply
18. in a fixed location The user and bystanders should remain beyond the distances from the antenna at all times as stated in Table 1 when the transmitter is operating for no longer than the time periods indicated keeping in mind this is the average time If any of the above variables change such as a higher gain antenna less or more power output from the transmitter additional transmitters used etc then the safe distances would need to be recalculated The user can either refer to the equations predicting RF Fields as noted in the above section or call contact Cobham for advice Table 1 Safe Distances Occupational General population RF Frequency controlled exposure uncontrolled exposure MHz um Safe Average EF Safe Average MEE Distance Time AES Distance Time cm min cm Min 1000 to 1500 33 28 6 0 67 62 30 1500 to 7000 5 22 1 5 SDMT Transmitter Power 0 2W 23 dBm Antenna Gain 2dbi The transmitter which can be operated in fixed or mobile applications is rated at 0 2W 23dBm RF power and is capable of harmful radiation if safe operating practices are not observed see sections above It should be noted that this device is an intentional radiator hence Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment PG S5 Fer where power density in appropriate units e g mW cm2
19. l The following information is presented to the operator to ensure awareness of potential harmful RF radio frequency exposure and general hazards With regards to potential harmful RF electromagnetic fields the text below is only a brief summary highlighting the possible risks and how to minimize exposure The summary is based on OET Bulletin 65 Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields 1 The user should carefully read and comprehend the following before operating the equipment and for additional in depth information refer to OET Bulletin 65 1 2 RF Emissions The FCC has set guidelines Cleveland Jr Sylvar amp Ulcek 1997 for evaluating exposure to RF emissions that the user must be aware of when operating Cobham s SDMT microwave transmitter The maximum power density allowed at 1500 7000 MHZ is 5mW cm2 for occupational controlled exposure and 1mW cm2 for general population uncontrolled exposure These are the limits for maximum permissible exposure MPE as called out in the FCC guidelines for the above mentioned frequencies 1 Occupational controlled exposure limits apply to situations in which persons are exposed as a consequence of their employment and in which those persons who are exposed have been made fully aware of the potential for exposure and can exercise control over their exposure Occupational controlled exposure limits also apply where exposure is
20. l 40 Audio right GND 41 Audio left 42 Audio left 7 Pin 43 is connected to pin 42 for audio left channel input 45 Audio left line opt impedance of 600 ohms balance in microphone or line level 44 Audio left GND 6 1 2 Frequency Select Switches There are four external rotary switches mounted into the chassis of the SDMT see Figure 2 amp Figure 5 They are used to control RF frequency selection manually Frequency selection can also be controlled through Cobham status amp control software see section 6 3 1 3 The rotary switches can be disabled or enabled using Cobham status amp control software The most significant switch SW100 represents 1000 MHz 0 9 units the second switch SW101 represents 100 MHz 0 9 units the third switch SW102 represents 10 MHz 0 9 units and the fourth switch SW103 represents 1 MHz 0 9 units Therefore the highest switch selection is 9999 MHz and the lowest is 0000 MHz For example with the switches in the positions shown in Figure 3 the frequency will read 2014 MHz 0P1920606 Rev 1 16 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Figure 3 Frequency Select Switches at 2014 MHz And with the switches in the positions shown in Figure 4 the frequency will read 924 MHz SW100 Figure 4 Frequency Select Switches at 924 MHz Note the following if the switches are positioned for a frequency
21. m tcs The following sections outline the overall specifications for the SDMT unit 8 1 Video Encoding Interfaces SDI optional Component Composite or S Video Input Standards NTSC or PAL Compression Standard MPEG 2 per ISO IEC 13818 2 Profiles MP ML SP ML Video Bit Rate 3 7 Mbps to 15 Mbps MP ML Chrominance Profile 4 2 0 Line Standard 525 or 625 Horizontal Resolution 704 pixels Vertical Resolution 576 625 line and 480 525 line System Latency end to end delay 198 mS with SDMT DDR combination in SP ML mode 8 2 Audio Encoding Analog Audio Dual Line Level or Mic Level Differential or Single Ended Clip Level 12 dBm Impedance 600 Ohms input impedance changeable to 2K Ohms Compression Standard MPEG layer II Audio Enable On or Off Bit Rates 256 Kbit s ch Sampling Frequency 32 kHz 44 1 kHz or 48 kHz THD lt 0 1 maximum Response 20 Hz to 12 kHz 0 25dB Crosstalk gt 55 dB minimum S N gt 60 dB RMS 8 3 Transport Stream Standard per ISO IEC 13818 1 Packet Size 188 byte Bit Rate Automatically set from active service settings ASI Input optional Allows MPEG2 transport stream to be inserted into the SDMT A and SDMT S units through the BNC connector 0P1920606 Rev 1 22 of 29 GMS Inc doing busin obham Tactical Communications and Surveillance www cobham com tcs 8 4 RS 232 Interfaces RCU USB Control Port 3 wire interface Tx Rx Gnd USB 1 0 RCU A remote po
22. nger Link SDML is formed when one of the SDMT models is combined with one of Cobham s Messenger Digital Receivers one or two external Down Converters antennas and a SD MPEG 2 decoder The SDML uses a robust digital modulation system known as Coded Orthogonal Frequency Division Multiplexed COFDM that provides frequency diversity and powerful Forward Error Correction FEC algorithms The SDML provides a robust wireless link that is effective against the multi path interference experienced by analog systems and provides crisp clear pictures in the most difficult of terrains Additionally the SDMT DDR Standard Definition Messenger Transmitter and Digital Diversity Receiver combination in SP ML mode can provide an end to end latency down to approx 198ms without the introduction of any further MPEG encoding artifacts This ensures that the picture you see is what is happening now crucial for applications such as sports coverage surveillance and law enforcement where personnel are reacting to real time events This manual provides information on how to operate each of the SDMT models as well as pertinent technical information related to the overall system Also refer to model identifier on line document at Cobham s website http www cobham com tcs for available frequency and power configurations along with available options 4 2 Key System Features e Component S Video amp Composite with Optional SDI ASI or ASI Only Interfaces e
23. onal capacitance Even when using a good coax cable such as RG59 U the attenuation of the signal can be significant For example RG59 U coax will drop approximately 2 dB per 100 feet at 50 MHz and 8 dB per 100 feet at 900 MHz The intermediate frequency IF in this system can fall between 49 MHz to 850 MHz An inline amplifier matching the cable losses should be considered if losses exceed 6 dB 0P1920606 Rev 1 27 of 29 GMS Inc doing obham Tactical Communications and Surveillance www cobham com tcs Appendix A Bibliography Cleveland Jr F Sylvar D M amp Ulcek J L 1997 August OET Bulletin 65Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields Retrieved March 30 2010 from Federal Communications Commission http www fcc gov Bureaus Engineering_Technology Documents bulletins oet65 oet65 pdf 0P1920606 Rev 1 28 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Appendix B Cable SDMT External Breakout Cable TES DRAWING 1S TME SOLE PROPERTY DE GMS INC EES RECEN ARP PROPRIETARY IRURE AND Eco ev DESCRIPTION BATE DRAWN CHRD PRO ENG ENG MGR WECH ENG ARE NOT TO SE COPIED OR OTHERWISE DUPLICATED Se DISCLOSED TO SEE SHEET FOR APPROVALS AND DEATES EXPORT ADMINISTRATION REGULATION EARY NOTICE Bits COMMODITIES TECHNOLOGY OR SOFTWARE ARE RON Tre UNITED STAT
24. orld Programmable attenuators in the RF processing chain provide signal leveling The transmitter is microprocessor controlled Normally the transmitter is controlled either through an RS 232 or USB interface via either GMS MS Windows control SW or a simple command line interface Local Frequency control is also available via rotary switches on the side of the housing 0P1920606 Rev 1 11 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Checkou 5 1 Included Items The standard SDMT kit includes the following items SDMT unit example Cobham part number SDMTCCBAONXXX SDMT full breakout cable Cobham part number 4009004 Power A V Data Control interfaces NOTE Based on customer application Cobham may deliver a receiving system additional cables and antennas Contact Cobham for further information The device is pre configured by Cobham prior to shipment based on customer requirements thus is ready to work right out of the box 5 2 Getting Started Prior to installing a SDMT unit into the desired target environment an initial checkout should be performed to ensure proper operation of the unit The initial checkout consists of configuring a basic SDML Standard Definition Messenger Link E Power Source Power Supply DVB T Video Source Monitor Figure 1 Basic SDML Setup Figure 1 shows a basic interconnection config
25. rop measure the DC voltage present using a DMM at the end of the coax cable run the D C normal operating voltage is approximately 12Vdc but can operate down to 10Vdc 9 2 2 Local Power Local power is provided by applying 12Vdc to pin 1 GND to pin 3 of the DB 9 connector located on the bottom of the D C The 12 Volt power supply must be able to source at least 500mA The power switch located on the side of the D C enables the user to control the ON OFF positions for local power If using local power then the remote power should be set to OFF 0P1920606 Rev 1 25 of 29 GMS Inc doing ham Tactical Communications and Surveillance www cobham com tcs Power Switch for Local Power BNC connector IF Frequency Output DB 9 connector Local Power Figure 7 BDC Connectors Table 4 DB 9 Connector Pin Out for the D C Pin Signal Notes 1 412Vdc Power supply must be able to source at least 500mA Voltage should not drop below 10Vdc 3 GND Power ground 2 4 9 NC Not Connected 1920606 Rev 1 26 of 29 GMS Tne doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Cable Losses 10 1 Coax Cable Cable losses must be taken into consideration if the D C is located a great distance from the receiver As mentioned above long cable runs can contribute to more resistance in the lines and also can contribute to signal attenuation because of the additi
26. rtable control unit is also available In addition a Data RS232 channel is available dedicated for low rate data to be transmitted along with the audio and video 8 5 COFDM RF Output Output Frequency 0 36 to 6 GHz In Bands Frequency step size is 500 KHz for all bands except S2 1999 2500MHz which is 250 KHz Bandwidth Selectable 6 7 or 8 MHz Output Power Up to100mW programmable 200mW on some models Connector SMA F Note Transmitters should not be powered on without a load Doing so could cause the output PA to stop working A proper heat sink is also required 8 6 Modulation Modulation Type COFDM w QPSK 16 QAM 64 QAM available with SDMT S and SDMT A units when ASI input is selected FEC 72 2 3 7 8 not all available SDMT configuration type dependent Guard Intervals 1 32 1 16 1 8 not all available SDMT configuration type dependent Spurious 504 Number of COFDM Carriers 2k COFDM MER gt 45dB Standard DVB T compliant 8 7 Power DC Input Voltage Range 9 to 15 VDC Power Consumption 8 5 Watts to 10 8watts SDMT configuration type dependent 8 8 Physical Dimensions without mating connectors SDMT C unit Size 325 W x 45 0 x 1 00 in H 8 26 cm x 11 43cm x 2 54cm Weight 10 69 oz 303 1 grams 0P1920606 Rev 1 23 of 29 GMS Inc doing busin ham Tactical Communications and Surveillance www cobham com tcs SDMT S A units Size 325 W x 45
27. uration to establish a wireless SDML NOTE Receivers down converters D C units and their associated hardware are sold separately As mentioned in 0P1920606 Rev 1 12 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs section 6 the SDMT may be shipped as a stand alone unit or mounted in an Inline Camera Mount box SDMT stand alone units require the use of Cobham s breakout cable to provide power and the necessary interfacing to communicate to the transmitter The Inline Camera Mount boxes require a 12 battery and most of the necessary communications can be done through the LCD front panel The steps necessary to set up the configuration shown in Figure 1 are shown below the differences between the Inline Camera Mount box and stand alone unit are noted where applicable 0P1920606 Rev 1 13 of 29 GMS Inc doing business as Cobham Tactical Communications and Surveillance www cobham com tcs Hardware Overview There are two basic transmitter configurations for the SDMT The SDMT C which accepts Composite S Video and Component Video The SDMT S which accepts Composite S Video Component Video SDI and ASI inputs In addition all two configurations of the SDMT can be mounted in an inline professional camera unit this is an optional enclosure for mounting the SDMT for professional camera applications The hardware for each configuration is shown below 6 1 SDMT C RF
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