Operators Manual
Contents
1. Camera Mounted Transmitter RFX CMT OPERATORS MANUAL Copyright 2005 RF Central RFX CMT LAST REV Dec 2006 Page 1 of 24 CENTRAL CONTENTS 1 GENERAL SAFETY INFORMATION d INEME UE 4 12 Maximum RF Power Density 222222222 000 5 DONEC Ic 5 2 INTRODUCTION c 6 SPECIFICATIONS prerio ena aa aE a 8 4 SYSTEM OPERA TION e 9 4 1 Camera 9 4 2 Operator Controls MOTLU nee eie 9 4 2 1 initialization Ment 9 42 2 EM 9 423 Ch Frequency 12 424 etm 12 4 25 Audio 1 12 4 2 6 Audio 2 12 4 2 7 Status 13 43 Status Meter 13 4 4 System Configuration Engineering 13 4 4 1 13 4 4 2 FW Inventory 13 44 3 Video Input Video FOIT rere nte dak xod nega ua npe es ur eeu vex2. volatile memory of the front panel unit and can only be upgraded by the factory RFX CMT LAST REV Dec 2006 Page 22 of 24 CENTRAL 8 Appendix A MPEG Encoder Parameter Sets Note The following parameters are typical for the transmitter and are issued for guidance only Some transmitters may have different configurations according to individual customer requirements Set Part Number Rate COFDM MPEG Video Video Low Audio Mbit s Mode Rate LPF Delay Rate Mbit Mode kbit 0 PBSW TDVP 18 096257 64 QAM 422P ML 16 59 No No 192 0303 05 00 1 2 1 32 GOP4 1 PBSW TDVP 18 096257 64 SP ML 11 81 No Yes 192 0303 05 01 1 2 1 32 Infinite GOP 2 PBSW TDVP 12 06417 64 QAM MP ML 10 00 Yes No 192 0303 05 02 1 2 1 32 GOP4 3 PBSW TDVP 12 06417 64 QAM SP ML Infinite 8 00 Yes Yes 160 0303 05 03 1 2 1 32 GOP Intra slice 4 PBSW TDVP 9 048128 QPSK 422P ML 7 79 Yes No 192 0303 05 04 3 4 1 32 GOP4 5 PBSW TDVP 9 048128 QPSK SP ML Infinite 6 00 Yes Yes 192 0303 05 05 3 4 1 32 GOP Intra slice 6 PBSW TDVP 6 032086 QPSK SP ML 4 94 Yes No 128 0303 05 06 1 2 1 32 Infinite GOP 7 PBSW TDVP 6 032086 QPSK MP ML 4 94 Yes No 192 0303 05 07 1 2 1 32 GOP4 RFX CMT LAST REV Dec 2006 Page 23 of 24 9 Appendix Table of DVB T non hierarchical bit rates Modulation Bit rate Mbit s at each guard interval symbol fraction QPSK 7 1 32 1 16 6 03 58
3. Modulation mode QPSK 16QAM 64QAM Code rate 1 2 2 3 3 4 5 6 7 8 Guard interval 1 32 1 16 1 8 Data rate 4 976471 to 31 668449 Mbit s The encoder menu also selects the MPEG profile 4 2 2 4 2 0 and SP ML low delay Pre programmed encoder parameter sets can vary according to individual customer requirements a separate sheet is included in the documentation accompanying the equipment when shipped from the factory As a guide a typical set of 16 pre set parameters is included in Appendix A Section 8 4 2 5 Audio 1 Menu The Audio menus are split into two levels Select Input and Set Level The A buttons and Enter are used to select the required audio sub menu The audio input can be set for either Line or Mic input selecting Mic gives a fixed 20aB gain There is also a level adjustment providing a 20dB adjustment in 0 5dB steps This level adjustment is intended to cater for variations in camera audio output levels it is NOT intended to use these adjustments to set microphone sound level It is assumed that the mic pre amp and limiter within the camera is used for this purpose 4 2 6 Audio 2 Menu As 4 2 5 above but for setting the Audio 2 input and level RFX CMT LAST REV Dec 2006 Page 12 of 24 CENTRAL 4 2 7 Status Menu The status menu is used to confirm the condition of the RFX CMT If the Status LED is red indicating a fault or warning the Status menu will indicate the nature of the problem The
4. Video cable cameram an s battery belt Audio cable RFX CMT LAST REV Dec 2006 Page 6 of 24 OUTPUT POWER CAMERA BATTERY AMPLIFIER INTERFACE CLIP CENTRAL REA CMT COMPONENT VIDEO External Views of the RFX CMT RFX CMT LAST REV Dec 2006 Page 7 of 24 Frequency Selection Transmit Antenna Modulation Modulation Modes Data Rate Bandwidth Encoding Options Latenc Video I nput Audio I nput Power Requirements Mechanical nterface Size Weight Environmental 3 SPECIFICATIONS 1 3 5GHz band 300MHz standard bandwidth Wider bandwidths available to special order Up to 16 pre set channels or tuning in 0 5 2 steps via side mounted panel control 100mW or higher subject to customer requirements RF Central Omni Directional 4dBi gain nom COFDM DVB T 2k QPSK 16QAM 64QAM FEC 1 2 3 2 4 2 6 Guard interval 1 16 1 8 1 4 Menu selectable via side mounted panel control 4 98 to 31 7 Mbit s 8MHz 7MHz amp 6MHz available MPEG 2 4 2 0 4 2 2 high quality DVB standard selectable to less than two frames minimum Tx to Rx Digital SDI 270Mbit s Analog YUV Y C component composite video PAL NTSC 2 x analog inputs mic line selectable Available with interface plates to accommodate Anton Bauer IDX and other batteries to be specified at time of order or 11 16VDC 18W via standard 4 pin XLR socket Transmitter normally mounts between battery and
5. e Audio Video Encoder PBAB TDAV 0301 e COFDM Modulator PBAB TDVM 0303 e RF Power Amplifier PBAB TDPA 0801 Display System Controller PBAB TDDB 0101 The superior RF performance of the RFX CMT when combined with an RF Central receiver is such that it typically requires only a single receive point with Fan beam antenna for most normal OB locations including sports stadiums 7 1 Block diagram Analog Audio 1 Analog Audio 2 Video Input CVBS YC YUV SDI Clip On Block Diagram i extreme RFX CMT LAST REV Dec 2006 Page 19 of 24 CENTRAL 7 2 Audio Video Encoder The Encoder board consists of the following main functions SDI to Digital deserializer Converts the SMPTE 259M C serial digital video input to an 8 bit parallel digital video bus Analog to Digital Video Converter 10 bit over sampling ADC Takes either Composite Video 75 O 1v p p CVBS YC or YUV inputs in either PAL NTSC format or converts to an 8 bit parallel digital video bus Analog to Digital Audio Converter 48kHz 24 bit Two high impedance analog inputs Audio 1 or left channel Audio 2 or right channel The two channels are first buffered by a variable gain stage to cater for either Mic or Line level inputs A switchable 20dB stage is also included to cater for low level Mic inputs The two audio channels are then converted into an 125 serial data stream FPGA Selects the required 8 bit parallel digital video bus from either the S
6. A V buttons are used to scroll through the various functions Video Input a valid video input is present TS Present the MPEG encoder is generating Transport Stream TS Rate TS data rate matches the modulator data rate Synth Locked the RF synthesizer is locked to correct frequency PA Enabled Disabled the RF PA is powered or disabled RF Output greater than 14dBm is present on the output 4 3 Status Monitoring There is a red green status LED indicating the condition of the RFX CMT if a fault or warning exists the LED will indicate Red and the Status menu will indicate the nature of the fault warning During initialization of the unit the Status LED will be off The Status LED is capable of flashing RED to indicate a warning or flashing GREEN to indicate no video input This is due to GREEN Video Input Check the camera is switched on and the video lead is correctly connected RED The PA is turned off To disable the RF Power Amplifier the C and lt are pressed as the RFX CMT is switched on This allows the transmit frequency to be checked before the PA is switched on The PA can be re enabled by re cycling the power 4 4 System Configuration Engineering Menu The Engineering menu provides the method of hardware configuration No user adjustments or setup is provided internally The engineering menu is entered by pressing the lt and C buttons simultaneously for 10seconds then releasing the C
7. As a precaution set the manually selectable frequency of the Receiver to the working frequency With Two Box receivers the Receiver Head and Control units may be operated at distances up to 600 meters apart RF Central triax cable is supplied in standard lengths of 100 and 200 meters and will plug together to create the lengths required Check that the necessary lengths of triax interconnecting cable are available and that the cable and cable connectors are in serviceable condition Whenever practical set up the system and trial it before leaving for site to ensure that all components of the system are working Checking at base where adjustments and corrective actions can be made will pay off when setting up at site RFX CMT LAST REV Dec 2006 Page 16 of 24 CENTRAL 6 CONNECTOR PIN OUTS 6 1 SDI CVBS Video BNC SDI or composite video blanking amp sync CVBS input Switched via controller dependant upon Video Input Selection See 4 4 3 75Q BNC connector 6 2 Video Connector Composite CVBS YC YUV 6Pin Lemo Plug FGG 1B 306 CLAD62Z Pin CVBS YC YUV 1 OV Y Ov Y Ov 2 5 Y Y 3 0 4 C U 5 V Ov 6 V 6 3 Audio Connector Line Mic Hi Z 5 Pin Lemo Plug FGG 1B 305 CLAD62Z Pin Function 1 Screen 2 Chi 3 Ch1 4 Ch2 5 Ch2 6 4 Power Connector 9 18V DC 18W power only This connector can be used to take power f
8. anyone else to do so Worked examples Antenna ______ __ ansmitter Power SW Gain dBi Gamma paw aw DN RAD o 05 s MINIMUM SAFE DISTANCE METERS RFX CMT LAST REV Dec 2006 Page 4 of 24 CENTRAL 1 2 Maximum RF Power Density Limits The RF Radiation Power Density limit figure recommended by RF Central is based upon guideline levels published in a IEEE standard C95 1 1999 IEEE Standard for Safety Levels with respect to Human Exposure to Radio Frequency Electromagnetic Fields 3 KHz to 300 GHz b Guidelines for Limiting Exposure to Time varying Electric Magnetic amp Electromagnetic Fields up to 300 GHz published in 1998 by the Secretariat of the International Commission on Non lonizing Radiation Protection ICNIRP Both documents define guideline RF power density limits for Controlled and Uncontrolled environments An uncontrolled environment is defined as one in which the person subjected to the RF radiation may be unaware of and has no control over the radiation energy received The uncontrolled environment conditions can arise even in the best regulated operations and for this reason the limits defined for the uncontrolled environment have been assumed for the RF Central recommended limit Documents a and b also show the RF power density guidelines to be frequency dependent Different power density frequency characteristics are presented in the two documents To avoid complexity an
9. battery interface plate 6 3 x 5 1 x 2 1 inches 2 1 Ibs including antenna Temperature 4 to 122 F Altitude 14 500 ft Humidity 95 humidity long term RFX CMT LAST REV Dec 2006 Page 8 of 24 CENTRAL 4 SYSTEM OPERATION 41 Camera Interfaces The RFX CMT can be supplied with one of two battery and camera interfaces e Sony V Block IDX e Anton Bauer Gold Mount These provide a flexible and versatile mounting system suitable for a wide range of cameras and battery options The RFX CMT is first mounted onto the camera rear battery interface If required an appropriate battery can then be docked onto the rear of the RFX CMT transmitter The video and audio cables must then be connected between the camera and the RFX CMT see 4 4 3 and 4 4 4 for details of the hardware configuration via the Control Panel If a battery is docked onto the rear of the RFX CMT no external DC power lead is required A separate lead is only required if a battery belt or external power supply is used Care should be taken to prevent damage to an external power supply if a battery is docked since current can be taken FROM the Power Connector 4 2 Operator Controls Menus The RFX CMT is configured using an LCD display and six push buttons These are arranged as four navigation buttons V 4 Enter and Clear The Enter button is used to store the modified parameter in non volatile memory this parameter will then be used to co
10. mao 14 4 4 4 Audio qoi eer 14 C COME rbd RR 14 5 PREPARING FOR 15 51 The RFX CMT Camera 15 52 THE Receiving ESgBIDITIBDLE bh uk e tg box ubi etd te onmes 15 07 GONNECTOR PN ESSERE 17 SDI CVBS ooo C 17 6 2 Video CODlIGCIOE usc oio etie i Pete Heri 17 6 3 I 93551 5 EP 17 6 4 Power ConneCt r E EO 17 A s uscite 18 7 MODULE DESCRIPTIONS lt lt 0 npa pect oo Dpe b peque niQepapenMpapapesi 19 r MEE dior 19 7 2 EUG OGY ecce 20 Pad 21 74 Power 21 79 ooo 22 8 Appendix A MPEG Encoder Parameter 23 9 Appendix B Table of DVB T non hierarchical bit rates 24 The information contained in this manual remains the property of RF Central and may not be used disclosed or reproduced in any other form whatsoever without the prior written permission of RF Central RF Central reserves the right to alter the equipment and specification appertaining to the equipment described in this manual without notification RFX CMT LAST REV Dec 2006 Page 2 of 24 CENTRAL
11. the RFX CMT can be powered up with the PA disabled To disable the RF Power Amplifier the and lt are pressed and held as the RFX CMT is switched on 5 2 The Receiving Equipment The transmitter may operate in conjunction with a variety of RF Central receivers Contact HF Central for receiver options When used with the RFX CMT transmitter the receiving equipment produces two audio channels analog mono and one stereo AES3 Video outputs include SDI and composite video outputs later RF Central receivers also have an ASI output If extension cables are necessary ensure that the connectors are compatible and of good quality to avoid problems at site RFX CMT LAST REV Dec 2006 Page 15 of 24 CENTRAL Check that the receiving antenna Receiver interfaces are clean and free from dust and other unwanted materials If tripods are to be used to mount the equipment make sure that some means of securing the tripod or of weighting it down is provided Gusty wind conditions may put installations at risk particularly when parabolic antenna dishes are to be used Make sure that all batteries if used are fully charged and whenever possible provide a spare with the cable to connect it to the Receiver Check that the Receiver channel frequencies are compatible with those of the RFX CMT Transmitter and set the channel selector switch to the channel number required The Receiver is labeled with channel number and frequency information
12. 1 GENERAL SAFETY INFORMATION The information that follows together with local site regulations should be studied by personnel concerned with the operation or maintenance of the equipment to ensure awareness of potential hazards WARNING RF Power Hazard High levels of RF power are present in the unit Exposure to RF or microwave power can cause burns and may be harmful to health Switch off supplies before removing covers or disconnecting any RF cables and before inspecting damaged cables or antennas Avoid standing in front of high gain antennas such as a dish and never look into the open end of a waveguide or cable where RF power may be present Users are strongly recommended to return any equipment that requires RF servicing to RF Central WARNING GaAs BeO Hazard Certain components inside the equipment contain Gallium Arsenide and Beryllium Oxide that are toxic substances Whilst safe to handle under normal circumstances individual Components must not be cut broken apart incinerated or chemically processed In the case of Beryllium Oxide a white ceramic material the principal hazard is from the dust or fumes which are carcinogenic if ingested inhaled or entering damaged skin Please consult your local authority before disposing of these components CAUTION Tantalum Capacitors When subjected to reverse or excess forward voltage ripple current or temperature these components may rupture and could potentially cause pers
13. 5 553 RFX CMT LAST REV Dec 2006 Page 24 of 24
14. DI deserializer or the video ADC for input to the MPEG2 encoder A relay is used to route the input from the BNC either SDI or CVBS to either the deserializer or ADC Selects the 125 from the ASE EBU receiver or the audio ADC for input to the MPEG2 encoder Generates the video test bars and audio test tones Microcontroller Writes control data and reads status data to from the MPEG2 Encoder 2 Encoder A suite of MPEG2 compliant compression techniques where the data bit rate is reduced by processing over multiple picture frames The absolute picture Intra frame is interleaved with pictures that are created using difference data Predicted frame with Bi directionally predicted frames 4 2 2 Only in conjunction with motion compensation thus low data rates down to 6 Mbps can be achieved A set of encoding parameters is loaded into the encoder at power up These are selected from one of the preset encoder memories See 4 2 4 DC Power Supplies Switching DC DC converters are used to generate the various supplies from the incoming 9 18V battery supply These include 2 5 3 3V 5V 8V and 5V supplies There are no field replaceable parts on the Encoder board If a fault occurs with the board contact RF Central for technical assistance RFX CMT LAST REV Dec 2006 Page 20 of 24 CENTRAL 7 3 COFDM Modulator The acronym COFDM stands for Coded Orthogonal Frequency Division Multiplexing a modulation scheme
15. Engineering mode by pressing C and lt buttons together 2 to 10 seconds Engineering Menu Key Enter E C Enter or Clear ENG MENU ENG MENU ENG MENU PROG CHANNELS VIDEO FORMAT AUDIO INPUT PROG CHANNEL VIDEO INPUT Ch1 2300 00MHz FP PAL AUDIO INPUT niece T AVE 0101 04 3 AP LEID AUDIO INPUT VIDEO INPUT NTSC PROG CHANNEL Ch16 2700 00MHz ides TONES 008 0301 01 24 AUDIO INPUT ENC FPGA 0301 01 TONES 18dB CH FREQ Manual 2456 00MHz RFX CMT Menu 2 RFX CMT LAST REV Dec 2006 Page 11 of 24 CENTRAL 4 2 3 Ch Frequency Menu This menu is used to select one of the sixteen pre programmed channels CH1 Ch16 or manual frequency selection The Man setting allows control of the transmit frequency in 0 5MHz steps within preset limits 0 5MHz steps are applicable to this version of the transmitter earlier versions have 1MHz steps The Enter button allows the 4 buttons to select the required digit the buttons then select the required value The Enter button then stores the value and returns to the Main menu 4 2 4 Encoder Menu Using the A V buttons this menu is used to select the required MPEG encoder operating parameters These are held in sixteen non volatile memories 0 15 The 4 buttons are used to display for the selected memory
16. ate internal test tones of either OdBFS or 18dBFS Signal routing is managed by the controller according to the selected options The buttons are used to select the required audio input type The Enter button then stores the value and returns to the Main menu 4 4 5 Temperature Provides a display of the internal temperature of the RFX CMT controller in degrees Celsius RFX CMT LAST REV Dec 2006 Page 14 of 24 CENTRAL 5 PREPARING FOR OPERATION EQUIPMENT PREPARATION Before leaving the equipment base to undertake an operation it is recommended that the following equipment checks be made 5 1 The RFX CMT Camera Back Check that the Camera Adapter is securely fastened to the camera Check that the batteries to be used are fully charged and that an emergency spare battery is available and fully charged Confirm the correct frequency is selected 4 2 3 Confirm the correct Encoder mode of operation is selected 4 2 4 Confirm the correct Audio level is selected 4 2 5 Confirm the correct Video input type is selected 4 4 3 If the camera is to be used with a cable connected antenna ensure that the cable is in good condition paying particular attention to the quality of the end connectors and their assembly status If extension cables are required make sure that the cable connectors are compatible or that the necessary back back connectors are to hand To enable the frequency to be checked without transmitting RF power
17. button 4 4 1 Prog Channels Each of the sixteen frequency channels can be independently allocated the required frequency with 0 5MHz resolution The buttons are used to select the Channel to be assigned The Enter button then allows the four A V lt P to edit the required frequency The Enter button then stores the value and returns to the Main menu 4 4 2 FW Inventory The firmware version for the encoder and main unit controller can be obtained from this menu RFX CMT LAST REV Dec 2006 Page 13 of 24 CENTRAL 4 4 3 Video Input Video Format The RFX CMT can accept either CVBS YC YUV inputs in either PAL 625 or NTSC 525 via the six pin LEMO Video input connector or can be set to generate internal test bar patterns of 75 100 or alternating between these two SDI digital video can also be input via the BNC 75Q connector if required this can also be used to input CVBS analog video Note The CVBS LEMO input Pin 1 amp 2 is paralleled with the BNC input when CVBS is selected only connect to either one of these inputs or an incorrect signal level may result Signal routing is managed by the controller according to the selected options The buttons are used to select the required video input type The Enter button then stores the value and returns to the Main menu 4 4 4 Audio Input The RFX CMT can accept two mono one stereo analog input s via the five pin LEMO Audio input connector or can set to gener
18. d to avoid areas of uncertainty RF Central recommends the use of a single power density limit across the frequency range 100 kHz to 300 GHz The 1w m power density limit we recommend satisfies the most stringent of the guidelines published to date Footnote IICNIRP document may be freely downloaded from the internet www icnirp de documents emfgadl pdf PDF file 1 3 Issue Status Issue Date Changes 1 0 10 24 05 Initial Issue 1 1 12 05 06 Revised to include enlarged encoder parameter sets encoder PIDs operator menus redrawn RFX CMT LAST REV Dec 2006 Page 5 of 24 CENTRAL 2 INTRODUCTION This manual is to be used in conjunction with the RFX CMT unit The RFX CMT Wireless Camera system is designed for all applications both indoor and outdoor in which a mobile camera is essential to the televised program production The unique modular design of the RFX CMT ensures complete flexibility to change compression and modulation techniques to suit each individual task required from the highest video quality to the most rugged of RF signal paths The system is comprised of the transmitter that contains an audio encoder video encoder COFDM modulator power supplies and an RF power amplifier Attached directly to this transmitter is an omni directional antenna Typical mounting configuration Digital low power transmission T a battery pack Optional DC input from
19. inal overall gain is 29dB thus the nominal RF input level is 9dBm The amplifier operates from a single 8 Volt supply Nominal operational supply current is 700mA The status of the PA is provided by LEDs to monitor RF output level green and DC present red and also monitored by the main controller and displayed as the status monitoring menu See 4 3 To ensure good RF practice when power is applied to the RFX CMT Camera back always make sure that there is a suitable load or antenna connected to the RF output RFX CMT LAST REV Dec 2006 Page 21 of 24 CENTRAL 7 5 Front Panel The Front Panel consists of a micro controller 16 character by 2 line LCD display operator switches and interface circuits The Front Panel is the main system controller for the unit All configuration of the unit hardware is from this board An two wire interface is used to communicate with all other intelligent devices within the unit This carries the command data and reads back status data from all boards within the unit At power up this board initializes all the other boards and during normal operation monitors all the major functions and reports any problems as part of the unit status All configuration parameters video settings audio settings MPEG encoder parameters frequencies etc are held on this board The MPEG parameter set required one of sixteen is selected via the Front Panel by the operator These parameter sets are held in the non
20. nfigure the RFX CMT and will also become the default value when next powered on The Cancel button can be used to exit a menu without storing the parameter in memory Various menu levels are provided to allow the operator to access the different hardware and operating parameters 4 2 1 Initialization Menu At switch on the status of the initialization is displayed If any errors are found with the initialization of the major functions Video Audio Encoder and Modulator an error message will be displayed During initialization the Status LED will be off 4 2 2 Main Menu This is the display screen during normal operation of the RFX CMT and indicates the TX frequency Channel number or Manual frequency and the current Encoder memory settings The A V buttons are used to select the required sub menus Ch Freq Encoder Audio1 Audio2 and Status the Enter button is then used to select The 4 buttons are used to display the current operational state During normal operation the Status LED will be green indicating healthy state of the RFX CMT RFX CMT LAST REV Dec 2006 Page 9 of 24 RFX CMT RF Central RFX CMT PHT dr aco NM CURRENT OPERATIONAL STATE OPS MENU E CH FREQ Ch1 2300 00MHz Select INPUT CH FREQ Ch 16 2300 00MHz CH FREQ Man 2446 00MHz CH FREQ Man 2456 00 2 RFX CMT Menu 1 LAST REV Dec 2006 Page 10 of 24 Enter
21. onal injury CAUTION This system contains MOS devices Electro Static Discharge ESD precautions should be employed to prevent accidental damage RFX CMT LAST REV Dec 2006 Page 3 of 24 CENTRAL 1 1 Health amp Safety Exposure to Non lonizing RF Radiation Safe Working Distances The safe working distance from a transmitting antenna may be calculated from the relationship Pr Gr D ATU W In which D safe working distance meters transmitter or combiner power output watts GR antenna gain ratio anti log gain dBi 10 W power density watts square meter The RF power density value is determined by reference to safety guidelines for exposure of the human body to non ionizing radiation It is important to note that the guidelines adopted differ throughout the world and are from time to time re issued with revised guidelines For RF Central use a maximum power density limit of 1w m is to be applied when calculating minimum safe working distances Appendix A refers Important Note It must be remembered that any transmitting equipment radiating power at frequencies of 100 KHz and higher has the potential to produce thermal and athermal effects upon the human bogy To be safe a Operators should not stand or walk in front of any antenna nor should they allow anyone else to do so b Operators should not operate any RF transmitter or power amplifier with any of its covers removed nor should they allow
22. rom the docked battery BA Max to power external cameras if the RFX CMT is not docked directly to the camera or feed power into the RFX CMT and then forward into the camera Note A diode is fitted to prevent the external power supply from back feeding into the battery RFX CMT LAST REV Dec 2006 Page 17 of 24 CENTRAL The power switch is used to control the RFX CMT only The power supply to the camera is always available from the battery interface or external power connector The camera on off switch should therefore be used to control the camera independently 4 Pin Lemo Plug FGG 1B 304 CLAD62Z Pin Function 1 OV 2 OV 3 12V 4 12V 6 5 Remote Connector RS232 19200 Baud 8 bit 1 stop No parity 4 Pin Lemo Plug FGG 0B 304 CLAD62Z Pin Function 1 OV 2 Tx Data out from unit 3 Rx Data into unit 4 OV RFX CMT LAST REV Dec 2006 Page 18 of 24 CENTRAL 7 MODULE DESCRIPTIONS The RFX CMT is based upon the highly successful dock able Wireless Camera system Internally it is very different Factory engineers have completely redesigned the RFX CMT to compress all the circuitry from five circuit boards onto two This greatly reduces space and weight compared with the original wireless product The result is a Digital Wireless Camera system which has exceptional RF performance is well balanced and easy to use The RFX CMT contains four circuit board assemblies
23. which is used by the DVB digital television system The COFDM modulator has been designed to take its input from the MPEG2 encoder This Transport stream is then modulated directly to the 2 2 5 3 5 4 5GHz band as appropriate This method reduces the occurrence of intermodulated harmonic frequencies and requires less up converters to reduce microphony The COFDM modulator RF output is via the SMB connector This output is then fed into the power amplifier via the short RF cable The nominal RF output level is 9dBm of the Modulator The modulator is automatically configured to match the data rate of the MPEG2 Encoder The modulator can support modulation schemes and data rates according to the chart in Appendix B section 9 operationally the modulator is configured according to preset parameter sets as described in 4 2 4 There are no field replaceable parts on the COFDM modulator If a fault occurs with the board please contact RF Central for technical assistance 7 4 Power Amplifier The function of the power amplifier is to amplify the signal from the COFDM modulator to a suitable level for transmission via the N type connector into the antenna The amplifier is required to be highly linear to accommodate the multiple carrier signal formats employed for digital system operation with very low distortion low intermodulation between carriers The nominal output power is 20dBm 100mW across the 2 2 5 3 5GHz band as appropriate Nom
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