User Manual
Contents
1. 1 etie eere neva ier E E Re TE PR EUR 10 5 0 SPECIFICATION icansssvcessssnesivusesacsusssvenssesecasseasssosnsasstecssessvesvenssveveessousevenss 11 M760REM USER 01R1 doc Page 2 of 12 10 March 2011 Microair Avionics M760REM User Manual 1 0 Introduction The M760REM USER describes installation data interface and operation of the transceiver The M760REM USER is a controlled document and may not be chnaged without the prior consent of Miroair Avionics 2 0 Development History The M760REM is a development of the Microair M760 Airband Transceiver This development replaces the human interface display assembly with a serial data interface The M760REM retains the serial data SL30 interface from the M760 for control over the active frequency standby frequency and dual monitor mode The serial data interface replaces all controls normally accessible from the display assembly with serial command codes A third party control unit can use these commands to maintain full control and operation of the M760REM Existing controls and interfaces such as the microphone audio in headphone audio out and PTT line remain unchanged from the original M760 M760REM USER 01R1 doc Page 3 of 12 10 March 2011 Microair Avionics M760REM User Manual 3 0 Installation The M760REM has no display or human interface control The unit can fixed to any appropriate aircraft structure which is inside the aircraf2. Aircraft Ground 12 Ground Aircraft Ground 14 Headphone Line level Audio typical 100mW into 6000hms BNC Aerial RG58C U 50 ohm Coaxial Cable wiring is connected by soldering to the DB15 connector Inspect the solder cup side of the DB15 carefully to determine the pin numbering 3 6 Wiring Diagram M760REM DB 15 CONNECTION MICROPHONE RS232 RX DATA IN NOT WIRED NOT WIRED RS232 TX DATA OUT NOT WIRED PTT NOT WIRED 11 16 VOLTS IN 11 16 VOLTS IN GROUND GROUND NOT WIRED HEADPHONE NOT WIRED 1 MICROPHONE 2 RS232 RX 3 4 5 RS232 TX 6 7 PTT POWER IN 14V MAX 5A FUSE GROUND 14 HEADPHONE 9 15 DB 15 CONNECTOR VIEWED FOR THE SIDE THE WIRES ARE SOLDERED TO M760REM USER 01R1 doc Page 5 of 12 10 March 2011 Microair Avionics M760REM User Manual 3 7 Technical Drawing 4 MOUNTING SLOTS 4 X 10 86 4 76 64 4 i M760REM USER 01R1 doc Page 6 of 12 10 March 2011 Microair Avionics M760REM User Manual 4 0 Transceiver Control The M760REM is fully controlled via the following connections RS232 Serial Data Interface e PTT line Microphone Audio Input Headphone Audio Output 41 RS232 Serial Data Interface Data Rate 9600 Baud 8 bit Parity none Stop bit Flow none The M760 supports the basic SL30 command set for transceiver control SL30 Command Description Input PMRRV24iidda lt chksm g
3. Microair Avionics M760REM User Manual 1 e MICROAIR AVIONICS M760REM 01 0 Airband VHF Transceiver User Manual M760REM USER 01R1 doc Page 1 of 12 10 March 2011 Microair Avionics M760REM User Manual Table of Contents 1 0 INTRODUCTION pisssisesscescusssvecesesecavesesssesnsessvnsssessestaensetexessoussssepsesvnessssennveseen 3 2 0 DEVELOPMENT HISTORY iiscushestvteevaM b4 Neh RP RAM EON E CI IR VER IR ORA TIRE E 3 3 0 INSTALLATION Pc tH 4 3 1 Mounting essene 4 3 2 eheu 4 3 3 LOCION sca ces R P 4 3 4 Antenna I REI OI E PR EIE 4 3 5 WIPE ac ccs T 5 3 6 Wiring DAS CUIR 5 3 7 Technical Drawing cree EH Ee epa ede LA aia anes 6 4 0 TRANSCEIVER CONTROL erba eor rb Y Yo Por eb YE Ye uP Fear Pera 7 4 1 5232 Serial nterfaCe erede ett erret HEP Tenes REC ERR TE duoc 7 4 1 1 Transceiver FUnction c cccccsssssssessseseeceeeceeecoeeenssensesnsesscensensesessesseeeeesaeeneesnsesnes 7 4 1 2 Statis ERE 8 4 1 3 Nadal 8 4 1 4 Report Squelch Level eese eene enne nennen enne nenne nennt ennnnn nene 9 4 2 10 4 3 Microphone Audio Input esses 10 4 4 Headphone Audio Output
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5. e If the squelch value is to be set to mid scale 64 decimal 40 hex ss would be 40 0x34 0x30 lt chksum gt the message checksum including message identifier through data characters The two digit checksum is generated by adding all values of valid characters together ignoring carry if any This value is converted into two encoded hex characters Ox30 0x3F A report to a command to set the squelch to mid scale will report the following string PMRRV32S407 lt CR gt lt LF gt The M760UAV will automatically report the new value of the squelch setting immediately following a Set Squelch Command There is approximately a 100mS delay between processing the command and reporting the new value M760REM USER 01R1 doc Page 9 of 12 10 March 2011 Microair Avionics M760REM User Manual 4 2 PTT Line The M760REM PTT line is designed to activate the transmitter when the PTT falls below 3Vdc The line may be completely grounded if required 4 3 Microphone Audio Input The M760REM provides a 9Vdc bias voltage for Electret or Amplified Dynamic microphone types Where the M760REM is to be connected to an Audio Panel type equipment the optimum input is line level P P The microphone gain and sidetone are M adjustable via trimpot s which can be accessed via the small hole s in the side of h the chassis 4 4 Headphone Audio Output The M760REM will deliver line level audio out The level is adjustable via the
6. ic Transceiver transmitting for longer than 45 seconds F Comm failure Transceiver inoperative S IMPORTANT NOTE red LED TX annunciator During this period the 6 After 45 seconds of transmission the 760 will flash the 7 transceiver status will default to S stuck mic 4 1 3 Set Squelch Level PMRRV51 lt ss gt lt chksum gt lt CR gt lt LF gt Where lt ss gt is the ASCII representation of the seven bit squelch value Each four bit nibble is added to 0x30 30 hex The most significant nibble is transmitted first Example If the squelch value is to be set to mid scale 64 decimal 40 hex ss would be 40 0x34 0x30 lt chksum gt the message checksum including message identifier through data characters The two digit checksum is generated by adding all values of valid characters together ignoring carry if any This value is converted into two encoded hex characters 0x30 Ox3F A command to set the squelch value to mid scale 0x40 would result in the command string of PMRRV51 gt 4 lt CR gt lt LF gt M760REM USER 01R1 doc Page 8 of 12 10 March 2011 Microair Avionics M760REM User Manual 4 1 4 Report Squelch Level PMRRV32S lt ss gt lt chksum gt lt CR gt lt LF gt Where S indicates it is the Squelch value is being reported lt ss gt is the ASCII representation of the seven bit squelch value Each four bit nibble is added to 0x30 30 hex The most significant nibble is transmitted first Exampl
7. t lt CR lt LF gt Request for Data Output Input PMRRV29mka lt chksm gt lt CR lt LF gt Set Standby Comm Frequency amp Function Input PMRRV42mka lt chksm gt lt CR lt LF gt Set Active Comm Frequency amp Function Input PMRRV51 lt ss gt lt chksm gt lt CR gt lt LF gt Set Squlech Level Output PMRRV32S lt ss gt lt chlsm gt lt CR gt lt LF gt Reports Squelch Level Output PMRRV20 lt chksm gt lt CR lt LF gt Reset function M760 ready for data Output PMRRV35mkmkas lt chksm gt lt CR lt LF gt Comm Transceiver Status 4 1 1 Transceiver Function In both the set standby and set active commands the field represents transceiver function N Normal M Monitor Transceiver receives and transmits on the active Transceiver receives on both active and standby and transmits on active 0 Unchanged Transceiver function setting not changed Hence it is possible for the external equipment if it supports these commands fully to change the active and standby frequencies and switch the M760Q in and out of monitor mode M760REM USER 01R1 doc Page 7 of 12 10 March 2011 Microair Avionics M760REM User Manual 4 1 2 Transceiver Status The Comm Transceiver Status command contains the field for the transceiver s status R Normal receive Normal receiver mode monitor function inactive M z Monitor service Monitor function active T Transmit enabled PTT button is down transmitting S Stuck m
8. t cabin The M760REM should be located clear of air vents or cabin heating and should not be subject to outside weather For pressurised aircraft the M760REM shall be located inside the pressure hull in a temperature controlled space 3 1 Mounting The M760REM has mounting flanges with four M4 x 10 5 32 x 3 8 slotted holes 3 2 Connection Electrical connection is made using a Sub D15 connector which is held in place using thumbscres or lock bolts 4 40 The RF connection is made using a 50 ohm BNC connector 3 3 Location The location of the M760REM should consider access to the adjustment trimpots for microphone gain sidetone level and headphone aduio level Consideration should also be given to the connector and cable bending radius for the wiring harness and coax cable 3 4 Antenna The M760REM is compatible with any TSO C37d C38d compliant Airband antenna The coaxial cable shall be 50 ohm eg RG58 RG400 M760REM USER 01R1 doc Page 4 of 12 10 March 2011 Microair Avionics M760REM User Manual 3 5 Wiring Microair recommends the use of the Mil Spec wiring for all lines and installaed in accordance with the techniques described in FAA AC43 13 2A Pilot Microphone Electret or amplified dynamic RS232 RX RS232 TX data in RS232 TX RS232 RX data out PTT lt 3Vdc to activate Power 14V do not exceed 16Vdc Power 14V do not exceed 16Vdc 11 Ground
9. trimpot which can be accessed via the small hole in the front plate M760REM USER 01R1 doc Page 10 of 12 10 March 2011 Microair Avionics M760REM User Manual 5 0 Specification Radio Type Channels Receiver Transmitter TX Frequency Stability Frequency Control Memories Priority Key Power consumption Input Voltage Power output Modulation VSWR Tolerance Receiver sensitivity Receiver Selectivity Microphone Types Headset volume output Temperature range Dimensions Weight Amplitude Modulation AM Aircraft Transceiver 760 channels 25KHz spacing TX 118 000 136 975MHz RX 108 000 139 975MHz RTCA DO 186B Class D RTCA DO 186B Class 4 0 4 ppm 0 00004 Microprocessor controlled phase lock loop voltage controlled oscillator 99 programmable memories Active amp Standby channels with Dual RX monitoring function Fast access to memory 25 typically 121 500MHz Receive no signal 100 mA Transmit 1 8 A 10 7 16 0 Volts dc Minimum operation 10 7V receive only 5 0 5 5 Watts carrier no modulation 70 nominal lt 5 1 gt 20dB SINAD 1 0uV 3 75KHz 3dB 8 75KHz 90dB Electret or Amplified Dynamic Adjustable up to 100mW output into 600 ohms 20 55 degrees Celsius W 87mm H 64mm D 119mm plus 35mm for harness W 3 4 2 5 D 4 7 plus 1 5 for harness 338 grams 13 ounces M760REM USER 01R1 doc Page 11 of 12 10 M
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