Garmin GMA 245 Installation Manual

Also see for GMA 245: Pilot's guide

Contents

Garmin GMA 245 Installation Manual Manual pdf 70 page image

190-01879-11 GMA 245/245R Installation ManualRevision 6 Page C-1APPENDIX C INTERCONNECT DRAWINGSFigure C-1 Notes for Example Interconnect DrawingsGMA 245 INSTALLATION NOTES2. UNLESS OTHERWISE NOTED, ALL STRANDED WIRE MUST CONFORM TO MIL-W-22759/16 OR EQUIVALENT.UNLESS OTHERWISE NOTED, ALL SHIELDED WIRE MUST CONFORM TO MIL-C-27500 OR EQUIVALENT.3. UNLESS OTHERWISE NOTED, ALL WIRES ARE 22 AWG MINIMUM.4. SYMBOL DESIGNATIONS AND CONNECTOR GUIDANCE:SHIELDED 2 CONDUCTORWHTBLUSHIELDED 3 CONDUCTORTIP SLEEVERINGSTEREOPLUGTIP SLEEVEMONOPLUGNOTE 7TIP TIPRING RINGEVEELSEVEELSSTEREO PLUGINSERTED INTOJACKMONO PLUGINSERTED INTOJACKRING SHORTEDTO SLEEVEWHTBLUORNTIP (LEFT CHANNEL)RING (RIGHT CHANNEL)SLEEVE (LO)NOTE 5NOTE 7STEREO JACKHEADSET EAR SPEAKERTIP (*PTT)RING (MIC HI)SLEEVE (MIC LO)NOTE 5NOTE 7JACK HEADSET MICAIRCRAFT GROUNDSHIELD BLOCK GROUNDWIRE SPLICEMOMENTARY CONTACTPUSH BUTTONNOTE 5. AUDIO JACK ISOLATION DIAGRAMAIRCRAFT PANELSHOULDERWASHERFLAT INSULATEDWASHERFLAT METALWASHERMETALNUTAUDIOJACK5. ISOLATE JACK SLEEVE (MOUNTING NUT AND NUT PLATE) FROM AIRCRAFT CHASSIS.7. THE HEADSET EAR SPEAKER SLEEVE DIAMETER IS 0.25 INCH AND LARGER THAN THE HEADSET MIC SLEEVE DIAMETER 0.206 INCH.6. THE CONNECTION BETWEEN PTT AND THE MIC JACK TIP IS REQUIRED IF HAND MICS WILL BE USED. *DENOTES AN ACTIVE LOW SIGNAL.8. IF THE TRANSCIEVER HAS A SEPARATE RETURN FOR AUDIO IN AND AUDO OUT, CONNECT BOTH TO THE GMA AUDIO LO AT THE GMA.9. DO NOT CONNECT THE SPEAKER GROUND RETURN TO THE AIRCRAFT CHASSIS. THE GROUND RETURN MUST GO TO THE GMA.10. THE LIGHTING BUS VOLTAGE RANGE IS CONFIGURABLE FOR EITHER 14 OR 28 VOLT SYSTEMS. REFER TO INSTALL MANUAL CONFIGURATION OPTIONS.11. GARMIN RECOMMENDS USING STEREO HEADPHONES. IF MONO JACKS ARE DESIRED, GARMIN RECOMMENDS THE USE OF THE LEFTOUTPUT ONLY (LEAVE THE RIGHT CHANNEL UNCONNECTED). DO NOT CONNECT THE LEFT AND RIGHT CHANNELS TOGETHER.12. THE TELEPHONE INTERFACE MAY BE WIRED TO A FIXED MOUNTED TELEPHONE SOURCE (SHOWN) OR TO A SUITABLE JACK FORPORTABLE TELEPHONE.13. TRANSCEIVER INTERFACES CAN ALSO BE WIRED THROUGH SUITABLE JACKS AND CABLES TO HANDHELD COMS THAT HAVE HEADSET14. * DENOTES ACTIVE LOW.15. MONO ONLY HEADSET JACK CONNECTION DETAIL.16. USE A MINIMUM 10 WATT SPEAKER.1.UNLESS OTHERWISE INDICATED, ALL SHIELDS MUST BE TERMINATED AT THE GMA 245 END ONLY.ALL SHIELDS ARE TIED TO THE BACKSHELL USING RING TERMINALS. FOR GMA 245, USE THE RINGTERMINAL ADAPTERS PROVIDED FOR THE BACKSHELLS IN THE CONNECTOR KIT. FOR GMA 245R,CONNECT RING TERMINALS TO THE BACKSHELLS. FOR BOTH UNITS, #8 SCREWS, WASHERS, AND SPLITWASHERS ARE PROVIDED.ALL HEADSET, MICROPHONE, AND MUSIC PHONE JACKS MUST BE ELECTRICALLY ISOLATED FROM GROUND.REFER TO THE FIGURE ABOVE FOR HOW THE JACK IS ISOLATED. NOT ISOLATING WILL CAUSE GROUND LOOPS AND NOISE.INTERFACE CAPABILITY. THE HANDHELD'S HEADSET OUTPUT (LEFT CHANNEL ONLY IF STEREO) CONNECTS TO THE GMA'S COM AUDIOIN HI AND COM AUDIO LO PINS, THE HANDHELD'S MIC INPUT CONNECTS TO GMA'S COM MIC AUDIO OUT HI AND COM AUDIO LO PINS, ANDTHE HANDHELD'S PTT KEY CONNECTS TO GMA'S COM MIC KEY* OUT. SEE TRANSCEIVER'S INSTRUCTION MANUAL.TWISTED SHIELDED 3 CONDUCTORSHIELD FLOATSTWISTED SHIELDED 2 CONDUCTORSHIELD FLOATSTWISTED SHIELDED 3 CONDUCTORSHIELD TERMINATED TO SHIELD BLOCK OF DSUB USING RING TERMINALSTWISTED SHIELDED 2 CONDUCTORSHIELD TERMINATED TO SHIELD BLOCK OF DSUB USING RING TERMINALSUSE 8 OHM SPEAKER FOR 28 VOLT SYSTEMS ONLY.USE 4 OHM SPEAKER FOR 14 OR 28 VOLT SYSTEMS.17. ICS KEY INPUTS ARE ALSO COMPATIBLE WITH TWO-STAGE PTT KEYS IN WHICH THE FIRST DETENT ACTIVATES THE ICS KEY AND THESECOND DETENT ACTIVATES THE TRANSCEIVER PTT (CREW ONLY) FOR THAT POSITION.18. PLUGGING A MONORAIL HEADSET INTO A STEREO JACK SHORTS THE RIGHT CHANNEL OUTPUT TO GROUND. THIS WILL CAUSE EXCESS CURRENT TO BEDRAWN. THIS WILL NOT DAMAGE THE GMA, BUT IS NOT RECOMMENDED. THE GMA WILL DETECT THE SHORTED CHANNEL AND SHUT THE AUDIO TO THE SHORTEDCHANNEL OFF TO PREVENT THE INTERNAL AMPLIFIER FROM DRIVING A SIGNAL INTO A SHORT.NOTE 1819. THE MUSIC LO SIGNALS ARE NOT THE SAME REFERENCE AS OTHER GROUNDS. THE MUSIC LO SIGNALS ARE PART OF A DIFFERENTIAL PAIR WITH THERIGHT AND LEFT SIGNALS. IF THE MUSIC LO SIGNAL IS TIED TO A GROUND, THE MUSIC WILL CONTAIN NOISE, AND THE AUDIO QUALITY WILL BE DEGRADED.20. IF THE GMA IS AT THE END OF THE CAN BUS, ADD GPN 011-03002-00 CAN TERMINATION KIT TO THE CAN BUS AS SHOWN.ONLY INSTALL CAN TERMINATION KIT IF THE GMA IS AT THE END OF THE CAN BUS. THE TERMINATION STUB LENGTH SHOULD NOT EXCEED 0.3 METERS.IT IS RECOMMENDED THAT THE GMA BE LOCATED IN THE MIDDLE OF THE CAN BUS SO A TERMINATION KIT IS NOT NEEDED.THE TERMINATION KIT IS AN OPTIONAL ACCESSORY.