Rev. 4 Page F-3
P3501
GMA 35 Audio
Panel
COM 1
AUDIO IN HI
COM 1 AUDIO LO 10
9
COM 1 MIC AUDIO OUT HI
COM 1 MIC KEY OUT*
12
11
s
s
COM 2 AUDIO IN HI
COM 2 AUDIO LO 14
13
COM 2 MIC AUDIO OUT HI
COM 2 MIC KEY OUT* 30
15
s
COM 1 Transceiver
(Connected as COM 2)
s
Garmin
GTN 750
P
1003
500 Ω COM AUDIO HI
COM MIC AUDIO LO
COM MIC KEY
500 Ω COM AUDIO LO
7
18
20
11
COM MIC AUDIO HI5
COM 2 Transceiver
(Connected as COM 1)
Garmin
GNS 530W
P5002
500 Ω COM AUDIO HI
COM MIC AUDIO LO
COM MIC KEY
500 Ω COM AUDIO LO
7
19
18
4
COM MIC AUDIO HI6
NOTES:
1. ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED.
2. GROUND DESIGNATIONS: SHIELD BLOCK GROUND AIRFRAME GROUND
3. WHEN A SECOND COM RADIO IS INSTALLED WITH THE GTN 750 AND GMA 35, THE GTN 750
SHOULD BE
CONNECTED TO THE GMA 35 COM 2 PINS AND THE OTHER RADIO SHOULD BE CONNECTED TO COM 1
PINS. THIS
WILL PREVENT LOSS OF BOTH COM RADIOS IN THE EVENT THE GTN 750 LOSES RS-232 COMMUNICATION WITH
THE GMA 35. A FAILSAFE CIRCUIT IN THE GMA 35 CONNECTS THE PILOT’S HEADSET AND MICROPHONE DIRECTLY
TO COM 1 IN CASE POWER TO THE GMA 35 OR RS-232 COMMUNICATION WITH THE GTN 750
IS LOST. REFER TO
SECTION 5.5.4.8.2.1 FOR CONFIGURATION SETTINGS
. REFER TO SECTION 2.4.14 FOR ADDITIONAL
CONSIDERATIONS FOR FAILSAFE OPERATION.
4. THESE INPUTS CAN BE USED FOR ANALOG AUDIO SUCH AS ADF OR DME ANALOG AUDIO. THESE INPUTS ACCEPT
UP TO 15 MW INTO A 600 OHM LOAD. REFER TO SECTION 5.5.4.8.2.6 TO CONFIGURE EACH RECEIVER INPUT. DO
NOT USE THESE INPUTS FOR AUDIO SOURCES FOR WHICH LOSS WOULD BE CLASSIFIED AS MAJOR OR HIGHER
IN AC 23.1309-1E, SUCH AS TAWS AUDIO OR AUTOPILOT DISCONNECT TONE.
5. TO PREVENT COUPLED INTERFERENCE AND GROUND LOOPS FROM BEING INJECTED INTO THE AUDIO INPUTS,
GROUND THE SHIELDS AT ONLY ONE END.
s
3
GTN 750 Installation with Second COM
