Manual Garmin GTN 650 (page 389 of 412) (English)

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190-01007-A3 GTN 6XX/7XX AML STC Installation Manual

Rev. 4 Page F-3

P3501

GMA 35 Audio

Panel

COM 1

AUDIO IN HI

COM 1 AUDIO LO 10

COM 1 MIC AUDIO OUT HI

COM 1 MIC KEY OUT*

COM 2 AUDIO IN HI

COM 2 AUDIO LO 14

COM 2 MIC AUDIO OUT HI

COM 2 MIC KEY OUT* 30

COM 1 Transceiver

(Connected as COM 2)

Garmin

GTN 750

1003

500 Ω COM AUDIO HI

COM MIC AUDIO LO

COM MIC KEY

500 Ω COM AUDIO LO

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

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.

GTN 750 Installation with Second COM

Figure F-1. GMA 35 – COM/NAV Interconnect

Sheet 2 of 2

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Garmin GTN 650 Manual

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