GTN 625/635/650 TSO Installation Manual
190-01004-02
Page 5-24
Rev. F
5.2.12 COM Audio (GTN 635/650 Only)
5.2.12.1 COM Audio Function
Activation of MIC 1 TRANSMIT enables MIC 1 AUDIO IN HI and causes the transceiver to transmit.
500
COM AUDIO is a 100 mW audio output that is intended to drive a headset or an audio panel.
5.2.12.2 COM Audio Electrical Characteristics
5.2.12.2.1 COM Mic Audio (GTN 635 and GTN 650 Only)
COM MIC 1 AUDIO IN HI is standard carbon or dynamic mic input with integrated preamps providing
minimum 70mVrms into a 1000
Ω
load.
COM MIC 1 AUDIO IN HI is set in the factory so that 100 mVrms modulates the transmitter to 85%
nominally at 1000 Hz. The microphone gain adjustment is made through Configuration Mode. See
Section 6.6.11.
5.2.12.2.2 COM Audio
500
COM AUDIO supplies 100 mW into a 500
load. This is a balanced output and the LO output must
be connected.
500
COM AUDIO is the summation of the COM receiver audio, COM sidetone audio, and intercom
audio.
Pin Name
Connector
Pin
I/O
COM MIC 1 AUDIO IN HI
P1003
5
In
MIC AUDIO IN LO
P1003
20
In
Pin Name
Connector
Pin
I/O
500
COM AUDIO HI
P1003
7
Out
500
COM AUDIO LO
P1003
18
Out
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