GTN 625/635/650 TSO Installation Manual
Page 5-19
190-01004-02
Rev. C
5.2.12
COM Audio (GTN 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)
Pin Name
Connector
Pin
I/O
COM MIC 1 AUDIO IN HI
P1003
5
In
MIC AUDIO IN LO
P1003
20
In
COM MIC 1 AUDIO IN HI and COM MIC 2 AUDIO IN HI are standard carbon or dynamic mic inputs
with integrated preamps providing minimum 70mVrms into a 1000Ω load.
COM MIC 1 AUDIO IN HI and MIC 2 AUDIO IN HI are 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 6.6.10.
5.2.12.2.2 COM Audio
Pin Name
Connector
Pin
I/O
500 COM AUDIO HI
P1003
7
Out
500 COM AUDIO LO
P1003
18
Out
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.
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