190-01182-02
GTR 225/GNC 255 TSO Installation Manual
Rev. F
Page 5-8
5.2.4.3
COM Audio
5.2.4.4
COM Audio Function
Activation of COM MIC 1 TRANSMIT enables MIC 1 AUDIO IN HI and causes the transceiver to
transmit.
Activation of COM MIC 2 TRANSMIT enables MIC 2 AUDIO IN HI and causes the transceiver to
transmit.
500
Ω
COM AUDIO is a 100 mW audio output that is intended to drive a headset or an audio panel.
5.2.4.5
COM Audio Electrical Characteristics
5.2.4.5.1
COM MIC AUDIO
MIC 1 and MIC 2 are standard carbon or dynamic mic inputs with integrated preamps providing minimum
70 mVrms into a 1000
Ω
load.
MIC 1 and MIC 2 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.
5.2.4.5.2
COM AUDIO
COM AUDIO supplies 100 mW into a 500
Ω
load. This is a balanced output and the LO output must be
connected.
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
P2001
5
In
COM MIC 2 AUDIO IN HI
P2001
6
In
MIC AUDIO IN LO
P2001
20
In
Pin Name
Connector
Pin
I/O
500
Ω
COM AUDIO HI
P2001
7
Out
500
Ω
COM AUDIO LO
P2001
18
Out
Содержание GNC 255A
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