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4.11 Receiver Audio
RECEIVER AUDIO OUT is a 40 mW audio output that is intended to drive a recording device or an audio
panel.
RECEIVER AUDIO OUT supplies 40 mW (4.9 Vrms) into a 600 load, and is generally connected to the
audio panel (if used). This output can also drive a recording device. When driving a recording device the
output level will typically need to be reduced. The output level is controlled through configuration mode.
RECEIVER AUDIO OUT is the summation of the receiver audio, COM sidetone audio, intercom audio,
and AUX audio.
RECEIVER AUDIO OUT HI
RECEIVER AUDIO LO
4.12 Pilot/Copilot PTT Inputs
When pulled low, these inputs allow the audio that is present on the PILOT/COPILOT MIC IN to be
transmitted over the radio.
Active-Low discrete inputs are considered active if either the voltage to ground is ≤3.5 VDC or the
resistance to ground is ≤375 .
These inputs are considered inactive if the voltage to ground is 6.5-33 VDC or the resistance to ground is
>100 k.
PILOT PTT*
COPILOT PTT
*
*Indicates Active Low
4.13 TX Interlock
TX Interlock Out is an active low output that indicates that this radio's (GTR 200/200B) COM is
transmitting. Connect to another COM's TX Interlock input. TX INTERLOCK OUT will sink 20mA of
current and will output a voltage of 1V or less.
TX Interlock In is an active low input that desenses (protects) the COM receiver when another COM is
transmitting.
TX Interlock In is considered active if either the voltage to ground is ≤3.5 VDC or the resistance to ground
is ≤375 .
TX Interlock In is considered inactive if the voltage to ground is 6.5-33 VDC or the resistance to ground is
>100 k.
TX INTERLOCK OUT
TX INTERLOCK IN*
*Indicates Active Low
190-01553-00
Rev. P
Pin Name
Pin Name
Pin Name
Pin
10
29
Pin
35
15
Pin
GTR 200/200B Installation Manual
I/O
Out
--
I/O
In
In
I/O
4
Out
5
In
Page 4-6
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