Pin(s) - Signal Name (Continued)
13 - MAIN RECEIVE AUDIO DISABLE
Grounding this line mutes Main Receiver audio, but does not affect sidetone or
Guard Receiver audio. The main squelch test function is disabled, yet the main
channel indicator shows channel activity.
54 - GUARD RECEIVE AUDIO DISABLE
Grounding this line disables guard audio, but does not affect Main Receiver or
sidetone audio. The guard channel indicator continues to indicate guard channel
activity.
58 - MAIN SQUELCH LITE
The Transceiver pulls this line low to activate the main squelch annunciator in
the Control Unit.
48 - GUARD SQUELCH LITE
The Transceiver Guard Module pulls this line low to activate the guard squelch
annunciator in the Control Unit.
2 - TRANSMIT POWER LITE
The transceiver pulls this line low to activate the transmit annunciator in the
Control Unit.
25 - SQUELCH DISABLE
This line is grounded by the test (squelch disable) button on the Control Unit. It
opens the squelch gate for the Main or Guard Receiver unless:
In the Transmit Mode.
Main or Guard RCVR Audio is disabled by the Control Unit.
Frequency Synthesizer not locked (Main only).
In addition, the Main and Guard Squelch indicators will activate unless disabled
by the following conditions:
Transmit Mode.
Frequency Synthesizer not locked (Main only)
56, 15, 16, 17, 59 - CHANNEL MEMORY DISCRETES 1 thru 5
These lines provide a user programmable combination of discrete electronic
switches for each channel. Each channel memory discrete state may differ
between transmit and receive on any channel. These outputs are programmed
when the channel information and tone code information are entered into the
Control Unit.
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