C-5000 COMMUNICATION MANAGEMENT CONTROLLER
INSTALLATION MANUAL
Page 4-38 Publication No. 150-041118
Section 4 – Electrical Installation Rev A
Sep 2001
This line, when grounded, will activate the 28 V system relay and provide +27.5 Vdc
aircraft power to the Transceiver.
(7) MAIN RX AUDIO DISABLE (Pin 13)
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.
(8) GUARD RX AUDIO DISABLE (Pin 54)
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.
(9) MAIN SQUELCH LITE (Pin 58)
The Transceiver pulls this line low to activate the main squelch annunciator in the Control
Unit.
(10) GUARD SQUELCH LITE (Pin 48)
The Transceiver Guard Module pulls this line low to activate the guard squelch
annunciator in the Control Unit.
(11) TX POWER LITE (Pin 2)
The transceiver pulls this line low to activate the transmit annunciator in the Control Unit.
(12) SQUELCH DISABLE (Pin 25)
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)
(13) RESERVED SPARE (Pins 15, 16, 56)
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.
Some possible uses for these include:
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