C-5000 COMMUNICATION MANAGEMENT CONTROLLER
INSTALLATION MANUAL
Publication No. 150-041118 Page 4-49
Rev A Section 4 –Electrical Installation
Sep 2001
(3) AUDIO AND SIDETONE HI AND LO (Pins 13, 14, 15 and 16)
These wires are provided separately for those systems that have separate transmitter
sidetone circuits. They should be paralleled when driving a speaker directly. 10 Watt
audio rated transceivers are not accommodated. In the case of the 100 mW
transceivers, the audio and sidetone outputs (output impedance of 600 Ohms) must be
set for 7.8 Vrms into 600 Ohms.
(4) DF DISABLE (Pin 54)
This line will disable the linear IF inside the unit and provide superior squelch action and
sensitivity when connected airframe ground. It should be permanently grounded at the
mounting rack when DF equipment is not installed in the aircraft. If used with DF
equipment, this line must be open during Direction Finding operations.
(5) DF AUDIO (Pin 19)
Provides an audio output for use with DF equipment requiring AM receiver response.
With an output impedance of 500 Ohms, the DF Audio output can supply 400 mVrms
open circuit with an RF signal modulated 50% at 1000 Hz.
When the RT-7200 or RT-9600(F) is used in conjunction with the Collins DF301E
automatic Direction Finder, knowledge of the Transceiver modulation phase delay at
5.68 kHz is necessary for proper DF301E compensation. This phase information is found
on a label on the rear panel of the RT-7200, or RT-9600, RT-9600F.
For DF or ADF systems designed to be used in conjunction with FM receivers, use
UNSQUELCHED MAIN AUDIO as the audio connection from the transceiver to the DF or
ADF unit.
(6) UNSQUELCHED MAIN AUDIO (Pin 12)
Buffered output of the main FM receiver, unaffected by squelch action. Provided for use
with external audio decoders. Standard modulation produces 0.58 Vrms into 1k Ohm or
greater impedance. Do not load this output with less than 600 Ohms.
(7) UNSQUELCHED GUARD AUDIO (Pin 30)
Buffered output for the guard receiver, unaffected by squelch action. Provided for use
with external audio decoders. Standard modulation produces 0.58 Vrms into 1k Ohm or
greater impedance. Do not load this output with less than 600 Ohms.
(8) MAIN AUDIO INHIBIT (Pin 26)
When grounded, will mute audio outputs from the main receiver.
(9) EXTERNAL GUARD AUDIO INHIBIT (Pin 25)
When grounded, will mute audio outputs for the guard receiver.
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