C-5000 COMMUNICATION MANAGEMENT CONTROLLER
INSTALLATION MANUAL
Publication No. 150-041118 Page 4-39
Rev A Section 4 –Electrical Installation
Sep 2001
• Antenna switching
• External encoder enable (disable).
• External decoder enable (disable).
• Any functional or equipment switching associated with a given channel.
These switch closures may be combined with a digital decoder to expand the capabilities.
These switches are open collector drivers. Open switch voltages may not exceed +30 V,
and in the closed condition, the switches will sink up to 40 mA.
(14) CONTROL UNIT GROUND (Pin 62)
This line provides signal ground reference for the Control Unit. (The Control Unit
electronics are isolated from the chassis).
(15) AUDIO HI AND LO (Pin 41, 61)
These lines provide a balanced 600 Ohm audio output from the Transceiver and are set
for 100 mW into a 600 Ohm load. (7.75 Vrms)
(16) MIC HI AND LO/PTT (Pin 11, 33)
These lines are used for voice modulation and to enable the transmitter. Mic sensitivity is
factory set for an input of 0.25VRMS at 1 kHz to provide ±3 kHz FM deviation, 85% AM
modulation. The MIC LO/PTT line activates the transmitter when grounded and disables
the receiver outputs.
(17) TX (Transceiver Or Control, Pin 39)
The Transceiver and control pull their respective TX lines low during transmit to provide
TX information to auxiliary equipment.
(18) EXTERNAL ENCODE IN (Pin 45)
This line provides for modulating the transmitter from external encoding devices in the
frequency range of 60 to 3000Hz. Inputs of 1.0 Vrms will yield approximately ±2.5 to
±3 kHz deviation. The RT-138F and RT-406F Frequency Range is approximately 1Hz to
6 kHz.
(19) UNSQUELCHED MAIN AUDIO (Pin 21)
This line provides unsquelched audio from the Main Receiver. The frequency response
is flat from 60 Hz to 5 kHz. A received signal of 1 kHz tone at ±3 kHz deviation will
produce approximately 0.6 Vrms into a 20k Ohm load. The RT-138F and RT-406F
Frequency Range is approximately 1 Hz to 6 kHz.
(20) UNSQUELCHED GUARD AUDIO (Pin 60)
This line provides an unsquelched audio output of the Guard Receiver for use with
external audio decoders. The frequency response is approximately flat from 60 Hz to
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