C-5000 COMMUNICATION MANAGEMENT CONTROLLER
INSTALLATION MANUAL
Page 4-4 Publication No. 150-041118
Section 4 – Electrical Installation Rev A
Sep 2001
(3) Primary Carbon Mic HI/LO (Pins 9, 29)
These pins provide a 150 Ohm input impedance for the crew microphone input. Standard
Carbon Mic bias of 15V through 300 Ohms is provided. Standard modulation of 1 kHz
tone at 0.25 Vrms is factory set for ± 3 kHz deviation although an adjust range of 30 mV
to 1.5 Vrms is provided by A2R174 on the system interface board.
(4) Primary Mic PTT (Pin 18)
This pin, when grounded, activates the transceiver system(s) selected for the primary
mic/headset interface.
Note: The primary mic LO and PTT should be connected together at the mic interface
(audio panel or mic jack). Alternately, the mic LO should be grounded at the mic
interface as mic bias is not provided unless mic LO is DC grounded.
(5) Primary Headset Audio HI/COMMON (Pins 39, 40)
The pins provide receive and sidetone audio output for the transceiver system(s) selected
for the primary mic/headset interface. Standard audio levels of 100 mW into 600 Ohm
load is provided for standard modulation although an adjustment range of 0.5 to 200 mW
is provided by A2R86 of the system interface board.
(6) Secondary Carbon Mic HI/LO, Secondary PTT, and Secondary Headset Audio (Pins
10, 17, 20, 41)
These pins provide a similar interface as the primary counterparts with some functional
exceptions. Although levels and impedances provided are the same, the secondary
interface provides the limited function of talk and listen in clear, non-encrypted audio.
Features provided by the primary interface i.e. Selectable audio routing through internal
or external encryption systems integrated with the C-5000 are not supported at the
secondary interface.
(7) Shield (Pin 11)
All shields of signals originating at the C-5000 and terminating at other equipment should
be connected to this pin and left unterminated at the other equipment. Similarly, the
shields of signals originating at other equipment and terminating at the C-5000 should be
grounded at the other equipment and left unterminated at the C-5000.
(8) 27.5 Vdc A/C Power and Ground (Pin 43, 44)
These pins provide aircraft 27.5 Vdc power to the C-5000 system. Typical loading is
approximately 350 mA, however with external loading by auxiliary equipment connected
to ±15 V and +5 V pins provided, the current requirement can be 1.3 Amp at 27.5 Vdc
and approach 2 Amps at low voltage. Appropriate circuit breaker should be provided with
consideration given to separately powered radio equipment as part of the basic
communications equipment being controlled by the C-5000.
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