User's Manual

C-5000 COMMUNICATION MANAGEMENT CONTROLLER
INSTALLATION MANUAL
Page 4-4 Publication No. 150-041118
Section 4 – Electrical Installation Rev C
May 2006
Pin(s) - Signal Name
9, 29 - PRIMARY CARBON MIC HI/LO
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.
18 - PRIMARY MIC PTT
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.
39, 40 - PRIMARY HEADSET AUDIO HI/COMMON
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.
10, 17, 20, 41 - SECONDARY CARBON MIC HI/LO, SECONDARY HEADSET AUDIO HI
AND SECONDARY MIC PTT
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.
11 – SHIELD
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.
43, 44 - A/C POWER GROUND AND 27.5 VDC A/C POWER
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.