FLEXCOMM
II
C-5000 (Non-Digital)
Installation Manual
150-1355-000 Rev. M
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page 112
Pin(s) - Signal Name
9, 35, 34, 57, 44, 3, 49, 53, 52, 55, 30, 10, 32, 31, 26, 4, 37, 5, 27, 28, 51 - CHANNEL
LINES
The channeling lines use BCD (Binary Coded Decimal) negative logic to control
the Transceiver channel frequency. These lines are grounded by the Control Unit
to channel the Transceiver to the selected frequency. The channel is determined
by adding the weighted value of each line. To channel a transceiver to 157.135
MHz, the following lines would be grounded:
100
MHz line
40
MHz line
10
MHz line
4
MHz line
2
MHz line
1
MHz line
0.1
MHz line
0.02
MHz line
0.01
MHz line
0.005
MHz line
157.135
MHz
Unselected channel lines should 8 Vdc.
12, 43, 1, 29, 6 - TONE A, B, C, D, E
These lines are used to provide pre-programmed control of a synthesized CTCSS
encoder/decoder in the transceiver. The order of the lines follows a binary code
with E the most significant bit and A the least significant. Logic "0" is a ground
line and logic "1" must be greater than 8 volts. Refer to Section 6, Preset
Channel Programming, for information on programming tones and Table 6-2,
Section 6, for available frequencies.
23 - MAIN TONE ENABLE
This line, when grounded, will activate the continuous tone controlled squelch
system (CTCSS) for either transmit tone encode or main receiver tone decode.
The tone frequency is determined by the Tone A, B, C, D, E lines.
8 - ON/OFF
This line, when grounded, will activate the 28 V system relay and p27.5
Vdc aircraft power to the Transceiver.
