FLEXCOMM
II
C-5000 (Non-Digital)
Installation Manual
150-1355-000 Rev. M
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page 69
Pin(s) - Signal Name (Continued)
16, 33 - RT-X SELECT A & B
These pins, when grounded, provide an external selection (in binary format) of
the selected radio system 1, 2 or 3 to be routed to the internal or external
system interface for encryption or other functions connected to the system
interface. Normal mode with C-5000 selection of the RT-X (1, 2 or 3) system is
provided when these lines are open circuit.
B
A
NORMAL
OPEN OPEN
RT-X = SYSTEM 1
OPEN GND
RT-X = SYSTEM 2
GND
OPEN
RT-X = SYSTEM 3
GND
GND
13 - RT-X GUARD AUDIO OUT
This pin provides the selected RT System Guard RCV Audio (voice band) signal
for use with external equipment. Typically the plain text guard audio is summed
with decoded main RCV audio and routed to the C-5000 for combined main
(recovered cipher) and guard (clear) to the headset. Standard levels are 2 Vrms
at low impedance, although A2R114 on the system interface board provides
adjustment range of 0.5 to 4 Vrms.
7 - REXMT AUDIO IN
This input provides an auxiliary voice band transmit audio input and is summed
with the primary mic audio. The receive audio from other equipment can be
routed to this port and in conjunction with the "PTT from Ext. Cipher" (an
auxiliary PTT input), a multi-system relay can be established. A level of 2 Vrms
for standard modulation is standard, although A2R167 on the system interface
board provides an adjustment range of 0.1 to 7.75 Vrms.
1 - RT-X REXMT AUDIO OUT
This pin provides a voice band receive audio output from the selected RT system
(1, 2 or 3). The audio is normal audio from the selected radio system and
includes both main and guard audio as well as sidetone during XMT. In
conjunction with REXMT control key out, (squelch activity from this system and
PTT input to other aircraft equipment) this signal may be used in a multi system
relay to provide receive audio from this system to transmit audio to other
equipment on board the aircraft.
