C-5000 COMMUNICATION MANAGEMENT CONTROLLER
INSTALLATION MANUAL
Page 4-8 Publication No. 150-041118
Section 4 – Electrical Installation Rev A
Sep 2001
(28) REXMT Audio In (Pin 7)
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.
(29) RT-X REXMT Audio Out (Pin 1)
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.
Typical application with external encryption equipment connected to the system interface
utilizes this signal as clear text receive audio to be routed to, and returned from, the
external equipment in time of nonencrypted reception to the RT-X Decoded Audio Input.
The signal level is 2 Vrms for standard voice, although A2R108 on the system board
provides an adjustment range of 0.2 to 7.75 Vrms.
(30) RT-X REXMT Control Key Out (Pin 34)
This signal provides a ground output when the selected radio system (1, 2 or 3) main
receiver is active (squelch activity). This signal provides a PTT input to other aircraft
equipment in a multi-system relay mode.
(31) RT-X WB MN RCV Audio Out (Pin 37)
This signal is a wideband received audio signal from the selected RT system (1, 2 or 3)
main receiver. It is not squelch gated and typically is used with external encryption
equipment connected to the system interface. The standard level is 6 Vpp although
A2R135 provides an adjustment range of 1.2 to 12 Vpp. The Motorola encryption
equipment requires 4 Vpp.
(32) EXT RT-X Decoded RCV Audio (Pin 42)
This input is typically used with external encryption equipment connected to the system
interface. The signal is the decoded or de-encrypted voice band clear text from the
encryption system. By proper C-5000 system programming, this signal can be routed
directly as the selected RT system (1, 2 or 3) recovered audio or it can be internally
summed with the selected RT system guard audio, sidetone, or both. In addition, the
recovered audio can also be programmed to provide de-emphasis if required. A level of 2
Vrms is standard, although A2R131 provides an adjustment range of 0.25 to 7.75 Vrms.
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