C-5000 COMMUNICATION MANAGEMENT CONTROLLER
INSTALLATION MANUAL
Publication No. 150-041118 Page 4-7
Rev A Section 4 –Electrical Installation
Sep 2001
(23) Mic Out HI/LO (Pins 48, 49)
This pair provides a buffered primary mic output. As standard configuration, the balanced
mic output is a combination of Primary Mic Input, REXMT Audio In, XMT Audio In and
Internal Cipher Voice XMT Audio. The level is set for 0.25 Vrms for standard modulation.
When external (or internal) encryption equipment is connected to the system interface
board, A2JP2 on the system interface board is typically moved from "l to 2" to "2 to 3"
and zero Ohm resistor A2R140 (system interface board) is removed. With A2JP2
changed and A2R140 removed, the mic out is only the buffered primary mic input. In
addition, the primary mic input is isolated from the rest of the C-5000 such that normal
clear text voice modulation must be routed from mic out Hi/Lo. In this configuration, the
external encryption equipment must be installed to complete the audio path from the
primary mic input to the selected transmitter(s). Jumpers from mic out Hi/Lo to XMT
Audio In Hi/Lo may be used temporarily when the external encryption equipment is
disconnected. Audio levels are typically 0.9 Vrms (600 Ω) although A2R170 on the
system interface board provides considerable adjustment range.
(24) Guard Precedence In or System Precedence Channel Select (Pin 22)
This pin, when grounded, disables nearly all of the C-5000 functions and channels the
system to a pre-stored precedence channel. The volume control is functional. This mode
is useful for an emergency mode in which all functions are disabled except basic
talk/listen on the pre-stored system precedence channel. Normal operation is with this pin
open circuited.
(25) Bandwidth Control In (Pin 23)
This pin, when grounded, activates the wideband mode on new WED radio equipment.
Normal mode is open circuit.
(26) RT-X Select A & B (Pins 16,33)
These pins, when grounded, provide and 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.
BA
NORMAL OPEN OPEN
RT-X = SYSTEM 1 OPEN GND
RT-X = SYSTEM 2 GND OPEN
RT-X = SYSTEM 3 GND GND
(27) RT-X Guard Audio Out (Pin 13)
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.
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