FLEXCOMM
II
C-5000 (Non-Digital)
Installation Manual
150-1355-000 Rev. M
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page 68
Pin(s) - Signal Name (Continued)
56 - PTT TO CIPHER
This pin provides a ground to repeat the mic input (primary only).
15 - PTT FROM EXT CIPHER
When grounded, this pin will cause the C-5000 to remain in transmit mode.
Transmitter end of text messages can be transmitted after mic PTT has been
released by utilizing this input as a stretched or delayed PTT input.
26 - ZEROIZE
Not to be used on new designs.
49, 48 - MIC OUT HI/LO
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
) although
A2R170 on the system interface board provides considerable adjustment range.
22 - GUARD PRECEDENCE IN
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.
23 - BW CONTROL IN
Not to be used on new designs.
