NCS -C250C Instruction Manual page 19

11.3 PA Mode
11.3.1 Mode Description
11.3.2 Selecting PA Mode
11.3.3 Using PA Mode
11.4 RPT Mode
11.4.1 RPT Mode Description
11.4.2 Selecting RPT Mode
11.4.3 Using RPT Mode
NCS-C250C Instruction Manual Rev J
11.2.5.2 UNSEL MUTE
To mute the Unselected radios, momentarily press the UNSEL MUTE button
or the "#" button on a DTMF microphone (if enabled). The associated yellow
indicator will light and the Unselected audio will be silenced.
11.2.5.3 AUTOMUTE and the EXT MUTE Connector
This function automatically mutes the UNSEL audio and external equipment
connected to the EXT MUTE jack when PTT is keyed. Also, to mute external
equipment connected to the EXT MUTE jack on the rear panel when a
received signal lights a green Busy indicator, press and hold the AUTO
MUTE button or the digit "0" on a DTMF microphone (if enabled) until the
AUTO MUTE indicator blinks once. A short blink means the function has
been enabled. A long blink means the function has been disabled.
In this mode, received audio from selected radios will be output through the
PA Speaker Output. Keying the PTT will send Mic audio to the PA Speaker.
In PA mode, the PA (green) indicator is lit. If it's not lit, momentarily press
the PA/RPT button or the digit "9" on a DTMF microphone (if enabled) to
select PA Mode.
Select any radio(s) to be sent to the PA Speaker by momentarily pressing
any of the RAD1-RAD4 button(s) or the corresponding digits (1-4) on a
DTMF microphone (if enabled). To make a PA announcement, key the PTT
and speak into the microphone.
The SEL/PA Volume Control controls the PA volume.
In this mode, received audio from one radio is retransmitted through another
radio. Retransmitting is controlled by activation of the Busy indicators which
operate by detecting received audio (VOX). If received audio is too low in
volume, these indicators won't light and the RPT function won't work.
Press and hold the PA/RPT button or the digit "9" on a DTMF microphone (if
enabled) until the RPT (red) indicator turns on.
Any number of radios can be selected at the same time in RPT Mode. To
select a radio, momentarily press the button or the corresponding digit (1-4)
on a DTMF microphone (if enabled) for the desired radio(s).
Unless the COR Option is installed, RPT operation is VOX-based. When
RPT Mode is on, an audio level that is sufficient to light a radio's Busy
indicator will key the PTT for the other Selected radio(s) and retransmit
received audio.
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