Gene
ral
Ra
dio Oper
ati
on
English
46
Monitoring a Channel
Procedure:
Press the preprogrammed
Monitor
button and proceed to
Step 3.
OR
Follow the procedure below.
1
Select the desired zone and channel.
2
Listen for a transmission.
3
Adjust the
Volume Change MFK
if necessary.
4
Press and hold the
PTT
button to transmit. The LED lights
up solid red.
5
Release the
PTT
button to receive (listen).
The Carrier Squelch indicator appears on the display when you
monitor a channel via the preprogrammed
Monitor
button.
Conventional Mode Operation
Your radio may be preprogrammed to receive Private-Line
®
(PL) calls.
Procedure:
1
Momentarily press the
Monitor
button to listen for activity.
The Carrier Squelch indicator appears on the display.
2
Press and hold the
Monitor
button to set continuous
monitor operation. The duration of the button press is
programmable.
3
Press the
Monitor
button again, or the
PTT
button, to return
to the original squelch setting.
If you try to transmit on a receive-only channel, you hear an
invalid tone until you release the
PTT
button.
APX_4000_M3.book Page 46 Friday, May 31, 2013 12:41 PM