User Guide
14
3
BASIC OPERATION
3
■ Audio mute function
This function temporarily mutes the audio without disturbing
the volume setting.
➥ Push [FUNC] then [
SQL
YY
D(MUTE)] to mute
audio signals.
• “MUTE” appears.
• Push [
CLR
A(MW)] (or any other key) to cancel the
function.
■ Squelch attenuator
The transceiver has an RF attenuator related to the squelch
level setting. Approx. 10 dB attenuation is obtained at maxi-
mum setting.
➥ Rotate [SQL] clockwise past the 12 o’clock position to ac-
tivate the squelch attenuator.
• Attenuation level can be adjusted up to 10 dB (approx.) between
12 o’clock and fully clockwise position.
• When setting the squelch from the microphone, a level greater
than ‘19’ activates the squelch attenuator.
NOTE: The squelch attenuator functions even when the
monitor function is in use. Thus set the [SQL] within 10 to
12 o’clock position (12 to 19 level when setting with the
HM-133V) is recommended when using the monitor func-
tion.
Squelch is
open.
Squelch
attenuator
Squelch
threshold
Shallow Deep
Noise squelch
LOCK
S
E
T
ANM
MONI
DUP
LOW
T
-
SCAN
TONE
PRIO
M/CALL
SCAN
V/MHz
DIGITAL
PRIO
AO
BUSY
MUTE
NAR
MID
LOW
Appears
MUTE