Yaesu VX-3R, Руководство по эксплуатации, Страница: 13 / 132

VX-3R O
PERATING
M
ANUAL
11
O
PERATION
S
QUELCH
A
DJUSTMENT
The VX-3R ’s Squelch system allows you to mute the background noise when no signal is
being received. The Squelch system make “standby” operation more pleasant, and signifi-
cantly reduces battery current consumption.
The Squelch system may be adjusted independently for the FM and Wide-FM (FM Broad-
cast) modes.
1. Press the [ F/W
] key, followed by the
MONI switch on the left
side of the radio. This provides a “Short-cut” to Set Mode Item
78:
SQ LVL SQ LVL SQ LVL SQ LVL SQ LVL
.
2. Now, rotate the DIAL knob to set the Squelch so that the back-
ground noise is just silenced (typically at a setting of about “
1 1
1 1
1
”
or “
2 2
2 2
2
” for AM/FM, and “
2 2
2 2
2
” or “
3 3
3 3
3
” for Wide-FM/FM Broadcast/
AM Broadcast). This is the point of maximum sensitivity to weak
signals.
Note : Do not forget to pull the
DIAL
knob to rotate the
DIAL
knob.
3. When you are satisfied with the Squelch threshold setting, press the PTT switch mo-
mentarily to save the new setting and exit to normal operation.
1) The VX-3R can set the squelch threshold level on the AM mode, FM mode,
Wide FM mode, and AM Broadcast individually.
2) A special “S-meter Squelch” feature is provided on the VX-3R. This fea-
ture allows you to set the squelch so that only signals exceeding a certain S-meter level
will open the squelch. See page 22 for details.
3) If you’re operating in an area of high RF pollution, you may need to consider “Tone
Squelch” operation using the built-in CTCSS Decoder. This feature will keep your ra-
dio quiet until a call is received from a station sending a carrier, which contains a matching
(subaudible) CTCSS tone. Or, if your friends have radios equipped with DCS (Digital
Coded Squelch) like your VX-3R has, try using that mode for silent monitoring of busy
channels.