Yaesu VX-127, Руководство по эксплуатации

Страница: 15 / 88

VX-127 O
PERATING
M
ANUAL
13
O
PERATION
S
QUELCH
A
DJUSTMENT
To set the squelch, press the [ F
] key, followed by the
MONI switch just below the PTT
switch on the left side of the transceiver.
Now rotate the DIAL (outer knob) to find the lowest
setting (“
LVL 1
” through “
LVL 15
”) that will just si-
lence the background noise. Do not use a higher setting
than necessary, or sensitivity to weak incoming signals
will be degraded.
Press the PTT switch momentarily when you’ve made
the new setting; this will return you to normal operation (without having transmitted).
1) A special “RF Squelch” feature is provided on this radio. This feature
allows you to set the squelch so that only signals exceeding a certain S-meter
level will open the squelch. See page 18 for details.
2) 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-127 has, try using that mode for silent monitoring of busy
channels.
F
REQUENCY
N
AVIGATION
The VX-127 will initially be operating in the “VFO” mode, a channelized system which
allows free tuning throughout the currently-selected operating band.
Three basic frequency navigation methods are available on the
VX-127
:
1) Tuning Dial
Rotation of the
DIAL
(outer knob) allows tuning in the pre-programmed steps established
for the current operating band. Clockwise rotation of the
DIAL
causes the
VX-127
to be
tuned toward a higher frequency, while counter-clockwise
rotation will lower the operating frequency.
If you press the [
F
] key momentarily, then rotate the
DIAL
,
frequency steps of 1 MHz will be selected. This feature is
extremely useful for making rapid frequency excursions over
the wide tuning range of the
VX-127
.