WiNRADiO G315 VHF/UHF Receiver
44
The
Level
squelch can operate simultaneously with any of other types of
squelch. If the
Level
squelch is selected together with any other then
both
selected conditions must be satisfied at the same time for the squelch to open
("
and
" condition).
The
Noise
,
Voice
,
CTCSS
and
DCS
squelch modes are mutually exclusive –
only one can be active at a time.
If the AGC is off, the
Level
squelch is disabled (because this also disables the
S-meter), but all other squelch types still remain active and can be used with
the manual
IF gain
setting.
To adjust the
Level
squelch control, first tune to an unoccupied frequency that
produces only noise. Increase the squelch until the receiver is muted. You will
see the red-colored segment of the S-meter growing until it gets higher than
the current S-meter value. At that moment the receiver will be muted and the
word “
squelched
” will be displayed on the S-meter. Add a few dB extra (to
allow a margin for background noise fluctuation on the band). Now when you
tune to an occupied frequency, if its signal strength is higher than the squelch
level, the receiver will be unmuted.
To adjust the
Noise
squelch control, first tune to an unoccupied frequency that
produces only noise. Note the
Noise
value indicated inside the demodulator
spectrum display. Then tune to an occupied frequency where there is a useful
signal, and note the
Noise
value again. Then set the
Noise
threshold
somewhere between these extreme values. Note that the
Noise
squelch is
particularly effective in the FM mode. The
Noise
values depend on the
IF
Bandwidth
setting, which is useful to mention especially if you are using the
Professional Demodulator
, where the
IF Bandwidth
can be adjusted.
The adjustment of the Voice squelch is similar: Tune to an unoccupied channel
first, then an active voice channel, note the corresponding Voice spectrum
values, and set the Voice threshold between the two extremes.
It is easy to forget that squelch is active. If the receiver doesn’t seem to be
operational (no sound from the speaker), check the squelch and mute settings
first.
To disable the squelch action, simply disengage all squelch buttons (Level,
Noise, Voice, CTCSS and DCS).
