Sangean ATS-909X w (V1) - Manual (Page 27)

The PRIORITY button allows instant program and recall to your
favorite station from any frequency across any band or receiving
any mode by simply pressing one button. To program the Priority
button for recall your favorite station, press Memo button,
the MEMO will flash in the LCD display and then press
PRIORITY button.
PRIORITY BUTTON (Instant Priority)
Background noise or static is present to some degree at
every location. This is a normal condition. If you set the squelch
above the background noise level, the radio will remain silent
until a voice transmission is detected. It is best to set the squelch
as low as possible (to just before static is constant). This way you
can hear signals that may be weak. If you set the squelch too high,
you may miss some weak voice transmissions.
To adjust the squelch level, press the Squelch button until
SQUELCH flashes on the display. Then rotate the Tuning Control
Knob slowly clockwise from OFF through 12 (increasing squelch)
until the radio just becomes silent. When the level control for the
squelch threshold is set, only signals above the Squelch threshold
will be stopped.
SQUELCH
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