Sangean ATS-909X w (R1) - Manual (Page 27)

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PRIORITY BUTTON (Instant Priority)
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.
SQUELCH
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.