Whistler WS1095 Owner's Manual page 17

ROTARY ENCODER
Use the squelch function to optimize reception. When
the squelch level is high, only stronger signals will pass
through the squelch gate, and weaker signals may not
be received. When the squelch level is low, the squelch
gate will be open even when no signal is present, causing
WS1095 to scan slowly or to stop on Objects even when
no transmission is present, playing noise only. The WS1095
works best when the squelch gate is set so that it is closed
when no transmissions are present, but able to open when
a desired transmission occurs. The ideal setting for the
squelch level is between 9 and 11.
If you find that the WS1095 seems to be scanning very
slowly or stopping on frequencies with noise only, increase
the squelch level until normal scanning resumes.
In menus, the rotary encoder scrolls up and down through
the menu items and a single press selects the indicated
menu option. When entering alphanumeric data such as
Scan List names the rotary encoder scrolls up and down
the character list (letters, numbers, punctuation); a single
press selects the indicated character.
The rotary encoder can be used to adjust the backlight
level. Press POWER briefly with backlight illuminated, then
rotate the encoder to increase or decrease brightness.
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