The Top Controls; Power Switch/Volume Knob; Squelch - AOR AR1000 Manual

AR1000 Reference

The Top Controls

The top panel contains controls for volume, squelch, tuning, and attenuation. In
addition, it contains jacks for earphones and the antenna. These controls are
described below.
ATT
EAR
UP
DN
MIN MAX
VOL SQL
ANT
Power Switch/Volume control
The switch in the center of the top panel is a double rotary switch. The inner
knob is the power and volume control while the outer knob is the squelch
control.
You turn on the scanner by turning the power/volume knob clockwise, past the
click. After power comes on, continued turning clockwise increases the volume.
Turning the knob in the opposite direction decreases the volume. When the
knob clicks again, you have turned off power to the unit.

Squelch

The outside knob controls the squelch. The squelch control suppresses the
background hiss that occurs on frequencies that do not contain active transmis-
sions. By setting the squelch control to the proper level, you will filter out the
hiss, but allow transmissions to "break squelch" and be received by the scanner.
The actual setting for the squelch control will depend on several factors, but on
most AR1000s the normal position is between 11 o'clock and 12 o'clock as you
look down, with the display toward you.
You may close the squelch to such an extent that even active signals don't get
through, so be sure to experiment with this control. In general, you want to close
it enough to eliminate hiss from all the frequencies you scan or search. First turn
the squelch control counter-clockwise until you hear hiss, and then turn it
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