User's Manual

20-315 Owner’s Manual
Page 28
period of time. To turn it off, press both
PGM and (light/key symbol), or press (light/key
symbol).
TURNING THE KEY TONE ON AND OFF
The scanner is preset to sound a tone each time you press one of its keys (except
(light/key symbol)). You can turn the key tone off or back on.
1. If the scanner is on, turn VOLUME counterclockwise until it clicks to turn the it off.
2. While you hold down 2 and ENT, turn on the scanner.
3. When
oFF tonE
or
on tonE
appear, release 2 and ENT.
USING THE KEY LOCK
Once you program your scanner, you can protect it from accidental program changes by
turning on the keylock feature. When the keypad is locked, the only controls that operate
are
LIGHT, VOLUME, and SQUELCH.
Note: The keylock does not prevent the scanner from scanning channels or monitoring a
single channel, whichever feature you last selected.
To turn on the keylock, hold down (Key Symbol) for about 3 seconds until the scanner
beeps three times and (Key Symbol) appears. To turn it off, hold down (Key Symbol) for
about 3 seconds until the scanner beeps three times and (Key Symbol) disappears.
AVOIDING IMAGE FREQUENCIES
You might discover one of your regular stations on another frequency that is not listed. It
might be what is known as an image frequency. For example, you might find a service that
regularly uses a frequency of 453.275 also on 474.675 MHz.
To see if it is an image, do a little math.
Note the new frequency 474.675
Double the intermediate frequency of 10.7 MHz (21.400)
and subtract it from the new frequency –21.400
If the answer is the regular frequency 453.275
then you have tuned to an image.
Occasionally, you might get interference on a weak or distant channel from a strong