22
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 / , VOLUME, and SQUELCH.
Note: The keylock does not prevent the scanner from
scanning channels or monitoring a single channel, which-
ever feature you last selected.
To turn on the keylock, hold down / for about 3
seconds until the scanner beeps three times and ap-
pears. To turn it off, hold down / for about 3 sec-
onds until the scanner beeps three times and disap-
pears.
Avoiding Image Frequencies
You might hear one of your regular stations on another
frequency that is not listed. For example, you might find
a service that regularly uses a frequency of 453.275 also
on 474.675 MHz. Do the following to determine of you
are listening to an image frequency:
Note the new frequency 474.675
Double the intermediate (21.400)
frequency of 10.7 MHz
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 transmission 21.4 MHz
above or below the tuned frequency. This is rare, and the
image signal is usually cleared whenever there is a trans-
mission on the actual frequency.
Resetting/Initializing the Scanner
If the scanner’s display locks up or does not work prop-
erly after you connect a power source, you might need to
reset or initialize the scanner.
Important: If you have problems, first try to reset the scan-
ner (see “Resetting the Scanner” on Page 23). If that does
not work, you can initialize the scanner (see “Initializing
the Scanner” on Page 23); however, this clears all infor-
mation stored in your scanner’s memory.
Manual01.p65 2003/03/11, 15:46Page 22 AdobePageMaker6.5J/Win
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