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To turn on the keylock, hold down for about 3 seconds un-
til the scanner beeps three times and appears. To turn it
off, hold down for about 3 seconds until the scanner beeps
three times and disappears.
AVOIDING IMAGE FREQUENCIES
You might discover one of your regular stations on another fre-
quency 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 transmission 21.4 MHz above or below
the tuned frequency. This is rare, and the image signal is usually
cleared whenever there is a transmission on the actual frequen-
cy.
20-314.fm Page 40 Monday, December 13, 1999 12:55 PM