Manual RadioShack PRO-76 - 200 Channel (page 33 of 48) (English)

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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 431.875 also on 474.675.

To see if it is an image, do a little math.

Note the new frequency 474.675

Double the intermediate frequency of 21.4 MHz (42.800)

and subtract it from the new frequency –42.800

If the answer is the regular frequency 431.875

then you have tuned to an image.

Occasionally, you might get interference on a weak or distant

channel from a strong broadcast 42.8 MHz above or below the

tuned frequency. This is rare, and the image signal is usually

cleared whenever there is a broadcast on the actual frequency.

RESETTING THE SCANNER

If the scanner’s display locks up or does not work properly after

you connect a power source, you might need to reset the scan-

ner.

Caution:

This procedure clears all the information you have

stored into the scanner. Before you reset the scanner, try turn-

ing it off and on to see if it begins working properly. Reset the

scanner only when you are sure it is not working properly.

To reset the scanner, turn it off then turn it back on while holding

the

and

keys.

CLEAr

appears.

20-313.fm Page 33 Friday, January 7, 2000 3:09 PM

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RadioShack PRO-76 - 200 Channel Manual

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