Manual RadioShack PRO-2049 - 90 Channel (page 33 of 40) (English)

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AVOIDING IMAGE FREQUENCIES

You might discover one of your regular stations on another frequency that is not list-

ed. It might be what is known as an image frequency. For example, you might find

a service that regularly uses a frequency of 431.975 also on 474.775.

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

Note the new frequency. 474.775

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, 431.975

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

is usually cleared whenever there is a broadcast on the actual frequency.

FREQUENCY CONVERSION

The tuning location of a station can be expressed in frequency (kHz or MHz) or in

wavelength (meters). The following information can help you make the necessary

conversions.

1 MHz (million) = 1,000 kHz (thousand)

To convert MHz to kHz, multiply the number of megahertz by 1,000:

9.62 (MHz)

1000 = 9620 kHz

To convert from kHz to MHz, divide the number of kilohertz by 1,000:

2780 (kHz)

1000

= 2.780 MHz

To convert MHz to meters, divide 300 by the number of megahertz:

300

7.1 MHz = 42.25 meters

20-419.fm Page 33 Wednesday, March 24, 1999 2:43 PM

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RadioShack PRO-2049 - 90 Channel Manual

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