MED | |
BUS |
475.750 | Channel 14 |
481.750 | Channel 15 |
487.750 | Channel 16 |
493.750 | Channel 17 |
499.750 | Channel 18 |
505.750 | Channel 19 |
511.750 | Channel 20 |
Note: Some cities use the |
|
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.
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. | |
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 broadcast
21.4MHz 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.
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 MHz by 1,000:
30.62 MHz × 1000 = 30,620 kHz
To convert from kHz to MHz, divide the number of kHz by 1,000.
127,800 kHz ÷ 1000 = 127.8 MHz
To convert MHz to meters, divide 300 by the number of MHz.
300 ÷ 50 MHz = 6 meters
Guide to the Action Bands | 27 |
