Quote:
Originally Posted by dieseljeep
There's nothing in the rules, that say the IF frequency, has to be 455KC. I'm actually surprised that the IF is 262KC. I guess they used it to minimize images, the same way, they used 262KC in most car radios.
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TV sets back in the early post war days used an IF around 22MHz, then later 45MHz. But that was after channel 1 was deleted (channel 1 would have been in the middle of the 45MHz IF bandwidth).
Some prewar 45MHz band FM radios used an IF around 8MHz.
I think the FCC avoids assigning powerful transmitters on the popular IF frequencies. 455KHz, 10.7MHz, 45MHz and so on.