An FM radio receiver is tuned to a 90.6 MHz broadcast station It will receive an image frequency of?

Answer 1

Normaly IF frequency is 455 kHz, so if broadcasted signal frequency is 90.6 MHz

then it's image frequency would be 91.51 Mhz.

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That's very true if the receiver's IF is 455 KHz. While typical of AM receivers,

it's seldom used for FM ones, as most FM stations would have an image

frequency in the band, which would get messy. The almost universal IF

frequency for consumer-grade single-conversion FM radios, at least in the

US, is 10.7 MHz. If the receiver in the question is one of those, then the

image frequency is 69.2 MHz for a low-side local oscillator, or 112 MHz

for a high-side LO.

A couple of observations:

-- That would be a poor choice for a broadcast license in a city that also

had a local Channel-4 TV under the old analog channelization, or an ATC

voice or VOR on 112.0 MHz.

-- We may not be dealing with a question from the USA at all, since the FM

broadcast carrier frequencies in the USA are all on the odd tenths of a MHz ...

89.9 ... 90.1 ... 90.3 ... etc., and you'd never find a US FM station at 90.6 .

(Not a legally licensed one anyway.)