What makes a radio select and hold a specific frequency?

December 13th, 2011

Question by Karen R: What makes a radio select and hold a specific frequency?
My cars antena broke (the kind that goes up when you turn the radio on). Replaced it but when I turn the radio on and the antena comes up I get service but I’m unable to select and hold a station. I get every station in range and all at once. Just curious why that is.

Best answer:

Answer by uhlawpup
It is possible that there is a tuning capacitor at the back of your radio that needs to be adjusted to match the antenna to the radio input circuitry. If this match is not done, you may be picking up signals that are spurious. Check either your car’s manual or the instruction book that came with your radio to find out if there is a tuning control like this on your set.

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