Alexandra Carter wrote:
I've heard that detecting the 455-kHz LO of a superhet
isn't all that hard, and that for instance in countries that require a
radio license, they use such techniques to check if people in their
houses have radios (or TVs) that they're not on record of having
licenses for!
Here in Fresno, there's a billboard that detects the FM station to which
car radios passing it are tuned, and summarizes the data for marketing
purposes.
I always switch to AM when I see it.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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