Quote:
Originally posted by cjll3
When are they going to stop bullsh**ing people about TV detector vans and admit the only detecting equipment they have is the bloke standing at the front door listening to the 6 o'clock news.
New T.V. Licencing Vans 
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Well, yes, talk of magnetic fields from the TV sounds a load of old rubbish. And even if it wasn't, foil (presumably aluminium) would be as much use as a chocolate teapot for shielding it; you'd need something like mumetal. Presumably what they're talking about is electromagnetic radiation from the set, which is much more possible. Unless things have changed since my young days, all radio sets and TV sets combine the incoming signal with the output from a local oscillator to give an intermediate frequency (IF) signal. The IF frequency is fixed, which makes things easier for the detector van.