sxpert at sxpert.org
Tue Sep 4 20:10:04 CEST 2007
Giles Jones wrote:
> On 4 Sep 2007, at 18:38, Richi Plana wrote:
>>> with. See http://en.wikipedia.org/wiki/Heterodyne for a very
>>> basic description.
>> Fascinating. So "passive receivers" really aren't? Or are there classes
>> of receivers which are (no amplification or very sensitive pickups)?
>> Prolly off-topic, but I sure am curious. Are there no radar detectors
>> which don't give off their presence?
> In the UK you have to have a TV licence if you receive TV. They use
> detector vans and can tell if you're watching. So there is enough signal
> emitted when receiving I guess.
in most if not all receivers, the downconverting sections are enclosed
in faraday cages.
the "tv detector vans" stuff is bogus as it would only work on the
crudest and oldest sets
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