In my reading about green radios I can't afford (but want anyway) and
in various readings 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! And, in a lot of the military radios, the
shielding is VERY good so that detection is much harder to do.
73 de Alex NS6Y.
On Jul 9, 2006, at 5:29 AM, Gil Stacy wrote:
"But the German radar detector receivers used supperregenerative
detectors,which radiate a weak signal."
Don't know whether this is apocryphal or not, but I had heard from a
former USAF EW tech that the VC in Viet Nam in the early days
figured out
how to make U.S. field superhets' LO "howl" , giving away qth,
causing some
units to switch to TRF technology.
Gil NN4CW
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