On 9/4/07, Richi Plana <[EMAIL PROTECTED]> wrote: > Fascinating. So "passive receivers" really aren't? Or are there classes > of receivers which are (no amplification or very sensitive pickups)?
In theory nowadays DSPs are fast enough to process the lower bands of radio signals directly off-the-air with no IF, but I'm not sure if anybody's doing that yet. Suspect the modern ham HF rigs might be doing that, but haven't researched it. But a clock signal for any digital system might also cause radiated interference, right? Radar and GPS and GSM are all too high in frequency to handle that way, so far. > Prolly off-topic, but I sure am curious. Are there no radar detectors > which don't give off their presence? http://en.wikipedia.org/wiki/Radar_detector says that first radar detector detector detectors were developed so the radar detector can shut down when it detects that it's being detected; then they just started using a lot of different IF's so the police can't monitor them all. So modern radar detectors are mostly immune to detection. Yes it's off-topic... will shut up now
