myopenmoko at richip.dhs.org
Tue Sep 4 19:38:07 CEST 2007
On Tue, 2007-09-04 at 10:27 -0700, John Seghers wrote:
> Part of the process of receiving signals involves heterodyning--basically
> mixing a received signal with lower intermediate frequencies (IFs) to
> amplify the desired actual signal, while making the carrier signal something
> easier to work 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?
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