David wrote:
On Thu, 20 Apr 2006 17:41:31 -0500, clifto wrote:
David wrote:
On Thu, 20 Apr 2006 16:09:32 -0500, clifto wrote:
Resonance is one of many things that goes into receiving signals,
but when you come right down to it the receiver is nothing more
than a device which processes the voltage (or current) fed it from
an antenna. You use it to select one of many signals (using
resonance), amplify the heck out of it and extract the information
from the result.

What's that got to do with a current flowing to ground?

Ohm's Law. When you put a voltage across an impedance, current flows.
The voltage induced in a typical antenna is with respect to ground.

So, radio doesn't work in outer space? If I had a six transistor
radio 50 miles up I couldn't hear Limbaugh?

You know, I've wondered about that, too. The closest to explaining
that I've conjured is that the electromagnetic field works up
there, but I can't imagine how the electrostatic field from the
transmitting antenna could work on a space antenna. But antenna
design has always been black magic to me.

--
All relevant people are pertinent.
All rude people are impertinent.
Therefore, no rude people are relevant.
-- Solomon W. Golomb