On Thu, 20 Apr 2006 16:09:32 -0500, clifto wrote:

David wrote:
On Wed, 19 Apr 2006 16:17:19 GMT, (Mark Zenier)
wrote:
Remember, a receiver works on the voltage difference between the antenna
input and its local ground.

I thought it worked on resonance.

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?

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.

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

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?

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

On Thu, 20 Apr 2006 22:46:25 GMT, 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'd use a "loop".... where the second wire simulates a ground.

rj

RJ - "You'd use a 'loop'....
where the second wire simulates a ground."

please explain - i am lost in space - iwtk ~ RHF

On 25 Apr 2006 01:38:53 -0700, "RHF"
wrote:

RJ - "You'd use a 'loop'....
where the second wire simulates a ground."

please explain - i am lost in space - iwtk ~ RHF
.
.
A loop works by the priciple of a magnet moving past a coil. No
ground required.

I remember in early,early 1963 at the Belleville,Illinois Train
station.(U.S.Army,,, Scott Air Force Base,Illinois,ARADCOM,Nuclear
Missiles)That Here we go loop the loop,here we go loop the lai,song
thingy was rollin (by the way,my name aint Joe,Objective,Burma! movie on
Radio tv now)
cuhulin

David - So are you claiming that 'only' Resonant Current
Flows to ground ? ;-) ~ RHF

FWIW - There is a lot of Dipole Antennas out there
free floating above ground that must not be working )

IIRC - The Antenna Input has a characteristic impedance
50, 75, 300, or 500 Ohms. Subsequent to that the internal
circuity of the Radio can be Resonated to Select and
Amplify an RF Signal and then process it into an Audio
Sound that we can Hear.

yes it is that simple ~ RHF