Telamon wrote:

EM waves, radio or light, do not depend on a medium to propagate.


We all know there is a medium and is called ETHER.

Let's get with it..It IS the nineteenth century, after all...



mike

David wrote:

On 20 Apr 2006 16:17:57 -0700, "RHF"
wrote:

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

No. The opposite, actually.


The antenna will develop maximum signal at it's resonant frequency. This
signal energy will then be transfered most efficiently to the radio when
the impedance of the antenna is the same as that of the radio.

A power generator works the same way..the antenna is just a stationary
conductor in a moving field looking for a suitable load to drive.



mike

RHF wrote:

David - Switched or un-switched the Exposed Outer Ring
of the 1/8" Mono Jack used for the Earphone Output is
usually the Radio's Electrical Circuit Ground and is also
the RF Signal Ground.

NOTE - This idea and application is mainly for Radios
that do not have a built-in External Antenna Input that
offers a Grounding "Attachment" Point for the Radio.


My car radio is isolated from ground by four large rubber doughnuts and
still manages to outperform most of the in-house am radios, using an
obscenely small antenna on top of it all.

Your advice would imply that dragging ten or twenty feet of logging
chain from the chassis would reduce signal noise, at least on wet days.

Is that really a logical conclusion? I'm having problems with your
assumptions.



mike

m II wrote:
Telamon wrote:
EM waves, radio or light, do not depend on a medium to propagate.

We all know there is a medium and is called ETHER.

Everybody knows that. But there is no Ether Bunny.

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

David,

Until the individual 'portable' AM / FM Shortwave Radio
Owner tries - The Four Tricks to Try for Better AM
{Medium Wave} Radio Reception - They Don't Know.
http://groups.google.com/group/rec.r...227b009aa19478


Until Then - One does not know whether their 'portable'
AM / FM Shortwave Radio "Wants" a Ground or an
Antenna or both or neither.

Sometimes What Works - WORKS ! - "IF" - You Give It A Try !
{ Remember 'if' at First You Don't Succeed :
try, Try and TRY ! again, Again. and AGAIN ! }
http://www.bartleby.com/59/3/ifatfirstyou.html
http://www.quotedb.com/quotes/1841
http://www.answers.com/topic/if-at-f...-try-try-again



overly redundantly yours - iane ~ RHF

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

4. Take a 3-6 Foot piece of Insulated Wire and strip-off
an Inch of Insulation from both ends and attach one end
to a ground within the room (Cold Water Pipe?). Make
sure that the Radio's Whip Antenna is fully extended.
Next "Touch" this Wire to the Exposed Ring of the
Radio's Earphone Jack.
- - - Does the Radio's Reception Improve or get Noiser ?
Try this on the AM, FM and Shortwave Bands
HEY - Even try Touching this Ground Wire to the
Radio's Collapsed Whip Antenna )
- - - Does the Radio's Reception Improve or get Noiser ?

"IF" - When you "Touch" the Wire to the Exposed Ring
of the Earphone Jack the Radio's Reception Improves.
Then Modify an 1/8" Mono-Plug to put into the Earphone
Jack to connect a Ground to the Radio for Improved
Reception all the time {most of the time}.

Easiest "ground" is to use the ground socket on your AC outlet.

I find a banana plug fits about right....


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 01:35:57 -0700, "RHF"
wrote:

David,

Hence the AGC Circuitry in Radios, so that a Strong Signal
that is developed by a Resonant Antenna is Averaged 'down'
-and- a Weaker Signal that is developed by a the same Antenna
at a non-resonant frequency is Averaged 'up' : So that both
Signals 'appear' to sound about the same to the ears.

NOTE - The Stronger and Weaker Signals are what the Radio
receives at the Antenna Input. In reality both Signal are
relatively the same strength around the Antenna.
* One Signal is at Resonance with respect to the Antenna
and therefore the Antenna develops a greater signal
"A Stronger Signal" that is sent to the Radio's Input.
* The 'other' Signal is Not at Resonance with respect to
the Antenna and therefore the Antenna develpos a lessor
signal "A Weaker Signal" that is sent to the Radio's Input.


and that is why the proper antenna is important
to good radio reception - iane ~ RHF
.
You're going to explain circuitry to me? HAH!

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.