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Old September 17th 03, 01:01 AM
John Miles
 
Posts: n/a
Default Interesting antenna?

http://www.aftenposten.no/english/lo...ticleID=609108

I've always assumed that the performance of ferrite-rod antennas in
transmitting applications was limited by core saturation. Wonder if
there's anything to this "invention"?

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------
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Old September 17th 03, 06:10 AM
Active8
 
Posts: n/a
Default

In article ,
says...
http://www.aftenposten.no/english/lo...ticleID=609108

I've always assumed that the performance of ferrite-rod antennas in
transmitting applications was limited by core saturation. Wonder if
there's anything to this "invention"?

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

not much info there, but i've read articles about russian experiments on
small antennae and something about a capacitive antenna.

somewhere in the jumble, i came across a theory/claim supposedly
originated by Nikolai Tesla. the theory being that applying a large
voltage - low freq. ac, dc... i don't remember - to a short antenna
would set up an electrically large antenna by virtue of the electric
field.

say you applied 1000V to a 1m whip. that's 1000V/m. or it's 1V/m over a
length of 1000m effective antenna length. that's the theory... key word
"theory".

brs,
mike
  #3   Report Post  
Old September 17th 03, 06:10 AM
Active8
 
Posts: n/a
Default

In article ,
says...
http://www.aftenposten.no/english/lo...ticleID=609108

I've always assumed that the performance of ferrite-rod antennas in
transmitting applications was limited by core saturation. Wonder if
there's anything to this "invention"?

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

not much info there, but i've read articles about russian experiments on
small antennae and something about a capacitive antenna.

somewhere in the jumble, i came across a theory/claim supposedly
originated by Nikolai Tesla. the theory being that applying a large
voltage - low freq. ac, dc... i don't remember - to a short antenna
would set up an electrically large antenna by virtue of the electric
field.

say you applied 1000V to a 1m whip. that's 1000V/m. or it's 1V/m over a
length of 1000m effective antenna length. that's the theory... key word
"theory".

brs,
mike
  #4   Report Post  
Old September 17th 03, 07:36 AM
Kevin McMurtrie
 
Posts: n/a
Default

In article t,
Active8 wrote:

In article ,
says...
http://www.aftenposten.no/english/lo...ticleID=609108

I've always assumed that the performance of ferrite-rod antennas in
transmitting applications was limited by core saturation. Wonder if
there's anything to this "invention"?

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

not much info there, but i've read articles about russian experiments on
small antennae and something about a capacitive antenna.

somewhere in the jumble, i came across a theory/claim supposedly
originated by Nikolai Tesla. the theory being that applying a large
voltage - low freq. ac, dc... i don't remember - to a short antenna
would set up an electrically large antenna by virtue of the electric
field.

say you applied 1000V to a 1m whip. that's 1000V/m. or it's 1V/m over a
length of 1000m effective antenna length. that's the theory... key word
"theory".

brs,
mike


Saturating the air becomes a problem. Coronas will sap away the power
and slowly incinerate the antenna with ozone.
  #5   Report Post  
Old September 17th 03, 07:36 AM
Kevin McMurtrie
 
Posts: n/a
Default

In article t,
Active8 wrote:

In article ,
says...
http://www.aftenposten.no/english/lo...ticleID=609108

I've always assumed that the performance of ferrite-rod antennas in
transmitting applications was limited by core saturation. Wonder if
there's anything to this "invention"?

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

not much info there, but i've read articles about russian experiments on
small antennae and something about a capacitive antenna.

somewhere in the jumble, i came across a theory/claim supposedly
originated by Nikolai Tesla. the theory being that applying a large
voltage - low freq. ac, dc... i don't remember - to a short antenna
would set up an electrically large antenna by virtue of the electric
field.

say you applied 1000V to a 1m whip. that's 1000V/m. or it's 1V/m over a
length of 1000m effective antenna length. that's the theory... key word
"theory".

brs,
mike


Saturating the air becomes a problem. Coronas will sap away the power
and slowly incinerate the antenna with ozone.


  #6   Report Post  
Old September 17th 03, 11:18 AM
Sverre Holm
 
Posts: n/a
Default


http://www.aftenposten.no/english/lo...ticleID=609108

not much info there,


Here's some more info: http://www.ancom.no/presentation01.htm

I saw it on Norwegian TV a week or two ago, and it sounded impressive to me.

Sverre
www.qsl.net/la3za


  #7   Report Post  
Old September 17th 03, 11:18 AM
Sverre Holm
 
Posts: n/a
Default


http://www.aftenposten.no/english/lo...ticleID=609108

not much info there,


Here's some more info: http://www.ancom.no/presentation01.htm

I saw it on Norwegian TV a week or two ago, and it sounded impressive to me.

Sverre
www.qsl.net/la3za


  #8   Report Post  
Old September 17th 03, 02:07 PM
Al
 
Posts: n/a
Default

In article t,
Active8 wrote:

In article ,
says...
http://www.aftenposten.no/english/lo...ticleID=609108

I've always assumed that the performance of ferrite-rod antennas in
transmitting applications was limited by core saturation. Wonder if
there's anything to this "invention"?

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

not much info there, but i've read articles about russian experiments on
small antennae and something about a capacitive antenna.

somewhere in the jumble, i came across a theory/claim supposedly
originated by Nikolai Tesla. the theory being that applying a large
voltage - low freq. ac, dc... i don't remember - to a short antenna
would set up an electrically large antenna by virtue of the electric
field.

say you applied 1000V to a 1m whip. that's 1000V/m. or it's 1V/m over a
length of 1000m effective antenna length. that's the theory... key word
"theory".


You're misusing the word "theory." You mean hypothesis. I know, I know,
I'm nitpicking. But I once was chewed out by a physicist at MIT for
misusing the word when I was temping there. Ouch.

Al

PS:

theory - a proven fact which explains an aspect of nature; i.e., the
Theory of Relativity.

hypotheses - A tentative explanation that accounts for a set of facts
and must be proven by further experimentation.

--
There's never enough time to do it right the first time.......
  #9   Report Post  
Old September 17th 03, 02:07 PM
Al
 
Posts: n/a
Default

In article t,
Active8 wrote:

In article ,
says...
http://www.aftenposten.no/english/lo...ticleID=609108

I've always assumed that the performance of ferrite-rod antennas in
transmitting applications was limited by core saturation. Wonder if
there's anything to this "invention"?

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

not much info there, but i've read articles about russian experiments on
small antennae and something about a capacitive antenna.

somewhere in the jumble, i came across a theory/claim supposedly
originated by Nikolai Tesla. the theory being that applying a large
voltage - low freq. ac, dc... i don't remember - to a short antenna
would set up an electrically large antenna by virtue of the electric
field.

say you applied 1000V to a 1m whip. that's 1000V/m. or it's 1V/m over a
length of 1000m effective antenna length. that's the theory... key word
"theory".


You're misusing the word "theory." You mean hypothesis. I know, I know,
I'm nitpicking. But I once was chewed out by a physicist at MIT for
misusing the word when I was temping there. Ouch.

Al

PS:

theory - a proven fact which explains an aspect of nature; i.e., the
Theory of Relativity.

hypotheses - A tentative explanation that accounts for a set of facts
and must be proven by further experimentation.

--
There's never enough time to do it right the first time.......
  #10   Report Post  
Old September 17th 03, 02:25 PM
Active8
 
Posts: n/a
Default

In article ,
says...

http://www.aftenposten.no/english/lo...ticleID=609108

not much info there,


Here's some more info: http://www.ancom.no/presentation01.htm

I saw it on Norwegian TV a week or two ago, and it sounded impressive to me.

Sverre
www.qsl.net/la3za




geeze. a one sentence per page presentation that tells me nothing. i
wonder how it works.

i can finally build an HF shoe phone and those trees won't wreck the
intergalactic commo array on the fuel truck that services my flying
saucer.

brs,
mike
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