[Elecraft] Counterpoise vs ground wire ?

[Ron D'Eau Claire]

When I studied engineering (back when Marconi was a lad), a "dipole" was
defined as a 1/2 wavelength radiator. I realize that definition has softened
over the years, especially in the minds of Hams. Even engineering articles
often refer to a non-1/2 wavelength radiator as a "dipole" nowadays. That's
why I offered the comment to clarify that you were talking about a 1/2 wave
radiator.

73 Ron AC7AC 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Sunday, July 01, 2012 3:26 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Counterpoise vs ground wire ?

Actually Ron, the pure form of "dipole" is an antenna with two ends, but
typical usage refers to the half wavelength.
Yes, I did mean a 1/2 wavelength dipole - sorry for not being specific.

73,
Don W3FPR

On 7/1/2012 5:40 PM, Ron D'Eau Claire wrote:
> Note that Don said " RF Ground will be that point of zero RF voltage - 
> in a balanced dipole, it will be present right at the middle of the 
> center insulator."
>
> "Dipole" is the important word, meaning a radiator 1/2 wavelength 
> long. A full wave center fed antenna (two half waves in phase) will 
> have a voltage loop - high impedance point - at the center of the center
insulator.
>
> As the center fed antenna is made shorter than a 1/2 wave, the 
> impedance at the center also rises. Think of it as "stuffing part of 
> the antenna down the feed line" to make up a 1/2 wave.
>
> 73, Ron AC7AC
>
>
>
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