[Elecraft] Home made Sigma-GT5 & KRC2 or SGC?

Sun Mar 21 14:13:00 2004

Earl, one point of confusion is that presumably the vertical dipole is
center fed as a balanced load. To what is the radial ground field connected
relative to the feed system?

Is the intent to establish enough copper in or on the ground to minimize
I^2R loss in the soil caused by proximity of the end of the vertical dipole
which is a point of high r-f potential? In that case, it would be connected
to nothing associated with the feed system . . .
I note that some commercial "halfwave" verticals use shortened radials at
the ground end of the antenna connected in some manner to the antenna.
Presumably this is intended to reduce "ground" loss.

73, George W5YR
Fairview, TX
[email protected]
http://www.w5yr.com

----- Original Message ----- 
From: "Earl W Cunningham" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Sunday, March 21, 2004 12:40 PM
Subject: Re: [Elecraft] Home made Sigma-GT5 & KRC2 or SGC?

> Mike, K5PU wrote:
>
> "I am becoming a big fan of vertical dipoles because they are small
> footprint, don't require radials...."
> ==========
> The myth about half-wave verticals not needing radials has been around
> for quite some time.
>
> The radiation resistance of a half-wave vertical is still only 72 ohms
> and unless the antenna is quite high above ground, it is still subject to
> the same ground losses as any vertical unless a good ground radial system
> is beneath it.
>
> 73, de Earl, K6SE
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