Well it is understandable. The current maximum in the half-wave antenna is
lifted well above ground level. Had there been a radial system it would have
had to employ very long radials, for most of the vertical's radiation would
have been hitting the ground at points far away from the base of the vertical.
It is only at those distant points that very long radial wires would be able to
gather the radiation from the ground's surface and feed it back to the
feedpoint.
Charles, W2SH
________________________________
From: Topband <topband-bounces@contesting.com> on behalf of Mike Waters
<mikewate@gmail.com>
Sent: Sunday, February 18, 2018 6:31 PM
To: Roger Kennedy
Cc: topband@contesting.com
Subject: Re: Topband: 1/2 wave inv L
Yup! The lack of a radial system explains why the 1/2w vertical worked
better. :-)
73, Mike
https://nam03.safelinks.protection.outlook.com/?url=www.w0btu.com&data=02%7C01%7C%7C45041a0e70384ee2478008d57727b9e9%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636545934864203108&sdata=Pk6iMJXzsyQupFqxoKoeDy7Qn7WTNUF%2BOgHr40Q5n6E%3D&reserved=0
On Feb 18, 2018 4:55 PM, "Roger Kennedy" <roger@wessexproductions.co.uk>
wrote:
Many years ago, a friend of mine used to operate on 160m with vertical
antennas suspended on a big Weather Balloon filled with hydrogen . . .
After using Quarter-wave verticals for a few months, he changed over to
Half-wave verticals . . . he found they worked much better !
He didn't have much of a radial system (due to lack of space), mainly just
earth rods at the base . . . so I suspect that's one of the reasons why.
Roger G3YRO
_________________
Topband Reflector Archives -
https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.contesting.com%2F_topband&data=02%7C01%7C%7C45041a0e70384ee2478008d57727b9e9%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636545934864203108&sdata=nFxj%2BLqwi1DLEFj3hHgpcSkBljKeHcT2AZrzNna7YSw%3D&reserved=0
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|