I'm seeing a reiteration of an earlier message with no explanation.
Perhaps I have misunderstood what is meant by "...dropping it [the feedline]
down vertically in line with the main antenna element..."
I have pictured a feedline dropping away _below_ a vertical radiating
element, in line with it, and having no part parallel to the same radiator.
The excerpted description above could easily refer to a feedline parallel to
the radiating element although I have no idea why anyone would feed an
antenna in that fashion. However that would indeed result in a great deal
of coupling it seems to me. Otherwise, I wish to have this explained to me
please. Thank you very much.
Sincerely,
Rob Atkinson
K5UJ
----Original Message Follows----
From: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Reply-To: "Ian White, G3SEK" <g3sek@ifwtech.co.uk>
To: rfi@contesting.com
Subject: Re: [RFI] Computer RFI problem
To: <rfi@contesting.com>
Date: Tue, 6 Aug 2002 07:55:22 +0100
Rob Atkinson, K5UJ wrote:
>
>I must say that I find this somewhat far-fetched. I'd like for someone to
>please explain how this can be, in particular the part about a feed line
>dropping down below a vertical antenna, in line with it "maximizing the
>coupling to the main antenna element." If you want to couple your feed
>line to your antenna as much as possible I would advise wrapping it in a
>spiral around the antenna all the way to the top.
When it comes to "far-fetched" I'm obviously out of my league.
I simply meant that <of all the cable layouts anyone would use in practice>
dropping it down vertically in line with the main antenna element will give
maximum coupling. And indeed it will.
--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek
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