[RFI] Computer RFI problem

[Rob Atkinson, K5UJ]

Very good; so then we are thinking of the same configuration.  Once again, I 
would like an explanation as to why this causes a maximum amount of coupling 
of unwanted noise between the antenna and feedline. I have yet to see a 
reason given for why this is so.
Thank you very much.  Best regards,

Rob Atkinson
K5UJ
k5uj@hotmail.com


----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
Date: Tue, 6 Aug 2002 22:29:35 +0100

Rob Atkinson, K5UJ wrote:
>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,

Yes, that's correct. The main antenna element goes vertically upward from 
the feedpoint. The coax goes vertically downward from the feedpoint. A 
straight vertical line, extending upward from the ground, would pass first 
through the coax and then through the antenna element.

All this seems to me to be the normal usage of the term "in line with"...

>and having no part parallel to the same radiator.

Sorry, I don't understand that.

>The excerpted description above could easily refer to a feedline parallel 
>to the radiating element

If you mean that the feedline runs upward alongside of the radiating 
element, that is "parallel to" but *not* "in line with".


>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.

I hope that helps.

--
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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