Date: Sun, 23 Sep 2012 11:47:31 +0200
From: "Dennis" <Dennis.Hennig@gmx.de>
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Subject: Thanks! / was: Re: LF: loop - low angle signal reception
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Many thanks Markus for this neat explanation, and many thanks Edgar for asking that question!  :)

Especially that somehow twisted loops will not loose their nulls is a good message to me. ;)

Greetings!
Dennis, Berlin, DL6NVC





-------- Original-Nachricht --------
> Datum: Sun, 23 Sep 2012 11:01:45 +0200
> Von: "Markus Vester" <markusvester@aol.com>
> An: rsgb_lf_group@blacksheep.org
> CC: rsgb_lf_group@yahoogroups.co.uk
> Betreff: Re: LF: loop - low angle signal reception

> Hi Edgar,
> 
> good question. I think on LF, where the size of the antenna is much
> smaller than a wavelength, the shape of the loop does not affect the radiation
> pattern at all. This is even true if it were distorted in three dimensions,
> there is always an effective axis which defines the direction of the two
> opposite nulls. Also the height above ground (or below it in the case of an
> earth antenna) makes little difference.
> 
> Induced voltage is proportional to area, so the  2x2 should produce
> slightly more signal than the 1x3. On the other hand, depending on local
> environment, B may be better than A in terms of ground losses and local QRM pickup.
>  
> 
> Best wishes,
> Markus
> 
> 
> From: Edgar J Twining 
> Sent: Sunday, September 23, 2012 5:32 AM
> To: rsgb_lf_group@blacksheep.org 
> Subject: LF: loop - low angle signal reception
> 
> 
> Hi,
>     The rectangles in the image are ment to represent loop receiving
> antennas.
> 
> The numbers represent the length of the sides. ie there have the same
> perimeter.
> 
> 
> Does making the rectangle taller provide better low angle signal
> reception?
> 
> Regards Edgar
> Moonah, Tasmania.