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From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
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Date: Sun, 7 Dec 2008 20:00:34 -0000
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Subject: Re: !!!Re: LF: Re: E field active antennas
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While Troll'ing the web ...

I came  across this post , by G2AJV ,  note the reference to a alloy or 
copper plate below the coil and earthed ..
this was the quantum leap from the  counter wound systems that are suspect a 
little like the CFA ... (anyone remember shifnell ?)  that eliminated the 
flash over at cross over .. as there is 'no' crossover  and the need to 
fabricate an array that was a  mirror image of itself ..the conducting plate 
acting as a mirror..



G ..



http://web.ukonline.co.uk/g3ldo/coil.htm


I have just read some recent correspondence on this net concerning the pros 
and cons of placing the antenna-loading coil in the shack or at the base of 
the vertical aerial wire. The loading coil is not just a matching device, it 
is also a primary source of vector potential and it is the vector potential, 
rather than its offspring, the magnetic and electric fields, which is the 
fundamental source of electromagnetic radiation. It is therefore 
advantageous to place the coil upright at the base of the antenna. 
Furthermore, as a large component of the vector potential is locally 
concentrated in this region, it may be possible to gain a few dBs by placing 
an aluminium or copper plate, somewhat larger than the diameter of the 
solenoid, a few centimetres under the solenoid, insulated from the earth but 
it may be connected directly to the TX ground terminal. (It reflects the 
vector potential instead of allowing it to be absorbed in the terrain, but 
DON'T stand on the plate to adjust the solenoid whilst running at full power 
!!!). I appreciate that some readers may not be au fait with vector 
potential and perhaps its fundamental role deserves to be lightly aired in 
the amateur radio journals.

Roger, G2AJV.




--------------------------------------------------
From: "Stewart Bryant" <stewart@g3ysx.org.uk>
Sent: Sunday, December 07, 2008 6:26 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: !!!Re: LF: Re: E field active antennas

>
> Andy Talbot wrote:
>> Simultaneous whole band Rx, flat response.  And yes, it must be
>> simultaneous 2 - 30MHz
>> By all means come down and sort it out for us if you like. But mine
>> does the job perfectly.
>> Was only speculating if the helical winding might make any difference.
>>
>
> Andy
>
> Please stop feeding the group troll.
>
> Stewart
>
>
>
>



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