[Lowfer] MP Loop antenna reconfigured

[Laurence KL1 X]

I recall the original 1 cable #8 required around 9nF to resonate but adding 4 X #6 and #8 required 12nF or so. It was a lot of copper and loops diverged by a few feet depndant on which branch of the Cottonwoods the slingshot put a weight over - ! an increased the signal around 1.5dB was realized - again this from memory.

Ground screens beneath loop to reduce ground losses....experiment :-)

Ive just installed 2 x 3 ft widths  x 150ft long , separated by 5 ft or so of welded fence wire parallel to the loop on the ground and bonded to each other  and then tied down to a Well bore casing - it was getting dark so I couldnt play long but it resulted in a reduction of some 200pf to resonate the main loop - loop current remained the same as expected.

 We will see what differences it makes when the wx improved - it just started snowing...  All "grounds" are isolated back to the coax so it is a reactance change at least.

Cheers
Laurence



> From: mitch.powell at sympatico.ca
> Date: Sat, 8 Dec 2012 11:59:54 -0500
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] MP Loop antenna reconfigured
> 
> Jay:
> I could possibly re-arrange the wires by moving them down and doing the parallel
> connection. I remember that Laurence kept adding parallel sections to his  loops
> resulting in greater current. 
> 
> I notice that the loop current did not increase very much ----maybe from 15A to 15.3A
> which I was puzzled about  - expecting more. We might have a few more days above 
> freezing and I could throw a few more wires along the line.
> Thanks for the input.
> 
> Mitch
> On 2012-12-08, at 8:25 AM, <jrusgrove at comcast.net> wrote:
> 
> > Mitch
> > 
> > Additional wire might be better off used to 'fatten up' the loop conductor, lowering R and increasing loop current.
> > 
> > Jay W1VD  WD2XNS  WE2XGR/2
> > 
> 
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