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From: g3zjo <g3zjo@psk31.plus.com>
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Date: Mon, 10 Apr 2017 20:05:50 +0100
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Subject: Re: VLF: DFCW-6000
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Status: RO

Hi Stefan

Loops at this QTH are not very successful, yes lots of mains borne QRM. 
I do have a 1.2m diameter octagonal 10mm copper loop, I have never tried 
that on Sub 9kHz, I may try it one day down at the shed but its not 
possible for a while.

That little bit of woodland you spotted for possible /P is private, as 
usual for the UK :-( Although there are some public foot paths that pass 
through, it is still part of Lady Di's father, Earl Spencer's estate I 
think. His gamekeepers have barricaded in some 4 wheel drive vehicles 
which were in another of his parcels of woodland here:- 
http://no.nonsense.ee/qth/map.html?qth=IO92MG54RP&from=IO92MG54MO and 
the owners had to abandon them. The size of the parcels of woodland is 
such that if you blink as you drive past them you will miss them :-)

I don't think that spot you chose would be that quiet, there is the saw 
mill a few meters to the East and an industrial estate just to the 
South. It is so different in scale to your forests and the 
accessibility, isolation and beauty they offer.

I have in the past taken the e-probe to some fairly isolated camping 
sites to see how quiet it can be.

73 Eddie G3ZJO


On 10/04/2017 15:45, DK7FC wrote:
> What i wanted to suggest: What about a loop as an alternative antenna? 
> With 2 soundcards you could run 2 spectrograms comparing both 
> antennas. You know the loop in my tree is a single turn loop with just 
> 1.2m diameter out of  copper tube which has 10mm diameter. It is a non 
> resonated loop with a ferrite transformer (Al~10nH), i.e. 1 single 
> primary turn and about 100 secondary turns connected to the preamp. It 
> could help to reduce the QRN in summer. But maybe the QRM becomes even 
> higher. On the other side you can eventually cancel out the QRM, maybe 
> worth a try.
> Or go /p, e.g.. here: 
> http://no.nonsense.ee/qth/map.html?qth=IO92MG54RP&from=IO92MG54MO :-)