OK Roger, as you know, I am not so
surprised, I will att. my equivalent circuit Idea where the house is the
antenna. See what comments ensue.
73
-----Original
Message-----
From:
[email protected] [mailto:[email protected]] On Behalf Of Roger Lapthorn
Sent: 20 June 2010 12:36
To: [email protected]
Subject: LF: Re: 500kHz earth
electrode loop - further testing today with step-up transformer
Some
very interesting results so far, but still not tried a step up transformer as
the ones I've tried got hot.
Just tried this...
I've an earth rod just
outside the back of the house, so I connected one end of the 500kHz TX to this
ground rod and disconnected completely the wire to the ground rod down the far
end of the garden. The other end of the loop was connected to the copper central
heating radiator as before. The length of wire to the "outside the back
door" ground is at most 7m long over the flat roof and down to the rod.
What happened? Current in the loop is up 20%, voltage is down 20% but I'm
still being received by M0BMU and G0KTN (210km) with S/N within 2dB of the
earlier "larger loop in the ground" set up!
So, what IS going on? Effectively all I have now is a short wire going to a
ground rod outside the back door and the other end to the radiator, yet 5W from
my 500kHz transverter is STILL getting halfway across England!
I'm now more puzzled than before why this arrangement works at all, let alone
so well.
73s
Roger G3XBM
On 20 June 2010 10:23,
Roger Lapthorn <[email protected]>
wrote:
In the next few hours
I've a new experiment on 500kHz WSPR using my earth electrode "loop".
A small step-up transformer should allow me to better match the earth loop and
therefore increase the ERP some 4-6dB. To make a valid test I'll run the beacon
for periods with and without the step-up transformer to see if a clear pattern
emerges. You'll have to guess which is which.
So, (as always) I'll much appreciate any 500kHz WSPR reports today.
73s
Roger G3XBM
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