DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type;
        b=DEuVyOmBRbPA0Ovkjg60hoP0VMUcjaTCO3cK11y4aQHPgJsrxc0M9F0/6i140CT/hp
         +kE4Q+sXKkjz0ANh8KBS01lVo+YRWbyDlIZqW5ZnOZ2/R5h4tZ5/8JtbQntqAUd8wmuD
         NlCqN/0hky00XxMXc7n4Wyj/fbe6r26nSUcdE=
MIME-Version: 1.0
In-Reply-To: <AANLkTin7Yb3LqW-8KeRJX_rCSDznjTRAzVApIzs6sj9D@mail.gmail.com>
References: <AANLkTin7Yb3LqW-8KeRJX_rCSDznjTRAzVApIzs6sj9D@mail.gmail.com>
Date: Sun, 20 Jun 2010 12:35:32 +0100
Message-ID: <AANLkTilgDazWhndVLscgP35vMPQXRwzT3DCYSdJPXXER@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: LF: Re: 500kHz earth electrode loop - further testing today with step-up 
	transformer
Content-Type: multipart/alternative; boundary=0016e6d77eed060a880489749645
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


--0016e6d77eed060a880489749645
Content-Type: text/plain; charset=ISO-8859-1

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 <rogerlapthorn@gmail.com> 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
>
> --
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> http://www.youtube.com/user/g3xbm
> G3XBM    GQRP 1678      ISWL G11088
>



-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM    GQRP 1678      ISWL G11088

--0016e6d77eed060a880489749645
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Some very interesting results so far, but still not tried a step up transf=
ormer as the ones I&#39;ve tried got hot.<br><br>Just tried this...<br><br=
><div style=3D"margin-left: 40px;">I&#39;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 &quot;outsi=
de the back door&quot; ground is at most 7m long over the flat roof and do=
wn to the rod. What happened? Current in the loop is up 20%,=A0 voltage is=
 down 20% but I&#39;m still being received by M0BMU and G0KTN (210km) with=
 S/N within 2dB of the earlier &quot;larger loop in the ground&quot; set=
 up!<br>
</div><br>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 radi=
ator, yet 5W from my 500kHz transverter is STILL getting halfway across En=
gland! <br>
<br>I&#39;m now more puzzled than before why this arrangement works at all=
, let alone so well.<br><br>73s<br>Roger G3XBM<br><br><br><br><div class=
=3D"gmail_quote">On 20 June 2010 10:23, Roger Lapthorn <span dir=3D"ltr">&=
lt;<a href=3D"mailto:rogerlapthorn@gmail.com">rogerlapthorn@gmail.com</a>&=
gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; bord=
er-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">In the next few=
 hours I&#39;ve a new experiment on 500kHz WSPR using my earth electrode=
 &quot;loop&quot;. <br>
<br>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=
9;ll run the beacon for periods with and=20
without the step-up transformer to see if a clear pattern emerges. You&#39=
;ll have to guess which is which.<br><br>So, (as always) I&#39;ll much app=
reciate any 500kHz WSPR reports today. <br clear=3D"all"><br>73s<br>Roger=
 G3XBM<br>
<font color=3D"#888888">

<br>-- <br><a href=3D"http://g3xbm-qrp.blogspot.com/" target=3D"_blank">ht=
tp://g3xbm-qrp.blogspot.com/</a><br><a href=3D"http://www.g3xbm.co.uk" tar=
get=3D"_blank">http://www.g3xbm.co.uk</a><br><a href=3D"http://www.youtube=
.com/user/g3xbm" target=3D"_blank">http://www.youtube.com/user/g3xbm</a><b=
r>


G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088<br>
</font></blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D"http=
://g3xbm-qrp.blogspot.com/">http://g3xbm-qrp.blogspot.com/</a><br><a href=
=3D"http://www.g3xbm.co.uk">http://www.g3xbm.co.uk</a><br><a href=3D"http:=
//www.youtube.com/user/g3xbm">http://www.youtube.com/user/g3xbm</a><br>
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088<br>

--0016e6d77eed060a880489749645--