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From: "Dave G3WCB" <ganymede444@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Wed, 16 Jun 2010 20:43:28 +0100
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Subject: LF: RE: Who needs antennas! - success with ground electrodes on 500kHz
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That's pretty amazing. You must have really bad soil conductivity. Did you
try receiving on the earth-loop antenna?

Would the technique work on 137 kHz, I wonder.

73, Dave G3WCB IO91RM, nr Windsor, S.E. England
  -----Original Message-----
  From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Roger Lapthorn
  Sent: 16 June 2010 20:11
  To: rsgb_lf_group@blacksheep.org
  Subject: LF: Who needs antennas! - success with ground electrodes on
500kHz


  Well, I'm amazed.

  This evening I connected my 500kHz transverter straight to the two
connections of my sub-9kHz grounded electrodes and TXed WSPR. No attempt was
made to match anything on the assumption that the two electrodes system
looked not too far from 50 ohms resistive as measured between 1-9kHz.. Pout
from the IRF510 is around 5W. What happened?

  Three people copied me - M0BMU, G7NKS and M0JXM with reports between -21
and -28dB S/N. The wire to the furtherest ground rod is at most 20m long and
most of the way it is 1.5m above ground. Once again, this must be acting as
a pretty effective loop mostly within the ground.  Screen grab of the WSPR
log attached.

  So, if you live on clunchy chalk soils like me then don't worry too much
about big antennas, :-)

  73s
  Roger G3XBM

  --
  http://g3xbm-qrp.blogspot.com/
  http://www.g3xbm.co.uk
  http://www.youtube.com/user/g3xbm
  G3XBM    GQRP 1678      ISWL G11088

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<META http-equiv=3DContent-Type content=3D"text/html; charset=3Diso-88=
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<BODY>
<DIV><SPAN class=3D218144019-16062010><FONT face=3DArial color=3D#0000=
ff size=3D2>That's=20
pretty amazing. You must have really bad soil conductivity. Did you tr=
y=20
receiving on the earth-loop antenna?</FONT></SPAN></DIV>
<DIV><SPAN class=3D218144019-16062010><FONT face=3DArial color=3D#0000=
ff   size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D218144019-16062010><FONT face=3DArial color=3D#0000=
ff size=3D2>Would=20
the technique work on 137 kHz, I wonder.</FONT></SPAN></DIV>
<DIV><SPAN class=3D218144019-16062010><FONT face=3DArial color=3D#0000=
ff   size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D218144019-16062010><FONT face=3DArial color=3D#0000=
ff size=3D2>73,=20
Dave G3WCB IO91RM, nr Windsor, S.E. England</FONT></SPAN></DIV>
<BLOCKQUOTE>
  <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT face=
=3DTahoma     size=3D2>-----Original Message-----<BR><B>From:</B>=20
  owner-rsgb_lf_group@blacksheep.org=20
  [mailto:owner-rsgb_lf_group@blacksheep.org]<B>On Behalf Of </B>Roger=
=20
  Lapthorn<BR><B>Sent:</B> 16 June 2010 20:11<BR><B>To:</B>=20
  rsgb_lf_group@blacksheep.org<BR><B>Subject:</B> LF: Who needs antenn=
as! -=20
  success with ground electrodes on 500kHz<BR><BR></FONT></DIV>Well,=
 I'm amazed.=20
  <BR><BR>This evening I connected my 500kHz transverter straight to=
 the two=20
  connections of my sub-9kHz grounded electrodes and TXed WSPR. No att=
empt was=20
  made to match anything on the assumption that the two electrodes sys=
tem looked=20
  not too far from 50 ohms resistive as measured between 1-9kHz.. Pout=
 from the=20
  IRF510 is around 5W. What happened? <B><BR><BR>Three people copied=
 me</B> -=20
  M0BMU, G7NKS and M0JXM with reports between -21 and -28dB S/N. The=
 wire to the=20
  furtherest ground rod is at most 20m long and most of the way it is=
 1.5m above=20
  ground. Once again, this must be acting as a pretty effective loop=
 mostly=20
  within the ground.&nbsp; Screen grab of the WSPR log attached.<BR><B=
R>So, if=20
  you live on clunchy chalk soils like me then don't worry too much ab=
out big=20
  antennas, :-)<BR><BR>73s<BR>Roger G3XBM<BR clear=3Dall><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.c=
o.uk</A><BR><A     href=3D"http://www.youtube.com/user/g3xbm">http://w=
ww.youtube.com/user/g3xbm</A><BR>G3XBM=20
  &nbsp; &nbsp;GQRP 1678 &nbsp; &nbsp; &nbsp;ISWL=20
G11088<BR></BLOCKQUOTE></BODY></HTML>

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