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Message-ID: <612542AE1A3F497CB206279B0F0F8ECA@IBM7FFA209F07C>
From: "Chris" <c.ashby435@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <AANLkTimiygEmJQ5_2-heM2mhkit_GiDp38RVNEVqCUcN@mail.gmail.com>
Date: Tue, 14 Dec 2010 12:18:03 -0000
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Subject: LF: Re: G3XBM - very long carrier VLF transmission test Dec 15th
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Hi Roger,
I was under the impression that your earlier tests had shown that rece=
ption from your earth electrodes at any distance was only possible by=
 also using earth electrodes. This suggests that those of us using an=
 aerial stand little or no chance, correct?
>From what I recall of tests done forty or so years ago with friends,=
 using wideband audio into the ground, any form of 'in air' reception=
 attempt was seriously bad. The reception of a signal injected into th=
e earth as the conduction medium also required the receive system to=
 be in the same medium i.e. the earth.
Do prove me wrong...and good luck with the tests.
Vy 73,
Chris, G4AYT, Whitstable, Kent.
  ----- Original Message -----=20
  From: Roger Lapthorn=20
  To: rsgb_lf_group@blacksheep.org ; Nick Swales ; Chris Osborn ; Gary=
 - G4WGT ; vlf0308@abelian.org ; paula.taylor@metoffice.gov.uk=20
  Sent: Sunday, December 12, 2010 10:51 PM
  Subject: LF: G3XBM - very long carrier VLF transmission test Dec 15t=
h


  This Wednesday, Dec 15th, I will run tests on 8.7608kHz with very lo=
ng continuous TX periods of several hours interspersed with gaps of 0.=
5 to 1 hour. Transmissions will start at 0900GMT and finish at 2300GMT=
. I will reveal the TX pattern after the test so the test is done "bli=
nd".

  I'd be most grateful if suitably equipped stations could look for an=
y possible signs of the signal, even though I shall only be using the=
 20m spaced earth electrodes and 5W as used for my local earthmode tes=
ts. Those able to screw the bandwidths right down may just be able to=
 detect something, although I think it is unlikely at any great distan=
ce.


  15.12.10    =20
  0900-2300z =20
  8.7608kHz   =20
  Carrier "on" periods of 30mins or more


  Good luck to anyone having a go.

  73s
  Roger G3XBM

  --=20
  g3xbm-qrp.blogspot.com/
  www.g3xbm.co.uk
  www.youtube.com/user/g3xbm
  G3XBM   GQRP 1678    ISWL G11088

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<DIV><FONT size=3D2 face=3DArial>Hi Roger,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>I was under the impression that your=
 earlier tests=20
had shown that reception from your earth electrodes at any distance wa=
s only=20
possible by also using earth electrodes. This suggests that those of=
 us using an=20
aerial stand little or no chance, correct?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>From what I recall of tests done fort=
y or so years=20
ago with friends, using wideband audio into the ground, any form of 'i=
n air'=20
reception attempt was seriously bad. The reception of a signal injecte=
d into the=20
earth as the conduction medium also required the receive system to be=
 in the=20
same medium i.e.&nbsp;the earth.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Do prove me wrong...and good luck wit=
h the=20
tests.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Vy 73,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Chris, G4AYT, Whitstable, Kent.</FONT=
></DIV>
<BLOCKQUOTE   style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT:=
 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV     style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color:=
 black"><B>From:</B>=20
  <A title=3Drogerlapthorn@gmail.com href=3D"mailto:rogerlapthorn@gmai=
l.com">Roger=20
  Lapthorn</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Drsgb_lf_group@=
blacksheep.org     href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_l=
f_group@blacksheep.org</A> ;=20
  <A title=3Dnds12321@btinternet.com href=3D"mailto:nds12321@btinterne=
t.com">Nick=20
  Swales</A> ; <A title=3Dg3xiz@yahoo.co.uk href=3D"mailto:g3xiz@yahoo=
.co.uk">Chris=20
  Osborn</A> ; <A title=3Dg4wgt@tiscali.co.uk     href=3D"mailto:g4wgt=
@tiscali.co.uk">Gary - G4WGT</A> ; <A     title=3Dvlf0308@abelian.org=
     href=3D"mailto:vlf0308@abelian.org">vlf0308@abelian.org</A> ; <A=
     title=3Dpaula.taylor@metoffice.gov.uk     href=3D"mailto:paula.ta=
ylor@metoffice.gov.uk">paula.taylor@metoffice.gov.uk</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, December 12, 20=
10 10:51=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> LF: G3XBM - very lon=
g carrier=20
  VLF transmission test Dec 15th</DIV>
  <DIV><BR></DIV>This Wednesday, Dec 15th, I will run tests on <B>8.76=
08kHz</B>=20
  with very long continuous TX periods of <U>several hours</U> intersp=
ersed with=20
  gaps of 0.5 to 1 hour. Transmissions will start at 0900GMT and finis=
h at=20
  2300GMT. I will reveal the TX pattern after the test so the test is=
 done=20
  "blind".<BR><BR>I'd be most grateful if suitably equipped stations=
 could look=20
  for any possible signs of the signal, even though I shall only be us=
ing the=20
  20m spaced earth electrodes and 5W as used for my local earthmode te=
sts. Those=20
  able to screw the bandwidths right down may just be able to detect=
 something,=20
  although I think it is unlikely at any great distance.<BR><BR>
  <DIV style=3D"MARGIN-LEFT: 40px"><B>15.12.10&nbsp;&nbsp;&nbsp;&nbsp;=
=20
  </B><BR><B>0900-2300z&nbsp; </B><BR><B>8.7608kHz&nbsp;&nbsp;&nbsp;=
=20
  </B><BR><B>Carrier "on" periods of 30mins or more</B><BR></DIV><BR>G=
ood luck=20
  to anyone having a go.<BR><BR>73s<BR>Roger G3XBM<BR clear=3Dall><BR>=
-- <BR><A     href=3D"http://g3xbm-qrp.blogspot.com/"     target=3D_bl=
ank>g3xbm-qrp.blogspot.com/</A><BR><A href=3D"http://www.g3xbm.co.uk"=
     target=3D_blank>www.g3xbm.co.uk</A><BR><A     href=3D"http://www.=
youtube.com/user/g3xbm"     target=3D_blank>www.youtube.com/user/g3xbm=
</A><BR><A href=3D"http://vlf_grabber"     target=3D_blank></A>G3XBM&n=
bsp;&nbsp; GQRP 1678&nbsp;&nbsp;&nbsp; ISWL=20
G11088<BR></BLOCKQUOTE></BODY></HTML>

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