Message-ID: <144CC10B16EC4E83BF5157AAE80406F3@gnat>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <BLU177-W24C999B7A5D740C285FCA1CF6E0@phx.gbl>
Date: Mon, 15 Dec 2014 00:11:33 -0000
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Subject: LF: Re: Noisy Earth mat...?
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Hi Laurence.....a bit odd ?? I presume your ground is frozen hard now so =
winter ground loss. Just a silly thought I wonder because a lot of your =
noise is from 30 to 50km if the mat is reflecting noise into your loop =
that would in another position be absorbed in the ground ?? Then again I =
am used to fence wire being steel or maybe coated iron .....magnetic =
conversion rather than rectification, (never quite understood how =
Marconi's wire detector worked) ?? ;-)) or is your neighbour using it as =
one electrode of his Christmas lights ?

Best Wishes for the holiday
Alan
G3NYK

  ----- Original Message -----=20
  From: Laurence KL7 L=20
  To: rsgb_lf_group@blacksheep.org=20
  Sent: Sunday, December 14, 2014 11:53 PM
  Subject: LF: Noisy Earth mat...?


  It so happens my 10ft diameter multi turn LF loop is now plonked in =
the centre of an extensive earth mat consisting of bonded welded fence =
wire, and about 100 x 100ft radials, numerous Earth rods etc part of the =
MF tx system - Cant detect any diode type effects from the mat....
  =20
  Ive noticed since the loop has been surrounded by this "mat" the =
induced noise into the loop has increased and the loop effectiveness at =
137kHz  has been severely compromised  (about 5dB on Transpolar paths =
over an optimized positional L400B)  - the mat and the loop are above =
2.5 metres apart  and not electrically connected (galvanically isolated) =
with common mode chokes on the 400 coax -  there is no local coupling =
from the MF Marconi ie I can short it to ground or bring it down and the =
background noise (somewhat White in nature around -95dBm) doesn't =
change....
  =20
  So I just wondered if I should move my loop to a new Green field =
location away from the radial mat etc - anyone else noticed similar?? =
Any suggestions?
  =20
  Thanks
  Laurence KL7L et al
  ps over the pole is poor this evening so far with a little =
spreading...

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<DIV><FONT size=3D2 face=3DArial>Hi Laurence.....a bit odd ?? I presume =
your ground=20
is frozen hard now so winter ground loss. Just a silly thought I wonder =
because=20
a lot of your noise is from 30 to 50km if the mat is reflecting noise =
into your=20
loop that would in another position be absorbed in the ground ?? Then =
again I am=20
used to fence wire being steel or maybe coated iron .....magnetic =
conversion=20
rather than rectification, (never quite understood how Marconi's wire =
detector=20
worked)&nbsp;?? ;-)) or is your neighbour using it as one electrode of =
his=20
Christmas lights ?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Best Wishes for the =
holiday</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Alan</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>G3NYK</FONT></DIV>
<DIV>&nbsp;</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=3Dhellozerohellozero@hotmail.com=20
  href=3D"mailto:hellozerohellozero@hotmail.com">Laurence KL7 L</A> =
</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Drsgb_lf_group@blacksheep.org=20
  =
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, December 14, 2014 =
11:53=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> LF: Noisy Earth =
mat...?</DIV>
  <DIV><BR></DIV>
  <DIV dir=3Dltr>It so happens&nbsp;my 10ft diameter multi turn LF loop =
is now=20
  plonked in the centre of&nbsp;an extensive earth mat consisting of =
bonded=20
  welded fence wire, and about&nbsp;100 x 100ft&nbsp;radials, numerous =
Earth=20
  rods etc part of the MF tx system - Cant detect any diode type effects =
from=20
  the mat....<BR>&nbsp;<BR>Ive noticed since the loop has been =
surrounded by=20
  this "mat" the&nbsp;induced noise into the loop&nbsp;has increased and =
the=20
  loop effectiveness at 137kHz &nbsp;has been severely compromised&nbsp; =
(about=20
  5dB on Transpolar paths over an optimized positional L400B)&nbsp; - =
the mat=20
  and the loop are above 2.5 metres apart&nbsp; and not electrically =
connected=20
  (galvanically isolated) with common mode chokes on the 400 =
coax&nbsp;-&nbsp;=20
  there is no local coupling from the MF Marconi ie I can short it to =
ground or=20
  bring it down and the background noise (somewhat White in nature =
around=20
  -95dBm) doesn't change....<BR>&nbsp;<BR>So I just wondered if I should =
move my=20
  loop to a new Green field location away from the radial mat etc - =
anyone else=20
  noticed similar?? Any suggestions?<BR>&nbsp;<BR>Thanks<BR>Laurence =
KL7L et=20
  al<BR>ps over the pole is poor this evening so far with a little=20
  spreading...<BR></DIV></BLOCKQUOTE></BODY></HTML>

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