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From: "Gw3UEP" <500kcs@uku.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <001101c7b632$d5a7ea40$5cd9e150@o> <467E3B0D.40309@ukonline.co.uk>
Date: Mon, 25 Jun 2007 07:45:38 +0100
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Subject: Re: LF: 500;  RFI source captured...
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Ok Peter - Thanks for info.  Heard this one at ~ 1mile, at its worst.
Rog.
----- Original Message -----=20
From: Peter Dodd=20
To: rsgb_lf_group@blacksheep.org=20
Sent: Sunday, June 24, 2007 10:36 AM
Subject: Re: LF: 500; RFI source captured...


Interesting!
I have been plagued by a similar QRM for over three years, which seems=20
to be centred on the 14MHz band.
It is distributed over an area of a couple of miles mainly by the=20
telephone lines. I have had a description of this QRM on my website for=20
some time now but no one has been able to identify it as yet. It has=20
even been described in the the EMC column in RadCom and has still not=20
been identified.
I would appreciate any help on this matter. All details can be found on=20
my website (including wav files) - click on QRM REPORT on the index page =

to be found at
http://web.ukonline.co.uk/g3ldo

or from Google enter g3ldo,  click G3LDO Index.

In the meantime I will check all wall warts

Regards

Peter G3LDO


Gw3UEP wrote:
> Failed Wart: Post Mortem...
> Its dc-o/p is modulated with 100pps pulses. These contain an RF-burst=20
> envelope, chirping from MF to HF.
> System had been working fine for 3yrs - then owner lost sync & B/B=20
> connection; village became qrm hot-spot via BT-lines.
> The routers appeared to be powered-up as normal - hours had been spent =

> arguing with BT who were oblivious to the problem.
> Confusingly, the routers had been tested elsewhere & were ok.  It=20
> finally emerged that a spare/second wart had been used for these =
tests.
> Rog.
> =20


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<DIV><FONT face=3DArial size=3D2>Ok Peter - Thanks for info.&nbsp; Heard =
this one at=20
~ 1mile, at its worst.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Rog.</FONT></DIV>
<DIV style=3D"FONT: 10pt arial">----- Original Message -----=20
<DIV style=3D"BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A=20
title=3Dg3ldo@ukonline.co.uk href=3D"mailto:g3ldo@ukonline.co.uk">Peter =
Dodd</A>=20
</DIV>
<DIV><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><B>Sent:</B> Sunday, June 24, 2007 10:36 AM</DIV>
<DIV><B>Subject:</B> Re: LF: 500; RFI source captured...</DIV></DIV>
<DIV><BR></DIV>Interesting!<BR>I have been plagued by a similar QRM for =
over=20
three years, which seems <BR>to be centred on the 14MHz band.<BR>It is=20
distributed over an area of a couple of miles mainly by the =
<BR>telephone lines.=20
I have had a description of this QRM on my website for <BR>some time now =
but no=20
one has been able to identify it as yet. It has <BR>even been described =
in the=20
the EMC column in RadCom and has still not <BR>been identified.<BR>I =
would=20
appreciate any help on this matter. All details can be found on <BR>my =
website=20
(including wav files) - click on QRM REPORT on the index page <BR>to be =
found=20
at<BR><A=20
href=3D"http://web.ukonline.co.uk/g3ldo">http://web.ukonline.co.uk/g3ldo<=
/A><BR><BR>or=20
from Google enter g3ldo,&nbsp; click G3LDO Index.<BR><BR>In the meantime =
I will=20
check all wall warts<BR><BR>Regards<BR><BR>Peter G3LDO<BR><BR><BR>Gw3UEP =

wrote:<BR>&gt; Failed Wart: Post Mortem...<BR>&gt; Its dc-o/p is =
modulated with=20
100pps pulses. These contain an RF-burst <BR>&gt; envelope, chirping =
from MF to=20
HF.<BR>&gt; System had been working fine for 3yrs - then owner lost sync =
&amp;=20
B/B <BR>&gt; connection; village became qrm hot-spot via =
BT-lines.<BR>&gt; The=20
routers appeared to be powered-up as normal - hours had been spent =
<BR>&gt;=20
arguing with BT who were oblivious to the problem.<BR>&gt; Confusingly, =
the=20
routers had been tested elsewhere &amp; were ok.&nbsp; It <BR>&gt; =
finally=20
emerged that a spare/second wart had been used for these tests.<BR>&gt;=20
Rog.<BR>&gt;&nbsp; <BR><BR></BODY></HTML>

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