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Ok Peter - Thanks for info. Heard this one at
~ 1mile, at its worst.
Rog.
----- Original Message -----
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
to be centred on the 14MHz band.
It is
distributed over an area of a couple of miles mainly by the
telephone lines.
I have had a description of this QRM on my website for
some time now but no
one has been able to identify it as yet. It has
even been described in the
the EMC column in RadCom and has still not
been identified.
I would
appreciate any help on this matter. All details can be found on
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
> envelope, chirping from MF to
HF.
> System had been working fine for 3yrs - then owner lost sync &
B/B
> 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
> finally
emerged that a spare/second wart had been used for these tests.
>
Rog.
>
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