From: G0MRF@aol.com
Message-ID: <17.18fd2905.28902d1c@aol.com>
Date: Wed, 25 Jul 2001 10:09:32 EDT
Subject: Re: LF: Update from Chepstow
To: rsgb_lf_group@blacksheep.org
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In a message dated 7/25/01 10:03:22 AM GMT Daylight Time, 
steve@alg.demon.co.uk writes:

<< Recent letters from G8RW describe continuing QRM problems on 136
 kHz from an NTL cable television interface installed in a
 neighbour's house.  Bob has gone to great lengths to reduce this
 continuous source of S9 QRM.  He has set up a new antenna feed
 arrangement, and designed a remote tuning system to get the
 antenna feedpoint away from the house.  But the received noise is
 still very strong, such that even G4CNN is only just audible
 above the noise.  The response from NTL has been poor: they have
 not even sent an engineer to investigate the problem.  Naturally,
 this level of QRM means that Bob is virtually QRT on LF.
  >>

Hi Steve 

Bob is not alone there.
I'm responsible for 'Thames Radio' a local broadcast station here in West 
London.
I had a call from the Radio Authority (the regulators) about unusually high 
signal levels outside the agreed service area. Apparently they could hear it 
in their Covent Garden offices off the back of a beam antenna.
When I investigated, NTL had errected an antenna in front of, and slightly 
below our beam. and this was degrading the front to back ratio.
Despite calls to NTL no action was forthcoming. After a while the site owner 
also gave up and decided to take a hacksaw to 3 vertical sections of the NTL 
antenna.
Problem solved.

Shame Bob can't also take some direct action.
I wonder if it's the SMPSU powering the box and not the data itself.

73

David  G0MRF