In a message dated 7/25/01 10:03:22 AM GMT Daylight Time,
[email protected] 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
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