In article , Jim Lesurf jcgl@st-
and.demon.co.uk writes
In article , tony sayer

wrote:
In article , Jim Lesurf jcgl@st-
and.demon.co.uk writes


What sort of interference?, not pirate I presume.

Mix of pops, clicks, buzzes, etc. Combined with bursts of modulation of the
background noise level and breakthough from 'foreign' stations.
Particularly in the summer when we seem to get stations from many miles
away as co-channel interference with R3 FM. Most of the time this is at a
low level, so you wouldn't notice it on a station like R4. But on a R3
concert it can be quite obvious.

The signal level indicated does not vary noticably, so it isn't so much due
to signal fading as to unwanted 'contributions' from elsewhere. Sometimes
you hear the speaking on the interference, but more often you just head the
background noise level modulating with periods of 3-10 seconds, typically.

Some of it might come from Leuchars AFB or Biggles as he flys overhead,
contributing to global warming. :-)

We are located up a hill with a clear view well across the North Sea. So it
seems that we get quite strong signals from over the water.

Most of the time it is OK. But the problems arise often enough that there
is a fair chance that at some point in a concert in the summer, a problem
with be audible if I listen to a R3 concert. In general, it might go
unnoticed for something like a string quartet, but it shows up on
orchestral items.



Presume you do have a directional aerial and a good grade, CT100 or
similar, of co-ax feeder?.

Course your local TX might be re-transmiting what it receives if its an
RBR one 'tho if a main station it should be on PCM, and its very
possible that the BBC don't even know if theres a problem.

Which one was it again Jim?.

Course what the sods ought do it to put the rates up on Satellite when
all those problems would be history apart from a very odd bit of rain
fade;!....

Pity the poor sods in London.. interference on FM and now ****e on DAB.

I get far more interference on FM here that I did when I lived in East
London.

Well thats changed!. I think everyone's awaiting for the first SFN DAB
pirate who no doubt will use very high bit rates;!!!


One of the things I welcomed about DAB as it has shown almost zero
interference effects here. Signal level about 12dB above the top of the
scale on the tuner.


It does suffer from co channel as some on the south coast will tell you
'jus cos its dab doesn't mean its not interfereable with!...
Slainte,

Jim


--
Tony Sayer