In article niN7o.36344$Pi3.12119@hurricane,
Woody wrote:
"Dave Plowman (News)" wrote in message
...
In article ,
David Looser wrote:
"Don Pearce" wrote

The GPO line that fed the main London medium wave Home
Service
transmitter had a pretty dreadful rolloff, which the Beeb
engineers
used to limit the frequency response offered to the
transmitter. At
some point the line was changed to a better one and all of a
sudden
the medium wave service was going out to about 12kHz. After
a few
months this was noticed, and a lowpass filter was put in.

Can't remember the exact dates, I'm afraid, but it was while
John Peel
had his Top Gear programme on Sunday afternoons.

Sounds like an urban legend to me. Do you have any evidence
that this
extraordinary claim is true?

I was told the land line to Brookmans Park used for R2 (light
prog) on
247? metres was originally installed for pre-war TV sound which
was
'advertised' as being of better quality than radio. And had
about double
the bandwidth of a normal circuit.
All that came from a BBC lines person in the '60s. FWIW. After
I asked why
my Quad AM tuner sounded so much better on R2 than other AM
stations.
There was also something else about the 247 wavelength which
allowed the
BBC to broadcast a wider bandwidth than some of the other
frequencies
allocated to them.

--


The Light Programme was 1500m (200KHz) LW. Radio 1 started on 247m
(1217KHz) and the Home Service (R4) was on 330m (911KHz) and 433m
(695KHz). I seem to remember the Third Programme (R3) was on 495m
(603KHz) or something like that. Note these frequencies are those used
before the UK came into line with the rest of the 9KHz world and
'corrected' the frequencies to be integer multiples.

It certainly wasn't long wave I was referring to. Could well have been R1
on medium wave - which carried some R2 progs at various times.

The line would have been to Droitwich (there was no MW London repeater
in those days - that came much later) and I would guess they might have
been able to get away with a wider bandwidth due to lack of proximity
of adjacent stations.

No - definitely BP. That bit I'm sure of.

Interestingly, a few years ago (OK, maybe the 80's) Atlantic 252
transmitted from the RoI used a form of vestigial sideband which gave a
subjectively 'cleaner' sound. I think in fact it was a lower sideband
and the actual carrier frewuency was 254KHz but I could be wrong.

--
*I used up all my sick days so I called in dead

Dave Plowman London SW
To e-mail, change noise into sound.