[modeleng] Re: Wireless OT
- From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 3 Dec 2004 21:19:01 -0000
John,
Thanks.
The entry for Daventry shows it as 30Kw, so that is obviously the one, and
predates Droitwich.
That makes the book pre-1935 which is better than a , well my, guess.
As for the TV part, of course you are right. Bairds was 30 line.Marconi was
405, although I seem to recall that it was something , lower when it was
first proposed. 200 and something, I think.
According to this book, there were several different mechanical scanning
systems, but nothing that resembles the Marconi system and Baird isnt
mentioned either. Some, the Noctovision, for example, appear to be
theoretical rather than factual. That was supposed to use infra red
scanning, which, by unexplained means, gave a clear picture without needed
any lights on the subject. As we know, whilst it would give a picture of
sorts, nothing that would please the average viewer of Coronation Street!
One fascinating piece of trivia is the section on licences. A radio licence
was 10s/- year. A home constructors Marconi licence was 12/6 per year, and
the manufacturers licence to use Marconi's patents was 5 shillings per valve
per set. No wonder radios were so expensive in the early days!
I can remember the licence plate, a small plastic label, which was still
affixed to sets in the '60's, as I am sure you can. Marconi must have made a
fortune from those patents.
Alan
----- Original Message -----
From: "John Pagett" <john.pagett@xxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, December 03, 2004 8:48 PM
Subject: [modeleng] Re: Wireless OT
Alan,
I have a copy of the press release for the opening of the Droiwtich
transmitter which states
"The new 150-kilowatt "national" broadcasting station of the British
Broadcasting Corporation was opened on September 6th and will entirely
supersede the old 30-kilowatt 5XX at Daventry....."
From the documentation this would be 1934.
I didn't think Baird's system was 405 line -I'm sure it was about 30
vertical lines. I know the BBC used Baird's and the Marconi Company's
systems alternately, and eventually went with Marconi's.
There is a feeling in Bromsgrove that the transmitter, which is at
Wychbold, should have been named "Bromsgrove" because it is slightly
nearer than Droitwich!
Any help?
JohnP
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