| |
G0TEZ > HDTV 16.10.11 10:52l 85 Lines 3483 Bytes #999 (0) @ WW
BID : 650056G0TEZ
Read: GUEST
Subj: Re: A Question ... of sorts
Path: IZ3LSV<ED1ZAC<GB7CIP
Sent: 111016/0052Z @:GB7CIP.#32.GBR.EU #:15118 [Caterham] $:650056G0TEZ
From: G0TEZ@GB7CIP.#32.GBR.EU
To : HDTV@WW
Hi Pete.
I have done so much about early TV and John Logie baird that I wasn't
going to go into that at the risk of boring people sick.
Quite simply, JLB demonstrated a crude, mono TV in the 1920s, all
mechanical. A few yers later Philo T Farnsworth, a schoolboy from Utah
built and patented the first all electronic TV system with his Image
Dissector council.
JLB turned his attention to electronic TV and a hybrid system first paying
for Philo's master patent, then worked with Farnsworth to produce all
electronic TV. By 1939, JLB had progressed to high definition colour TV in
3D with his Telechrome TV camera and demonstrated large screen CTV by
closed cct in a cinema in London.
Not much is said about how he transmitted his TV but it seems to have been
a frame sequential system which would have been compatible with the mono
systems being tried by the BBC.
In 1946, he recommended that the BBC use 625 line -ve modulation CTV with
FM sound (newly invented by Armstrong in the US) but the BBC ignored him.
They chose instead to adopt the Marconi - EMI 405 line mono system with AM
sound on small 9" and 12" screens. Baird died in June 1946 so could not
carry on trying to influence British TV.
In the interim, between 1930 and 1946, RCA under Sarnoff, spent $US 8m
trying to get Farnsworth to give up his master patent and, after the death
of Baird, Farnsworth took up their offer for an undisclosed sum, bough a
ranch and retired to breed horses and, generally enjoy himself. For many
years, a rumour was circulated that Farnsworth drank himself to death.
As it took him from 1946 to 1971, I find this hard to believe, 25 years !?
The equipment Baird used was collected by un named men from the UK
government after his death, leaving hislaboratory bare.
In the 1990s, engineers at Sky, reproduced his Telechrome system and
displayed amazing pictures in 3D colour to press and engineers.
The general consensus was "It is the finest system of TV we never had."
The big mystery among all engineers is why did we not have a large
screen,colour system in 1946, after the war instead of the miserable,
little mono we put up with. It wasn't until the late 50s that we started
to produce 'dual standard' sets which would switch from 405 line AM sound
to the 625 line, FM sound recommended by Baird. I worked on many of these
sets, they went faulty alot because of the problems with the huge 'system
switch' which made bad connections.
My knowledge of the above comes not from the 'net but from a conversation
I had with a man who worked with Baird and books based on the almost 300
patents Baird filed relating to TV. I even had a later conversation with a
man who worked for the BBC, by phone, he was a TV expert and lectured on
TV.
He asked me if he could record our conversation and I agreed.
We have had many programmes, mostly denigrating JLB and Farnsworth but
some
give the account I have, especially the ones based on research by one of
Bairds two sons, Prof Malcolm Baird at a university in Toronto.
It will remain one of the biggest mysteries in envention.
The official start dates for TV were in 1936 by the british using the EMI
system and the Germans, using a version of the Baird system. Then all
closed down for WW II.
Sorry that was long. I kept it as short as I could but you ddid ask.
CUL.
73 - Ian, G0TEZ @ GB7CIP
Message timed: 01:52 on 2011-Oct-16 BST
Message sent using WinPack-Telnet V6.80
Read previous mail | Read next mail
| |
