04-11-2016, 03:21 PM
(This post was last modified: 04-11-2016, 03:23 PM by ppppenguin.)
The Metrovick TX technology, notably the demountable output valves, went on to be the basis of the Chain Home radar TX. According to Paul Marshall they were cheaper and more rugged than the Marconi valves that were custom designed for M-EMI vision TX. Excellent valves but a bit fragile and expensive by comparison.
As for where all the Baird kit went in 1937, I've never heard a word about it. Back to the iron foundry from whence it came? The film camera from the IF system reputedly turned up some years ago and is now at Bradford. There is some discussion as to whether it is the genuine article. The route it took was back to Vinten(?) and refurbished for normal 16mm use. Then spotted many years later as having an unsual plate over the hole where the 17.5mm film came out of the bottom into the processing tanks.
One point that hasn't been mentioned here is that the Baird vision system was essentially AC coupled. Unlike the M-EMI system which had black at a fixed carrier level. This wasted a lot of TX power so the range of the Baird system was potentially rather less. Baird's engineers may not have had the skills to do proper black level, may have thought it not worthwhile or there may have been patent issues.
As for where all the Baird kit went in 1937, I've never heard a word about it. Back to the iron foundry from whence it came? The film camera from the IF system reputedly turned up some years ago and is now at Bradford. There is some discussion as to whether it is the genuine article. The route it took was back to Vinten(?) and refurbished for normal 16mm use. Then spotted many years later as having an unsual plate over the hole where the 17.5mm film came out of the bottom into the processing tanks.
One point that hasn't been mentioned here is that the Baird vision system was essentially AC coupled. Unlike the M-EMI system which had black at a fixed carrier level. This wasted a lot of TX power so the range of the Baird system was potentially rather less. Baird's engineers may not have had the skills to do proper black level, may have thought it not worthwhile or there may have been patent issues.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
