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Old 3rd Aug 2017, 12:11 pm   #1
peter_scott
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Default G.W.Edwards BBC Tuning Signals and more

https://ietarchivesblog.org/2017/03/...-laboratories/
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Old 3rd Aug 2017, 6:04 pm   #2
Panrock
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Default Re: G.W.Edwards BBC Tuning Signals and more

Fascinating. Thank you.

Presumably those were 441-line German cameras in 1939?

Do you know when the more elaborate BBC Tuning Signal (shown at the bottom) took over from the simpler one (also shown - on a strip of film)?

I hadn't seen the test picture showing the 1930s couple before.

Steve
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Old 3rd Aug 2017, 6:39 pm   #3
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Default Re: G.W.Edwards BBC Tuning Signals and more

Hi Steve,

Yes, the camera appears to be 441 line.
http://www.earlytelevision.org/image...n_tv2_1939.jpg

The tuning signal was certainly in use in May 1938.

http://www.nostalgiatech.co.uk/Home%20Made.jpg

Peter

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Old 3rd Aug 2017, 7:23 pm   #4
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Default Re: G.W.Edwards BBC Tuning Signals and more

Interesting to see that the Test Card C has the 4 :5 aspect ratio that the 405 system originally used.

I remember an early 1950's book on TV saying that, before watching an important programme, your set should be switched on for half an hour to stabilize before adjusting the focus.
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