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Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions. |
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18th Jul 2009, 9:36 am | #1 |
Retired Dormant Member
Join Date: Jul 2007
Location: Bangkok, Thailand
Posts: 4
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German 180 line TV standards.
(Split from this thread; https://www.vintage-radio.net/forum/...ad.php?t=42854 )
Gents, Although a member for more than one year here I've posted little. My time has been predominately been taken up by NBTV activities and the associated forum. However some time back one of the members of said forum, (Dr. Zarkov, aka Volker), made reference to the German 180-line system which I was unaware of. I was very interested as it's a nice stepping-stone between NBTV (in my case 32, 36, 48 and 72 lines) and 405. The same could also be said of the Baird 240-line system. But there's precious little information to be had. I have the fundamentals, 180 lines, 25fps, no interlace and 5:4 aspect, slightly landscape. Left to right line scanning and top to bottom frame scanning. That's it. If anyone has more data, especially the blanking and sync timings, both horizontal and vertical I would be most thankful. The sync to video ratio too. If not I'll make a guess based on standards from that era up to say the 50s. Now what I build is new, no restoration, there are others here whom I could never match. My things are industrial, agricultural and downright butt-ugly, (ask Steve Ostler) but I like think of interest. I use a mixture of valves/tubes and sand-state devices as takes my whim...and to a large degree what I can get. So if anyone has more data on the German 180-line system beyond the above...please? Steve A. |
18th Jul 2009, 1:31 pm | #2 |
Hexode
Join Date: Jul 2004
Location: Michigan USA
Posts: 325
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Re: German 180 line TV standards.
Hi Steve,
I have never found a timing drawing, but did find the information in a German text as follows: 180 lines, 25Hz, progressive 169 active lines, 11 blanking lines (1 broad pulse) 75:25 video:sync ratio 2.2us front porch, 20us line sync, 2.2us back porch (197.8us active line time) If anyone would have an original timing diagram it would be Eckhard (yagosaga). Hope this helps, Darryl |
18th Jul 2009, 3:40 pm | #3 | |
Nonode
Join Date: Feb 2005
Location: Worcestershire, UK.
Posts: 2,534
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Re: German 180 line TV standards.
Quote:
Back to 180 lines. I have some Wireless Worlds somewhere with off-screen pictures of the 1936 Berlin Olympics. As I recall Farnsworth cameras were used and the results looked somewhat 'smeary'. Steve
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18th Jul 2009, 7:29 pm | #4 |
Dekatron
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,274
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Re: German 180 line TV standards.
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19th Jul 2009, 12:25 pm | #5 |
Heptode
Join Date: Mar 2009
Location: Portsmouth, Hampshire, UK.
Posts: 674
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Re: German 180 line TV standards.
I can't find any more details but these may be of interest.
Taken from 'Television Today' published circa 1935. Sorry for the quality but I didn't want to risk the spine on a flatbed scanner. Jim |
27th Jul 2009, 1:51 am | #6 |
Retired Dormant Member
Join Date: Jul 2007
Location: Bangkok, Thailand
Posts: 4
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Re: German 180 line TV standards.
Thanks Gents,
That is exactly the information I was looking for! I have no idea as to when I'll get around to this, it seems every other day I add to my 'to do' list and this 180-line thing keeps getting pushed further and further down it. One day. But now when the revolution does come I now have the data, thanks again. Steve A. |