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Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions. |
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27th May 2006, 3:19 pm | #1 |
Retired Dormant Member
Join Date: Jul 2005
Location: West Yorkshire, UK.
Posts: 1,700
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Obsolete Standard Details Wanted
Hi,
I can find information on the French/Belgian 819-line standard, but the details of a couple of others are eluding me. I'm intending to work out X modelines for these so I can put the information on the website. To do this I need full details of the timings of the video waveform. For CBS field-sequential colour I have the following details:
The RGB combiner used for monochrome standards is not a lot of use in this case; what is needed is a circuit to sequentially select the red, green and blue video signals from the computer and generate and insert the correct syncs - not too difficult. What will be more entertaining is I'll also have to build a set for it - hence some of the discussions elsewhere about modifying sets for somewhat odd and rather high line/field rates Also, I only have the following information for other standards:
I'd appreciate detailed information on any other standards anyone can come up with; 405, 525, 625 and 819 (and probably 240) I've got covered Regards, Kat |
27th May 2006, 4:54 pm | #2 |
Dekatron
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
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Re: Obsolete Standard Details Wanted
Hi Kat,
The 1935 German 180 line standard must be (apart from the number of lines) similar to the Baird system. A single broad frame sync pulse and say, an 18 line long frame blanking period. DFWB. |
27th May 2006, 8:31 pm | #3 |
Dekatron
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,273
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Re: Obsolete Standard Details Wanted
Here's the US 441 line standard
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28th May 2006, 1:47 pm | #4 |
Hexode
Join Date: Jul 2004
Location: Michigan USA
Posts: 325
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Re: Obsolete Standard Details Wanted
Here's the CBS Color Standard. The additional red color frame sync pulse was not actually used by the CBS sets. They had a push button the operator would use to get the wheel to lock to one of the three possilities.
Darryl |
28th May 2006, 3:14 pm | #5 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
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Re: Obsolete Standard Details Wanted
Didn't the first men to land on the moon use a colour TV camera with a rotating colour filter in front of the lens?
Anyone know the standard for that? I doubt there's much source material.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
28th May 2006, 8:21 pm | #6 |
Retired Dormant Member
Join Date: Dec 2003
Location: North London, UK.
Posts: 6,168
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Re: Obsolete Standard Details Wanted
The camera on Apollo 11 was monochrome. 325 lines, 10 frames per second. The secondary source I am using does not say whether interlaced or not. Subsequent Apollo missions had a camera with colur wheel in the CBS style. I don't know the resolution. All the cameras used a vidicon tube.
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