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Old 05-21-2019, 11:15 AM
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dtvmcdonald dtvmcdonald is offline
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My point is that using my modulation system, which is wideband in both I and Q on the low
frequency side, the bleedthrough of the wideband Q into the I is quite harmless.
You can see it on test patters but not programs. Increasing the Q bandwidth a bit
(you can't increase it a lot because either the gain gets too low or you get a timing
mismatch) results in a better picture.

So I wonder ... did the NTSC people back in 1951-1953 ever actually try 1 or 1.5 MHz
on the lower side for both axes? That's not counting their PAL or PAF efforts. The PAF
at 3.89 MHz looked pretty good. I'd like to see that set working again and the color
circuits up to the tweek-up quality currently seen in my CT-100 or the ETF's one
as seen at the convention. Remember that the modulation system at the ETF is
probably also wideband on both axes on the low side.

Edit: the restoration thread is at http://www.videokarma.org/showthread...ht=dtvmcdonald
I add this to find it easily.

Last edited by dtvmcdonald; 05-21-2019 at 12:19 PM.
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