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Old 09-23-2013, 07:25 AM
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jhalphen jhalphen is offline
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Join Date: Feb 2007
Location: Paris, France
Posts: 587
Hello Scott,

Of course i still have the files, backed-up several times. When you spend many hours doing Scans, you don't want to loose them!

Give me your Mail address by MP + max inbox file size and i will send you everything concerning the CKC-021 color viewfinder.

I don't think your planned conversion will work. The electron beam scanning speed is linked to the phosphor strip width and pitch. This is optimized for 3.58 MHz NTSC subcarrier. A tube for PAL would require a different strip pitch to coincide with the PAL subcarrier at 4.43 MHz.

see the illustration here, bottom of page 3 of this thread:

http://videokarma.org/attachment.php...3&d=1278374924

Secondly, the viewfinder contains several highly specialized analogue ICs which Hitachi developed for the color VF. A PAL version would require duplicating the IC's internal circuitry with discrete transistors and each IC probably has over 100 transistors on the chip.
BTW, these ICs are unfindable. I need a HM11759 Color Processor chip and have tried for several years with no success.

Finally, i do not agree about your comment concerning PAL to NTSC converters. I have several units purchased at around 150 Euros which truly convert 525/60/3.58 to 625/50/4.443 and they work fine.
Think about it: the resolution of a 1.5" color CRT is pretty weak anyway, it's not a 25" CRT or bigger size flat screen.
Mine have a 6Mb interpolation memory (reduces judder in horizontal camera pans).

I would keep the VF as is and convert composite PAL to NTSC.
Been there, done that and quite pleased with the results.

Best Regards
jhalphen
Paris/France

PS: @e-type2, thanks! for your offer to help Scott.

Last edited by jhalphen; 09-23-2013 at 07:34 AM.
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