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Various LPF settings will remain the same from 2x all the way to 5x. The best possible picture resulted from the following settings:
Video in proc )
Video LPF = 9 MHz (SDTV)
Sync opt. )
Analog sync LPF = 10 MHz (med)
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For enabling optimal timing:
Output opt. )
240/288p proc:
Set to your desired line multiple (line2x, line3x, etc.)
Once you decide on your linex scale, you'll need to scroll down to the corresponding "LineXx mode" and change its setting to "320x240 optim.". For example:
If you chose your 240/288p proc to be set at "line3x", you'd need to then scroll down to "Line3x mode" and set it to "320x340 optim." Doing this then opens up the proper "(Adv. timing )" sub-menu back in the "Sampling opt. ) menu".
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With your scaling choice set, it's time to dial in optimal timing alignment:
Sampling opt. )
Sampling phase = 348 deg
(Adv. timing )
320x240 (this is properly set in the "Output opt. )" menu)
H. samplerate = 433
H. synclen = 31
H. backporch = 49
H. active = 320
V. synclen = 3
V. backporch = 15
V. active = 240
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These settings worked great on my Datapath Vision E1S capture card, with the exception of line5x mode. I couldn't get a stable picture when the H. samplerate was set properly to 433. The picture would come back if the H. samplerate was set to an even number like 432, but this knocks the dot sample out of alignment with the graphics. It may just be a quirck of my capture card, and it may work properly on some 4k displays.
-FBX