Quote:
Originally Posted by old_coot88
Quote:
Originally Posted by CaryLee
I know this is a long shot, but are there any "old time" do-it-yourself" processes for video alignment for folks who didn't have scopes and signal generators and such? I'm kind of having to make this up as a go along, but maybe I'm "re-inventing" the wheel.
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The fact that you've got a watchable picture on the set is nothing short of a miracle and testament to your Granddad's indomitable spirit and admonition to "dig in and do it." It's virtually fulfillment the Sea Bees' motto:
The difficult we do immediately
The impossible takes a little longer.
My hat's off to you Sir. I would never have even attempted it.
The usual symptoms of misalignment are loss of fine detail in the pic, smearing-out and ringing of the vid signal. The best advice at this point would be to not try to "improve" upon what you've got. |
There are a few "cheat" like alignment techniques. The SOP for most sets is to use a FM sweep generator(only a TV specialized version there of), an AM signal generator for markers, and an O-scope, but early on some makers published data on how to do it without the sweep generator on some sets...
A slightly better cheat (if you no gots test equipment) was IIRC was originally described for the Sencor VA-62. One can attempt to visually align the video IFs of a set if it is displaying a 'multiburst' test pattern which is basically a pattern of black and white vertical bars that become thinner from left to right. If you align your set with that pattern (and a audio test tone to make sure you don't kill the sound while working on the picture) I believe the procedure is something to the effect of get the thick bars clear, then try to get progressively thinner bars clear while keeping previous ones good.
The thickness of the bars basically corresponds with the frequency they produce so the thinner the bar the higher the frequency (it is often used to test video response in home theater applications). You could probably buy or burn a test disc with a 'multiburst' pattern cheaper than you could get the right equip for the factory proceedure.
Personally I tend to agree with coot on not messing with it any further, but if you are not worried about messing up your progress trying to get more or just want a yard stick of how good you did then the multiburst method may the thing for you...