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Old 04-14-2017, 08:43 PM
Kevin Kuehn's Avatar
Kevin Kuehn Kevin Kuehn is offline
Workin' Late Again
 
Join Date: Jan 2011
Location: WI
Posts: 3,824
Heathkit IO-101 Vectorscope/Pattern Generator Insanity .

A nice man gave me this unit a couple weeks back and it's about driving me crazy. I can't for the life of me figure out what's wrong with the composite video signal that's causing the wave at the top of the picture. I have the manual and all the video waveforms look good on my scope. It shows nearly the same symptom on both vintage and modern TV's, and regardless of whether it's connected to the tuner or composite video in on the newer set. This uses the same pattern generator circuit as in the Heath stand alone IG-28. If you fast forward about 11 minutes into this youtube video you'll see this fellows generator exhibits very nearly the same behavior as mine. In fact when I hooked my Admiral 20Z1 chassis up to mine it looks nearly identical to his. For some reason the vertical bars bend to the left on the Admiral. https://www.youtube.com/watch?v=3G1_2XyXfFs










Last edited by Kevin Kuehn; 10-21-2017 at 08:47 PM.
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