10-09-2021, 01:00 PM
(This post was last modified: 10-09-2021, 01:09 PM by peter scott.)
Hi Adrian, I was puzzled by the twinned verticals at the top left and bottom right of the test card. I assume that the two different positions of the verticals are from differences in the two 202.5 line half scans. This suggests to me that HT ripple might be the cause. That said, I was wrong to suggest that it was an effect on the frame scan. If the effect is varying then perhaps mains ripple on the line scan but if static then the frame rate modulating the line scan.
Do you have an isolating transformer and a 'scope? If so perhaps you could look for ripple on the line output HT?
Peter
https://youtu.be/DIbJUKFLPzs
Apologies for starting a separate thread:
https://golbornevintageradio.co.uk/forum/showthread.php?tid=8548&pid=93928#pid93928
Do you have an isolating transformer and a 'scope? If so perhaps you could look for ripple on the line output HT?
Peter
https://youtu.be/DIbJUKFLPzs
Apologies for starting a separate thread:
https://golbornevintageradio.co.uk/forum/showthread.php?tid=8548&pid=93928#pid93928
