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Old 02-03-2024, 12:03 PM
bhegges bhegges is offline
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Join Date: Oct 2008
Location: Sioux Falls, SD
Posts: 135
Did some more testing and while I initially thought the polarity was correct it might not be. From the bits and pieces of out of sync image I see inverted colors.

Assuming the negative drive on the VA62 implies an inverted output this aligns with what I am seeing but I would expect the signal to then be in sync. Also tried to feed the VA62 inverted signal through the op-amp to add the DC offset but that did not help.

Pulling the 3rd IF tube seemed to help and could almost get the picture to sync. Is there something related to AGC or other signals from the IF that are needed for the sync circuit?
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