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Although there's not a manual associated with the ebay listing, it does mention that all the color/video elements are adjustable, and there is a menu button with nav buttons on the side.
What happens when you adjust the signal parameters while viewing with your scope?
The menu may only be visible on the pass-thru VGA monitor, or also on the composite output. Additionally, performance may be hampered if the VGA pass-thru is not terminated.
There are also switches on the side... No labels, but they're likely not there for nothin'.
Good luck!
Chip
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