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He's using a digital scope, so I don't think sweep inhibit is going to work. It's not going to get brighter if the sweep pauses. I think he'll need to use the z-axis option.
Can you take a couple steps back so we can see how you have the cables connected?
I'd also go with a lower frequency than 50MHz. You goal is to align a set with 22MHz IF. The higher the frequency, the more strange effects pop up.
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