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All:

Please note this (trimmed) frame from the video just as the amp is tripping. If you simply play the video you might not be able to see this but if you step through you'll see that the frame is there.

This would normally cause one to suspect that something after the amplifier is intermittent, but I suppose it could be an amp issue of some sort. Another less likely possibility is that there is a burst of off-frequency signal being fed to the amp or caused by the amp that is resulting in an actual high SWR. In any case, the amp is tripping because it really does seem to think there's an SWR problem.

Note that these kinds of problems can be power dependent and not show up at lower power.

My suggestion is to start with a different cable from the amp and run that direct to a known good dummy load to see if there's an issue that way. I suspect it will be fine. If not, try another radio to drive the amp and as a last resort call Palstar.

Chuck - N8DNX

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