After heating with a heat gun and cooling with freeze spray, everything in the rack (and also bypassing the diplexer), nothing made a difference in the appearance (and disappearance) of the crackles other than transmitter ON time.
Looking at the output of the PA with an SA doesn't show anything out of the ordinary either. And (I think I posted this before), the TX time to warm things up can come from either the UHF or VHF repeater, would seem to point to either the antenna and/or feedline and their connections.
As the UHF side of things never has cracklies, I feel I can rule out the feedline and various connectors and pin it down to the antenna. Is my logic flawed?
Ken
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Ken Arck AH6LE