I have a 70cm amplifier that recently showed exactly the same symptoms
described. The problem turned out to be a shorted coax jumper (approx 6 inches
long)
between the amplifier output connector and a coax relay.
The jumper was made of LMR400 and had the weight of two relays and two coax
cables hanging on it. I assume that the center conductor migrated and shorted
to the shield but it was not investigated to be sure.
A new, longer jumper was made of LMR600 and all is now well. The correct
solution will require fabrication of a bracket to support the hanging weight
but
who has time to do that?
73,
Gerald/K5GW
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