My TR7A has full power output on all bands. On 40 SSB, I noticed that if I increase the mike gain too high, or speak too loudly, some sort of power protection relay trips, and the 12 V supply is interrupted to the rig. The rig goes dead until I wait a few seconds and turn it on again. I looked at the schematic, and all I can see is a VCO "unlock" signal that would possibly do something like this, but it's really a mystery to me. I thought that perhaps the rig is drawing too much current on this band. Operation on 20 and up is normal, and I can modulate fairly heavily with no problems. Is there some kind of PS7 current protection circuit? I can't see anything on the schematics. Any thoughts welcome before I tear into this thing.
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