The fluctuation of current could be the power drawn, being more than the
supply can deliver continuously.
It could be that capacitors in the supply are old and drying out,
cutting the current rating.
It could be the antenna blowing in the wind, and altering its
impedance. How old is the power supply? Electrolytics 10 years old and
older may be on their end of life.
Also check the connections from power supply to the rig. Should be no.
12 wire at least, and lugs should be on tight, and connectors not
showing signs of overheating, or loose connections where they plug into
the rig.
-Stuart Rohre
K5KVH
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