The first step I'd take would be to recalibrate the AIM and make sure
the settings are correct.
Mine is so sensitive that I can see the right most two digits move with
the wind. That's on a 1.0xx SWR. The resistance and reactance also
play a part.
My 4170C is very sensitive to calibration and settings although I've not
experienced differences of a magnitude like you have.
I too have a cantankerous vertical. It worked great until the wasps
built a nest inside the matching network. A few got across the coax
connector and were fried. That brought their buddies to the rescue who
were also promptly fried. I actually had "bee goo" through the
connector and several inches down into the coax. I had to clean the
network, rebuild it and it's still not right. A second AV640 installed
at the same location acts the same, so I believe it's something external
to the antenna.
However, the SWR bridge in the tuner and rig agree (more or less) with
the AIM.
73
Roger (K8RI)
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