[TowerTalk] Tuning vertical SWR-Analyzer vs SWR bridge

[Roger (K8RI) on TT]

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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