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[TowerTalk] Yaesu Rotor Problem

Subject: [TowerTalk] Yaesu Rotor Problem
Date: Tue, 13 Mar 2007 13:30:57 EDT
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I know this subject comes up regularly, but maybe my exact symptoms will  
ring a bell for a good startpoint in troubleshooting my G-800SA  problem.  It 
about 200 feet of cable between the controller and  rotor.  When put up new, 
it set up fine and the "full scale adjustment" was  perfect throughout full 
rotation.  Six months later, just by chance, I  noticed that it was way off 
at some headings.  Everything is fine  mechanically--no slipping, no binding, 
smooth rotation.  But,  in recalibrating the "full scale adjustment", I found 
that with full  CCW on the adjustment pot, I was still 10 degrees short of 
lining up at the  desired 180deg point in the process--ran out of pot 
Starting at full left on the rotor, ROTATING to full right, the  following 
are the readings:
Cntlr  Actual Hdg    Diff
180      180         0   (full  left)
270      265        -5
360      340        -20
030     360        -20
120    120         0
170      180      +10
210      245        +35
225      270        +45   (full 450deg rotation to right)
I am guessing I took a power spike/lightning surge on this hilltop  QTH.  I 
just finished tearing down and fixing an internal mechanical  problem on a 
G-450XL rotor, so I am comfortable tearing into this unit.  MY  QUESTION:  
know the "likely" problem with readings such as  above?.  Should I start with 
the control unit, or the rotor  itself, or something else?
Thanks, Steve, W5KI
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