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[TowerTalk] Yaesu G-800S rotor calibration problem

Subject: [TowerTalk] Yaesu G-800S rotor calibration problem
From: Rich WA1TRY <>
Date: Sun, 05 Jun 2011 18:06:19 -0400
List-post: <">>

   First time here on the reflector.  Have been browsing the archives 
for a few days now trying to find the solution to my Yaesu G-800s rotor 

   I bought this rotor several years ago.  It was part of a consignment 
sale and was told it was never used.  And in fact it looks brand new and 
has never been installed.  I did not get a manual with it.  A friend of 
my has the same rotor and I was able to borrow his manual.

  The problem is that the manual is for three different rotors and the 
instructions for testing and aligning don't match the physical 
properties of my 800.   They are talking about adjustments using a few 
pots and a two-position slide switch to turn on and off the calibration. 
  But my control box only has ONE adjustment (called Full Scale Adj.)

The problem as best I can describe it, is that the rotor and dial in the 
control box don't seem to be in sync.  I have the rotor on my bench and 
set it to one position, say at 0 degrees.  Then using the controller I 
turn the rotor until it is exactly 90 degrees from it's starting point 
.. and the meter reads 70 degrees.  I've tested it and when the rotor is 
physically pointing at 180 the dial is at 140.  When the rotor is at 270 
the dial is 210.

I'm hoping some one out there can give me the proper instructions to get 
this thing aligned.

I've played with removing the bezel and adjusting the dial, checked the 
voltages, also putzed with the full scale adjustment.  I don't think it 
is a slipping belt (read a lot about that)  If it were the belt, then it 
wouldn't be out the EXACT amount after dozens of tests.  And if it were 
a slipping belt, it would have to be slipping in one direction only as 
when I turn the rotor back to due north or zero, the meter then shows 
the correct dial position.

Starting at zero and running the rotor 360 shows the meter off quite a 
bit showing a reading of 290 degrees.  But running it all the way back 
to 0, and the meter ends up right at zero.

Thanks - Rich WA1TRY

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