[amsat-bb] Re: Yaesu G-5500 Azimuth Rotator Fluctuation Problem

Sun Feb 17 15:33:14 PST 2008


Hmmmm.  I am not familiar personally with the ARSWIN, other than it has a
good rep.  So if you see the hunting with the ARSWIN program, then that is
the place to solve the problem.  It would not be unreasonable for there to
be the equivalent dead band adjustment there, as in most such programs, but
I would be guessing beyond that.  Perhaps someone here has the needed
experience.  Otherwise, drop a note to Pablo.  He has a great record of


Hi Alan
The fluctuations are observed without the tracking program.  Are you
familiar with ARSWIN interface program?  I can see the fluctuation when I am
using ARSWIN to calibrate the rotators in particular the Azimuth section.  I
calibrate and set the minimum and maximum setting for each rotator.  It is
prevalent during this process.  
I am using Nova.  Where would the dead band be defined in this tracking
Thank you.  I would be so pleased if this is just an adjustment. 
-------Original Message-------
From: Alan P. Biddle <mailto:APBIDDLE at UNITED.NET> 
Date: 2/17/2008 5:12:10 PM
To: AMSAT-BB at amsat.org
Subject: [amsat-bb] Re: Yaesu G-5500 Azimuth Rotator Fluctuation Problem
There is nothing in the rotator which should normally cause the problem.
All tracking programs have a place to set a "dead band" which defines when
the antenna is "close enough" to the calculated value.  If that dead band is
set too narrow, or to zero, the controller is likely to hunt back and forth
as you describe.  Depending on your array, a window of a few degrees should
be fine.  Something to test, in any case.
Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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