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

Mon Feb 18 06:34:37 PST 2008

Yes, he does.  I am very pleased with Pablo and his products.  I was
hampered by computer hardware and rotator problems with my G-5500.  It
appears that the AZ rotator may be causing some problems this time.  We work
with fluctuation and it disappeared for a while, but now it is back.  The AZ
is the only part that I have not sent to Yaesu.  I need to find schematics
and part numbers.  I asked for the technical service manual for the G-5500,
but they never sent it to me. 

Thank you very much. There are several adjustments for dead band, i.el
Static, Dynamic and Priority.   
Gary
N0EZH

-------Original Message-------

From: Alan P. Biddle
Date: 2/17/2008 7:05:11 PM
To: AMSAT-BB
Subject: [amsat-bb] Re: Yaesu G-5500 Azimuth Rotator Fluctuation Problem

Gary,

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
support.

Alan
WA4SCA

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
program?

Thank you.  I would be so pleased if this is just an adjustment.

Gary

-------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

Gary,

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.

Alan
WA4SCA

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