[amsat-bb] Re: Tracking - End-stop Problem

Erich Eichmann erich.eichmann at t-online.de
Mon Feb 8 06:45:32 PST 2010

Hi Clive,
I sent you the following message off the list but my mail was returned by 
the mail delivery system.

SatPC32 supports the 450° range of the G-5500 (to avoid a full turn of the 
azimut rotor when  the satellite passes your location in the North).
You can choose the 450°  in the menu "Rotor Setup". To make the option 
available the max. elevation must be set to 90° and the rotor turning point 
must be set to "N" (for

73s, Erich, DK1TB

----- Original Message ----- 
From: "Clive Wallis" <amsat-bb at g3cwv.co.uk>
To: "amsat" <amsat-bb at amsat.org>
Sent: Monday, February 08, 2010 11:17 AM
Subject: [amsat-bb] Tracking - End-stop Problem

> Hi,
> A problem that I've had for many years is how to track when the
> satellite's azimuth crosses across the rotator's end-stop,  ie. when the
> azimuth changes from 0 to 359 degrees.
> My rotator turns between 0 and 450 degrees, so it should be possible to
> use  angles between  360  and 450  to  overcome a sudden  transition
> from  0 to 360 degrees.
> As the pass data is  available within the tracking program, it should be
> feasible to deal with the problem in the program.   Do any tracking
> programs include this feature?
> A possible solution would be to use a small PIC between the computer and
> tracker, which could modify the commanded azimuth.
> I'm using a Yaseu 5500, LVB tracker, Sat_Explorer tracking program and
> WinXP.
> Any help,  suggestions or comments would be most welcome.
> 73     Clive    G3CWV
> Hitchin, North Hertfordshire, UK
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