[Moon-net] Moon tracker for SPID ROTOR

[w2drz]

Hi Berry,

If I understand the pulse method used,
 that is a simple single pulse,
 with a direction selected when the rotor is moved???

If this is the way then there is a inherent problem using that method.

The way for that to be corrected is to use QUADRATURE encoder's.
This will give automatic direction as rotated CW or CCW,
problem solved.

Just a suggestion for a fix.

tom W2DRZ

ve4ma wrote:
> 
> I am sure there are many that do not have a problem.  KM0T and I use the
> rotor for terrestrial service ( up to 24 GHz) and we experience regular
> errors of 4-5 degrees..that we calibrate out and calibrate back in...looking
> forward to an upgraded chip
> 
> Best 73
> Barry VE4MA
> 
> -----Original Message-----
> From: moon-net-bounces at list-serv.davidv.net
> [mailto:moon-net-bounces at list-serv.davidv.net] On Behalf Of David Anderson
> GM4JJJ
> Sent: Monday, March 31, 2008 3:01 AM
> To: F1TE
> Cc: moon-net at list-serv.davidv.net
> Subject: Re: [Moon-net] Moon tracker for SPID ROTOR
> 
> Lucien,
> 
> I'm impressed by your design and work, but I would like to say that we
> have many Spid rotators with controllers in the field that do not
> suffer from the bad precision you describe.
> 
> On 31 Mar 2008, at 08:51, F1TE wrote:
> > Hello
> > The motor  "SPID",  manufactured in Poland,  is a very good rotor
> > for EME
> > antennas.
> > But its controller has a bad precision, due to poor management of the
> > incremental encoder pulses.
> > Drift cumulative display occur and it is not uncommon to find after
> > a few
> > times up to 20° of display error.
> > What miss the moon, even on 6 metres!
> > My tracker at the origin was planned for SPID for azimut and  jack
> > (sat
> > actuator) for elevation, with correction of the linearity of
> > movement for
> > the jack pulses encoder.
> > I developed  a special firmware for the dual AZ / EL SPID rotor
> > giving full
> > satiffaction, manual positioning or automatic tracking via RS232.
> > Without cumulative drift display.
> > http://www.f1te.org/Tracker/trackeur_gb.htm
> >
> > Another motor controllers for the single azimuth SPID rotor  is also
> > described in french
> >
> > http://www.f1te.org/SPID/Controleur_SPID.htm
> >
> > 73, Lucien F1TE
> >
> >
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> 73
> ___________________________________________________________________________
> David Anderson, GM4JJJ         E-mail: david at gm4jjj.co.uk
> ___________________________________________________________________________
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