[Moon-Net] SPIDs

Peter Connors sronnocfp at gmail.com
Wed Nov 2 14:57:01 CET 2016

This is of  interest to me because I am in the process of assembling an 
eme station using the RAS with a ~80m cable run so I have searched the 
internet (and the Moon-net archives back to 2012 so far) for 
information. While there are significant differences in systems that 
experience problems/no problems there is no single definitive source of 
information on 'the right way to do it'.

 From what I have read, the difference in the outcome for different 
stations appears to be affected by whether the RAS is HR (which appears 
much less noise immune), the motor cable size/resistance, power supply 
regulation, psu sharing between the controller and the motors, the model 
of the controller, the sensor cable construction and its 
screening/earthing. The degree of mechanical imbalance/inertia in the 
array will also affect the startup currents and thus the voltage drop 
and/or noise spike in the system. Anything I have fogotten? Maybe the 

What one station will 'get away with' is not always replicated by 
another with different system values, and the lack of a full set of 
parameters can leave a Spid user in the dark. Meanwhile, the information 
search turns up all sorts of useful stuff - and its fun!

Pete, G4PLZ

On 02/11/2016 11:09, Bjorn wrote:
> Some areas of interest pops up at an "even timesppread basis", and has 
> almost the same content every time. Maybe creating an archive type of 
> wiki would be a good plan?
> But anyway, time for a repeat:
> I am running approx 19V to my RAS/RAK rotators. Good cabling (of 
> course shielded) and good power/cabling in the PS-line, No zeroing of 
> directions at powr faults and no problem starting both az/el at the 
> same time. No lost pulses. Be aware that the motor can take up to 10A 
> in the startup spike, so starting both at the same time = could be up 
> to 20A, if voltage drops too much = lost pulses.
> 73 de SM7SJR, Bjorn
> _______________________________________________
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