[amsat-bb] Re: inquiry about homebrew az-el systems

PA3GUO pa3guo at upcmail.nl
Fri Mar 8 13:31:57 PST 2013

>Just think -- with TWO of them, you could compensate for the motion of the station, when operating from, say, a 
boat or a vehicle under way.  (Nobody say "GPS" please!) 

Hi Gus, you asked for it :-)
So also here Howard sets the standard, nobody beats him - respect!

Btw: here is my 18 year old project, it still works fine after so many years:

Things I learned and included in my software:
- thresholds are needed to avoid the system oscillating around a target position
- corrections need to be made due to overshoot (after a stop command the rotor takes time to actually stop

Henk, PA3GUO

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