Gday Greg
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A very interesting link Peter. That seems to be the future of mounts. More accurate encoders are becoming more common as an option for mounts.
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I agree that more accurate encoders are the way to go, but you also need to consider where in the design chain they are used.
If i understand it correctly, the TDM is an aftermarket unit that effectively sends precise guide commands to the scope. Thus the system is still at the mercy of how the mount handles guide commands, unless it totally replaces the hosts motor control system.
If a hi prec encoder is designed into a mount from day one, great, but how you meld an "add on" into a variety of "proprietary" scopes may have interesting consequences.
Considering most mounts already have a PEC ability, i always wondered why someone didnt put a "mid precision" encoder onto the worm.
Assuming say a 180 tooth worm wheel, and that you could make a PEC model up, you could get away with a 180x less precise encoder for the same tracking accuracy, and have no need to fix anything to the RA or DEC axles, thus making a much simpler installation.
As the encoder is on the worm, any gearbox PE is eliminated,
and a single turn PE model can be used for the remainder.
Much much cheaper for a "retrofit" type installation.
Thoughts????
Andrew