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The results seem to be PE of 4-5 arc seconds - or better with PEC!
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I cant comment on the Celestrons, but as part of writing/testing my PEC editing App for Meades, i have seen quite a large no of Meade curves.
These range from +/-12 arcsec ( best ) to over +/-56arcsec
In the Meades ( GPS/RCX ) there are two major sources of PE,
when talking in the +/-10arcsec region.
The motor gearbox and the worm. The gearbox PE is very complex, but has a period equivalent to three turns of its output shaft ( hence the new PEC system they use )
Sooo, the result you get from PEC training is going to be a function of the motor as well as the worm that was fitted to "your" scope
( and the phase they are connected with )
Doc Clays supercharge effectively blueprints the scope and sets all the meshing tolerances etc
however, the result obtained for PEC training is going to be limited to what gears ended up in the scope. He will probably get the best out of whats there, but the result is still limited to the tolerances of whats fitted.
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I wonder if there is a service that can improve PE by 200% - 300% - why don't Celestron and Meade do it
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A program like PEMPro can create a good PE model,
Doing a train followed by multiple updates in the meade scope will also give reasonable results.
Another option is to do multiple trains and tweak them in an external app and backload ( which is what my app does ) This allows you to see how "consistent" the PEC training is. This is very illuminating.
I have NEVER seen a set of data where two trains gave similar results.
There are always non periodic phase shifts due to tooth spacing errors etc
The Meade gears are apparently flat cut, not true worms, hence there are lots of non periodic effects due to the way the gears mesh.
Bottom line
All the above methods will average this to a best fit, but the final result you achieve will be limited by what gears you got to start with.
Also, for latest GPS firmware (4.2g ) it looks like Meade have inverted the data if yr in the Sth Hemi, which doesnt help either
Andrew