Gday Brendan
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Save yourself the hassle do not use PEC if you are autoguiding they only end up fighting each other!
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Not true in an LX200GPS, ( if done correctly )
PEC is applied proactively as a fundamental speed adjust
It only gets updated once every 2.4 seconds.
Thus, if properly done, it can result in much lower guide adjusts being required for scopes with bad underlying PE.
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and PEC is a arse you have to keep on renewing the data.
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Dunno where that comes from????
For 497 Austostars, if you dont park, yes, it has to be redone
but the LX200GPS uses sensors to resynchronise the worm each boot
This mechanism works quite well, and has been proven in practice.
Andrew