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Gday Peter
In short no. ( Assuming you are Polar )
PEC is done as a simple "baseline" motor speed adjust, once every 2.4secs ( approx ).
Guide speed adjusts then get read "as sent", and just modify the underlying speed.
Hence Having PEC on vs off will not have any "internal" effect in the LX200GPS. The main benefit is if you have a good PEC model, it preemptively adjusts for known errors, hence your guider doesnt have to work as hard.
To turn it on/off use Setup->Telescope->SmartDrive->RA PEC->On/off
If you are AltAz, PEC is broken, so dont bother trying.
Andrew
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