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I also had a bit of trouble with PHD calibrating because the guide speed (?) in EQMOD was only at 0.1x sidereal rate, which I think is quite low. It would take ages and occasionally fail. I bumped it up to 0.4x and made adjustments in PHD's step size calculator to account for the change as well. It now calibrates much quicker. Not sure of the impact on guiding quality though.
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