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I’ve been using the PHD2 predictive PEC algorithm on 3 different mounts over the last 6 years
You can either manually enter your worm cycle period of your particular mount by calculating the value yourself ( see below for the 3 different mounts I’ve owned ) or let PHD2 calculate it after tracking for a couple of worm periods by ticking auto adjust box in PPEC algorithm tab
When PHD2 calculates the value it’s always slightly different than mathematically calculating it , but only by a second or two .
Worm Cycle Periods
Earth Sidereal Day = 86,164.1 sec
Worm Cycle Period
Sidereal Day (sec) divided by number of main worm drive ring teeth
HEQ5
86,164.1 / 150 = 574 sec or 9.6 min
EQ6-R
86,164.1 / 180 = 479 sec or 8min
EQ8-R
86,164.1 / 435 = 198 sec or 3.3min
NB: The above worm cycle periods do not factor in any periodic error or inefficient worm gear meshing
Is the above what you’re looking for ??
Cheers
Martin
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