Hi. I am trying to sort out a particularly annoying Dec guiding issue. I have an EQ5 with belt drive and NEMA14 stepper motors, and have entered my config in AstroEQ. The mount slews fine, and guided by PHD2 it tracks well in RA with RMS values of below 1arcsec. However my Dec tracking is all over the place, the guidelogs show PHD2 applying repeated moves of 2-15 msecs, nothing happens for ages and then there is a massive sudden overshoot.
In trying to diagnose it today in daylight by "manual guiding" in PHD2, I have noticed that both in normal RA sidereal tracking, and in Dec manual guiding, there are groups of 3 pulses (sounds like a rapid ratttle) going to both RA and Dec stepper motors. So RA sidereal tracking is proceeding in a series of small jerks, I would expect single evenly spaced pulses.
Equally when I apply 100msec Dec moves from PHD2 manual guiding, I get no reaction for 3-4 presses of the N or S button, and then a rattle of 3 steps. This and the fact that my Dec guiding is jerky may not be unconnected....
I'm thinking I must have messed up a parameter somewhere, but I'm damned if I can work out which one.
Any and all advice appreciated!
Paul Evans