Hi Ray, Not worried by “tube currents” – it is a 14.5” truss rather than a solid tube. A little reluctant to experiment with greatly offsetting the polar axis, after spending around 6

Hi Eric, Thanks for the great feedback! I am glad you are happy with the results using PEMPro! -Ray Gralak Author of PEMPro Author of APCC (Astro-Physics Command Center):

Hi Curtis, > * Damaged worm wheel teeth. > > The curve looks smooth to me. I'd think it would show some > irregularities if the worm were damaged. But you > looked at my logs.

Hi Joe, Even if PEMPro happened to chose Saturn or Jupiter, I do not think they are moving fast enough in declination to matter. -Ray Gralak Author of PEMPro Author of APCC (Astro-Physics Command

Hi Joe, If you want to confirm your findings, and that you aren't getting fooled by something else like tube currents, try purposely offsetting the polar alignment by a large amount in both Alt and

Happened to me to a few times in my first couple of months with the mount. Make sure you learn how to setup find home within APCC and know how to use it. Terri

Last night our transparency conditions were not the greatest, but seeing was good so I though I'd do a PEMPro for my 2017 Mach1GTO. Initially I was a bit let-down after seeing the +/- 4.7 arc/sec of

The curve looks smooth to me. I'd think it would show some irregularities if the worm were damaged. But you looked at my logs. What do you think?

Totally agree with you Ray. I like to do as you suggest, stick to rotation reference rather than east/west positional. Perhaps a good analogy is thinking how to steer an outboard motor boat.

Ray, One thought came to me during my problematic runs – the major planets (Jupiter & Saturn) are very close to the meridian right now, slightly south of the equatorial. This won’t matter

Yes Ray. We’re on the same page, and I’ve got my bearings. It is a standard “Push-Pull” system. Screwing-in the right side knob (on the west side on an AP-1200), where the AZ

> Can the dew heater cause a non-stable drift alignment? Taken from PEMPro’s polar alignment checklist: -Ray Gralak Author of PEMPro Author of APCC (Astro-Physics Command Center):

Hi All the bolts were tightened each time I changes as or alt. I'll try again, the next free night, no heater on, and use you're trick for the altitude. Thanks for the hints.

Not tightening all the bolts can cause what you are seeing. Plumes from a dew heater can add to that. Rolando

Ray, I have two separate question threads running... one for PEM and one for polar alignment. This one is polar alignment. Can the dew heater cause a non-stable drift alignment? It seems to go all

No, that is extremely unlikely. -Ray Gralak Author of PEMPro Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro Author of Astro-Physics V2 ASCOM Driver:

Yes, dew heaters can potentially cause tube currents and random drift, but that is not going to cause a 3x fundamental frequency. -Ray Gralak Author of PEMPro Author of APCC (Astro-Physics Command

Then maybe the frequency might not be exactly 3.0x and thus cannot be corrected by PEC. I suggest you contact Howard at A-P directly, as he probably can look up the mechanical details on the 600

Unfortunately, East/West can be ambiguous. The scope is pointing roughly South, so rotating the telescope's pointing position West actually rotates the polar azimuth position East. To try to

This is not a matter of polar alignment. There are other things, like tube currents and local seeing conditions that can cause weird irregular drift. Irregular drift patterns can affect polar