Hi David,
Took your PEMPro data and ran it through on my laptop. I just wanted to see what kind of value range you were seeing in the Y axis, and the drift up and down is not that bad. I would say your polar alignment and seeing conditions were decent. PE of +4.6/-2.5 is fairly tight, but the RMS of 3.25 makes the data a bit rough. Then I am getting a correction curve of 7.12 peak to peak with RMS 2.4. I would probably be satisfied with this curve myself and would use it to program the mount. If you have already have done this and are using PE checked, your guiding results should have changed a bit.
But the Frequency Spectrum is showing your 76 error is larger than the PE as you already presented. Just to illustrate, my last PEMPro run that I did is below. Note the largest error is from the worm period. But since your mount has spring loaded worms and mine does not, a curve from someone who has one like yours might be a better base for comparison. Maybe someone will jump in here with one of their curves.
If you program your mount with the curve generated, you'll compensate for the PE but the 76 second error will remain. This error probably won't be fixed by anything but a mechanical adjustment to the mount. If this error is affecting your photos, some physical action would be needed; PEMPro or PHD2 won't remedy as far as I know. Feedback from HGM as to what they recommend under your warrantee situation will be a big part of your solution.
Hope you find a positive outcome.
Regards,?
John
