PHD2 calibration and harmonic drives

[Gianluca Rossi]

I just wonder whether the larger periodic error of harmonic drive can affect PHD2 calibration. A friend of mine that has a strainwave mount gets poor calibratrion. PHD2 indicates that the AR and DEC guiding rates differ by an unexpected amount. I attach herewith the screenshot as I have no file log. As strainwave mounts should have zero backlash may I assume that this is normal because of large periodic error in RA or there is probably something wrong with the mount?

Thank you

Gianluca

[Brian Valente]

Gianluca

your friend should submit their logs to the forum for questions like this

Its unlikely PE is an issue here. One of the problems is calibrating at 51°, far from the ideal 0°. They should start by running a calibration via the calibration assistant and submit the logs. 

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Brian 

Brian Valente

astronomy portfolio https://www.astrobin.com/users/bvalente/ 

[Bryan]

Gianluca

The most efficient path for your friend to provide the logs is below.  It is an easy way to provide both Guide and Debug logs with just a few clicks.

To get help with PHD2, please upload your log files - here's how: How to ask for help with PHD2. 

Bryan