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Old 01-11-2021, 01:32 PM
Startrek (Martin)
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Startrek is offline
 
Join Date: Dec 2017
Location: Sydney and South Coast NSW
Posts: 6,640
Quote:
Originally Posted by Startrek View Post
Imaging below 30degrees in Alt has a higher risk of unstable guiding due to atmospheric instability but doesn’t generally cause random big excursions in Dec or Ra

Random big excursions in Ra and Dec can be caused by -
Dec and Ra Backlash
Period error in your worm drive
Wind gusts
Cable snags
Passing Cloud
Incorrect Guide Settings ( calibration, guide exposure, min mov etc.. )

If your previous guiding has been ok for a while then on the next clear night try some test guiding on a star in the East up at 50 to 60 degrees and see how the mount performs
Also , if using PHD2 , try the PPEC algorithm and guide for 2 or 3 worm cycles ( 20 mins or so ) to see how the mount performs
Are you using PHD2 ?
If so, are you using Version dev 4 or later with Multistar guiding feature ?

Cheers
Martin
Attached are some docs I put together a while back on PHD2 guiding
They may be of some assistance moving forward if you use PHD2
Cheers
Martin
Attached Files
File Type: pdf PHD2 Multi Star Guiding.pdf (22.4 KB, 68 views)
File Type: pdf Advanced Functions for PHD2 Guiding PPEC.pdf (23.1 KB, 68 views)
File Type: pdf PHD2 Guiding Information.pdf (23.8 KB, 61 views)
File Type: pdf PHD2 Guiding Procedures.pdf (67.1 KB, 142 views)
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