1 reply to this topic

[unbreakable goose]

Hi everyone,

Lately I've been having trouble with my guiding on my cgx. There seems to be a back and forth motion in the Dec axis -- the period is roughly 2 minutes, although I haven't looked at it in detail yet.

My guiding graph is not that great, with a total error around 1.1"-1.3" usually.

Over the course of an entire night, the stars stay fixed in the same location, and they are essentially elongated.

I haven't done any thorough investigation yet, but I wanted to get your guys opinion. On the next clear night I'm going to check for backlash in the Dec gears, and possibly try and fix it if I notice any substantial amount.

If you were in my situation, what would you be doing to tackle this issue?

[rgsalinger]

First, post the PHD log here. 

 

Also, determine that the elongation is in the DEC axis direction. Then, if it is, run the PHD guiding assistant to measure the DEC backlash. Now dial it in and be happy. 

 

Of course first you focus the system and polar align it accurately or all bets are off. 

 

Without knowing the focal length of your system, that may or may not be good enough guiding.