Q: Did you run PEC while your autoguider was running?
A: Yes the autoguider was running while training the PEC. The reason I trained with the auto-guiding on (AKA tracking a star) is because in the celestron "PECTool" program it states the following -- "With an auto-guiding CCD camera - Find the worm index, then auto-guide on a star. Train while auto-guiding to record the corrections." You stated that we want to record with auto guiding off?
- You stated " The graph is showing your RA axis not correcting right away ... it's taking 2 minutes for the RA corrections to stop the "down" error,
and then another 2 minutes before it starts correcting. That's either really bad backlash or your settings are not good in PhD."
- My response: Per celestron tech support they instructed me to PEC train the mount with anti-backlash turned off. PHD setting were at default. I tinkered with them some but it had no result on the graph as shown.
- You stated: "The graphs are showing an error of 3" peak-to-peak... that's really good for an AVX (or any mount)."
-My response: I dunno how that can be really good for an AVX as I cant go more that 10-15 second exposure with out getting star trails/blurring of the image. Also I have a friend with a very similar setup, C8, AVX, SSG, 50mm guide scope, FR 6.3, and a canon 600D. He showed me his logs from PHD and they are SMOOTH!!!, find the smoothest part of the DEC line in my graphs and that is how his DEC and RA lines are for hours at a time. Either way, how could "...error of 3" peak-to-peak... that's really good for an AVX..." be good if I cannot image more that 10 sec subs?
- You stated: "This makes me think you had your autoguider turned on, sending corrections to the mount.
If so, and you're using that curve for your PEC curve, you're PEC is not going to compensate for your RA axis errors, but for your guiding errors."
- My response: That is correct my auto-guider was on and tracking a star. I did that per the instruction from celestrons "PECTool". The instructions read as follows : "With an autoguiding CCD camera - Find the worm index, then autoguide on a star. Train while autoguiding to record the corrections."
- You stated: "Next time you can image, try it without PEC. Just use the autoguider and nothing else."
- My response: I will do that, However the very first time I ever attempted to image, I got graphs exactly as shown in the picture. This was before I ever knew what PEC was or for that matter turned on, but I will try it just to rule it out.
- You stated: "If you really want to use PEC, record a curve with the actual guide pulses turned off (PhD has a setting for this, in the 'brain').
What you'll get is your mount's periodic error, without guiding corrections interfering."
- My response: I will try this as well.
You stated: " yes, make sure your anti-backlash settings are high enough"
My response: Celestron tech support said not to PEC train with anti-backlash. But for the record I have PEC trained the mount with anti backlash, it made zero difference, I got exactly what you see in the attache image. once celestron support heard that I PEC trained with anti-backlash on they said not too because it interferes with getting a true PEC.
I would also like to thank all for being willing to help in this issue. Thank you so much. When I finally get the AVX working or give up and buy another mount. I'll be sure to share the images.