Quote:
Originally Posted by PRejto
Hi Aidan,
I would strongly recommend that you upgrade to the latest daily build. This buld has greatly improved guiding and I can see from your guide graph that you are using an old version.
I went back and read your previous post about the out-of-balance near disaster. You said it was mostly a slip in the dec axis so that doesn't entirely rule out a slip also in RA. Did you have a look at the ring gear and any associated damage in RA? Hopefully none, but if there is it might explain your inability to train PEC.
Your .45 resolution is quite good but you would need really good and steady seeing to take advantage. I take it that you are looking at PE again after applying the correction and that you are seeing PE go from ca 6 to ca 4. If you compare the original curve to the corrected curve do they look similar in terms of phase or is the corrected curve different? If different I might guess that the phase of the initial curve is possibly incorrect. But, if similar in phase it might just mean that not enough correction is beng applied.
As far as your polar alignment, it certainly could be better. Also, if your T-Point model isn't large enough Protrack probably won't work very well. A cursory look at your guiding graph has me head scratching. Even with high aggression and a small min move your tracking seems to oscillate above for a while, then below for a while. At those settings I would expect the mount to bounce back and forth from one side to the other. It's almost as if the errors in RA are so large that guiding cannot keep up! But, now I'm seeing something else; your star strength signal is below 80%. That would indicate passing clouds and that will positively mess up guiding especially if your guide star is weak? What ADU are you looking for with a guide star? I usually get excellent guiding around 10K adu. In any case the new DB for TSX greatly improves centroid calculation on weaker guide stars. Oh, you might also find it really useful to rotate your guide camewra such that RA=X. That way you can tell what is going on in both axis. Unlike most other guide programs TSX does not plot RA to X and dec to Y! You probably know that but it has tripped up many! Wish I could help more. Good luck,
Peter
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Thanks for taking the time to respond Peter. i will go through point by point
i am downloading the new version as i type, i will see how that goes
i didnt check the ring gear, i will add it to my to do list when i get down there
yeah i did check it pre and post PEC and that was the figures i was quoting. i cant remember if it was the same curve but i will run it again tonight and see how it goes
my T point model is around 200 images, is this enough? i would have thought so.
i am running another PEC now, i will let you know if the pattern persists, i will also post pictures of pempro to show you what i am getting
i checked my polar alignment using PemPro and it was bang on, so no issues there, the guiding was a little cloude interrupted but i get teh same issues on clear nights.
i agree that the graph is weird that it spends time on one side of the graph then switches over ... i think the posting of my PE curve will help to shed some light on that. anyway i will post again shortly when i have all the details