Rouz, Again, just eye-balling your screenshot, it looks like PE is now worse. Maybe you need to invert the curve? If you created a new PEC curve and uploaded it to the mount that might take 40+

Hi Rouz, Just eye-balling the screenshot, that value does not look correct. So, try loading your phd2 log into the PEMPro Log Viewer utility, which is designed to measure periodic error in PEMPro

Then re-ran PHD with the new curve. The RA doesn't drift now like it did previously. I see a couple of arc-seconds of plus/minus movement but still better than before.

Made a fresh PEC curve

No not supported anymore. Fernando

Hi, I have an AP900 that I have had for 15 years. It has worked flawlessly. A couple weeks ago I noticed what I thought was a minor DEC backlash issue, so printed out the instructions

Now with the previous PEC curve and PEM ON. Ra error improved slightly to 3.56 arc-sec peak to peak. I suppose I should run PEMPRO again and try for a better PEC curve. -Rouz

Ok, Uploaded PEC from a few days ago that looked good, read from the mount, curve is there. Fine polar alignment. Calibrated PHD with main OTA and camera. Ran guiding assistant for 1000s with PEM

The only thing I would leave out is the guiding part at the end. What we want to see is the shape of the drift with PEM ON and PEM OFF. Once we do that, I can use that info to determine if something

Hi Rouz Can I suggest you do a baseline guiding by following these

Hi Roland, Got it, will do that next. Was waiting for clear weather, the single exposure is from a few nights ago. I'm familiar with PHD and will use that as you have stated below with the main scope

By the way, you don't need a separate guide camera to do this simple test. Just use your main imaging camera to be a guide camera in your guider software. Once you have a 15 to 20 minute guide chart

Up until now we only have the what, but not the why. In order to find the why, I suggest using PHD or MaximDL to generate a guiding chart with the guide corrections turned off. Run the guide software

Roland, I did try with PEM on and all corrections off, including the model. Only got 1 x 300s image and it was quite poor.

I am curious if PulseGuide is still supported and whether or not it will work with my AP1100 AE or my (yet to arrive) Mach2. Shailesh

Yes, trailing stars can cause plate-solve failures. I'm glad you found the problem. In the future, if you have a plate solve failure, you might want to try looking at the image to see if you can see a

Geoffrey, As far as I can tell ASTAP cannot be told which database to use, so there is zero impact. Did you try looking at some of the failed images to see if there is an obvious reason for the

Tracking accuracy will be commensurate with the accuracy and density of the data points. And guiding results may not tell the story as that may be measuring the seeing conditions. There will be a fix

Just bumping this to see of there is an answer for my last question. I've used dec arc tracking for two nights now and have not noticed any difference in my guiding compared to all sky. Although I'm

You are welcome Geoffrey. Glad that helped!