Success! That worked Ray.. PHD2 was guiding perfectly...I was getting total rms values averaging .3" and down to .25" at times over 3 hours last night. Seeing was very good, with a light breeze at tim

OK, thanks Ray...I'll give it a try... cheers, Steve

Hi Ray, I reset the AP900 ASCOM mount settings (AP900 and CP2) and tried it out again. Same result unfortunately...logs attached. However, I see that the Mount Type does not get populated in the Log f

Good idea Dean...I took it on faith that the upgrade had been done...although I was given the 'old' chip, so it was upgraded to 'something' :-) thanks..

p.s. your description of the problem seems to match last night's observations on mount behaviour.. I had previously thought that somehow the tracking was being disabled on the mount when guiding was i

Hi Ray, I think I originally had CP2 specified in the mount set up and had changed it to CP4 trying to debug the problem... But to be sure, I'll reset the driver to CP2 & AP900 and give it a try tonig

Hi Ray, ASCOM driver logs attached...thanks! Steve

Sorry, mixed up my GTO's and CP's...it is an older GTO2 mount with an upgraded CP4 chip. It really appears to me to be that somehow PHD2 (and ASIAir guiding - which borrows from PHD2) is sending somet

thanks for all the suggestions...sorry if I haven't been very clear and perhaps confounding ASIAir and PHD2.. I've tried both: guiding through ASIAir app and directly with PHD2 from my laptop which ha

No, I'm using a USB to RS232 serial converter cable (Keyspan is the make) that is plugged into the AP900 controller serial port. (I also tried the simple RS232-USB cable that came with the ASIAir...sa

Yes, found the Cal file - I've attached. The guide star is lost at the start of Cal, so Cal does not get completed. When using PHD2 for guiding, I have the mount connected directly to my PC via the RS

thanks Dean and Bryan.. - guide camera (ASI290 on a WOGS61 guide scope) is connected via USB to the ASIAir (or to my laptop when trying PHD2 directly) - mount is also connected to the ASIAir USB port

I tried using PHD2 natively to guide the AP900 and I get the same result: the AP900 is tracking fine until I initiate PHD2 calibration or guiding. Within 2-3 seconds of initiating PHD2, the tracking o

thanks Rolando...I'm going to have a closer look at the guide logs to see if that is what was happening. There does not appear to be a function in ASIAir to reverse the move commands as far as I know.

Hi, I recently purchased a used AP900 (Goto2 panel, with upgraded Goto4 handset chip) and have it up and running and linked to an ASIAir Pro. Everything is functioning well (Polar Align, Plate solving