G11 Gemini 2 and Starshoot Autoguider
Posted 26 December 2012 - 04:28 PM
I finally got a chance to take out my new G11 with Gemini 2 for imaging last night, even though the moon was near full. The goto was working well, in fact everything worked well except one thing. I could not get the mount to work with my Starshoot Autoguider and Phd Guiding. I was wondering if anyone has had trouble guiding with your SSAG and G11 mount?
I plugged everything in right, and double checked everything. My polar alignment was pretty good, but not perfect. There was a slight drift in declination and it was not being corrected. When using the SSAG with my CG5 mount, I'd often get quite a drift in declination, and the autoguider had no problem correcting for this and a rather poor polar alignment.
What am I doing wrong? The G11 is a great mount but I need it to be working with my autoguider...
Thanks in advance for any advice anyone can provide.
Posted 26 December 2012 - 07:25 PM
I used a G11 Gemini II and SSAG/PHD for several months with no problem.
1/Is the Gemini II FW reasonably up to date? By this I mean only that it is not one of the very earliest versions?
2/Is Gemini II in Photo or All Speeds mode? (Find this under the Functions page).
3/Does PHD attempt to calibrate?
4/Does it successfully calibrate and how many iterations (approximately) does it take in each direction to do so?
Posted 26 December 2012 - 08:08 PM
1)Gemini II firmware was updated a few weeks ago.
2) Gemini II was in all speeds mode, then I switched to photo mode but didn't reboot. It wasn't guiding in Dec after switching to photo mode, but maybe it needed a reboot.
3)PHD did calibrate.
4)Calibration seems to be successful, but the process doesn't look like the cg5 calibration. PHD doesn't seem to move the mount much...
I will try again on a clear night. I spent a few hours trying different things but nothing worked. I hope it's nothing with the hardware. I'm hoping it's PHD. Maybe the max DEC duration is too low? I currently have it set to 150ms.
Posted 27 December 2012 - 01:42 PM
of course for me at 150ms it will not even calibrate so perhaps this is not your problem.
Posted 30 December 2012 - 11:21 PM
Posted 31 December 2012 - 07:51 AM
I would reload PHD and use the default values..
make sure you check on guider.. (you are using the 4 pin
guider cable from guider to G2)
You can also go to the web interface and look at the guider
pulses.....my rms values are about .14 avg.
Posted 31 December 2012 - 11:06 AM
Posted 03 January 2013 - 05:07 PM
Most times a reboot is at hand if everything stops. Auto guiding is OFF in Gemini visual mode, set it to photo.
In PHD set max RA duration to 750 - 1000. And calibration step to 750. I have my aggressiveness set to 68. Also, always calibrate on a new subject.
Posted 05 January 2013 - 10:06 PM
as far as i know there's no real workaround. if max dec in PhD is set too low then even when your guidestar moves too far away, PhD may never send a long enough dec pulse for it to be seen.
Posted 06 January 2013 - 02:09 PM