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Re: PHD calibrated but not guiding GM8


Oct 27, 2013

 


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#53475 Oct 27, 2013

Dear All,

I've done a bit of research on this and can't find the answers anywhere, so I was hoping someone here can help.I have a Losmandy GM8 (non-Gemini) connected via GPUSB to my lappie. Lappie and mount communicate fine. Running PHD, the��software��goes through the usual motions during calibration and clearly sends commands to the mount and adjustments are made. However, once 'guiding', the program seems to let the star drift west and makes not adjustments at all? I've check the 'brain' and the min. pixel motion is set to 0.15. I've checked the N, S, E, W movements using the 'manual guide' option, to double check the the computer and mount are communicating through PHD. This works fine too. So why won't it guide?��

Any ideas out there?Cheers,

Stef



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#53477 Oct 27, 2013

Stef, since you are able to calibrate the guider, that means that Gemini is able to perform guiding commands. Gemini doesn't know whether you are calibrating or guiding (the commands are the same), so it should work the same for both if the commands are issued properly.��

Since calibration works but guiding doesn't, seems to point to some software configuration/setting issue, or possibly a wiring ��problem outside of Gemini. Try to look into PHD guiding log and see if there is something obvious there.

Regards,

��-Paul��

---In Losmandy_users@yahoogroups.com, losmandy_users@yahoogroups.com> wrote:



Dear All,

I've done a bit of research on this and can't find the answers anywhere, so I was hoping someone here can help.I have a Losmandy GM8 (non-Gemini) connected via GPUSB to my lappie. Lappie and mount communicate fine. Running PHD, the��software��goes through the usual motions during calibration and clearly sends commands to the mount and adjustments are made. However, once 'guiding', the program seems to let the star drift west and makes not adjustments at all? I've check the 'brain' and the min. pixel motion is set to 0.15. I've checked the N, S, E, W movements using the 'manual guide' option, to double check the the computer and mount are communicating through PHD. This works fine too. So why won't it guide?��

Any ideas out there?Cheers,

Stef



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#53478 Oct 27, 2013

Paul,

Stef mentioned non-Gemini.

Don

Verizon Wireless 4G LTE Galaxy S4



-------- Original message --------From: yh@... Date: 10/27/2013 10:23 AM (GMT-05:00) To: Losmandy_users@yahoogroups.com Subject: [Losmandy_users] RE: PHD calibrated but not guiding GM8

Stef, since you are able to calibrate the guider, that means that Gemini is able to perform guiding commands. Gemini doesn't know whether you are calibrating or guiding (the commands are the same), so it should work the same for both if the commands are issued properly.��

Since calibration works but guiding doesn't, seems to point to some software configuration/setting issue, or possibly a wiring ��problem outside of Gemini. Try to look into PHD guiding log and see if there is something obvious there.

Regards,

��-Paul��

---In Losmandy_users@yahoogroups.com, losmandy_users@yahoogroups.com> wrote:



Dear All,

I've done a bit of research on this and can't find the answers anywhere, so I was hoping someone here can help.I have a Losmandy GM8 (non-Gemini) connected via GPUSB to my lappie. Lappie and mount communicate fine. Running PHD, the��software��goes through the usual motionsduring calibration and clearly sends commands to the mount and adjustments are made. However, once 'guiding', the program seems to let the star drift west and makes not adjustments at all? I've check the 'brain' and the min. pixel motion is set to 0.15. I've checked the N, S, E, W movements using the 'manual guide' option, to double check the the computer and mount are communicating through PHD. This works fine too. So why won't it guide?��

Any ideas out there?Cheers,

Stef



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#53479 Oct 27, 2013

Oh, right - not Gemini. My answer still applies, though. If the mount responds to calibration commands, then it should also respond to guiding commands. If it doesn't then it's most likely the guiding software that's not working right. PHD log is still a good place to start.

Regards,

�� �� ��-Paul

---In Losmandy_users@yahoogroups.com, losmandy_users@yahoogroups.com> wrote:

Paul,

Stef mentioned non-Gemini.

Don

Verizon Wireless 4G LTE Galaxy S4



-------- Original message --------From: yh@... Date: 10/27/2013 10:23 AM (GMT-05:00) To: Losmandy_users@yahoogroups.com Subject: [Losmandy_users] RE: PHD calibrated but not guiding GM8

Stef, since you are able to calibrate the guider, that means that Gemini is able to perform guiding commands. Gemini doesn't know whether you are calibrating or guiding (the commands are the same), so it should work the same for both if the commands are issued properly.��

Since calibration works but guiding doesn't, seems to point to some software configuration/setting issue, or possibly a wiring ��problem outside of Gemini. Try to look into PHD guiding log and see if there is something obvious there.

Regards,

��-Paul��

---In Losmandy_users@yahoogroups.com, losmandy_users@yahoogroups.com> wrote:



Dear All,

I've done a bit of research on this and can't find the answers anywhere, so I was hoping someone here can help.I have a Losmandy GM8 (non-Gemini) connected via GPUSB to my lappie. Lappie and mount communicate fine. Running PHD, the��software��goes through the usual motionsduring calibration and clearly sends commands to the mount and adjustments are made. However, once 'guiding', the program seems to let the star drift west and makes not adjustments at all? I've check the 'brain' and the min. pixel motion is set to 0.15. I've checked the N, S, E, W movements using the 'manual guide' option, to double check the the computer and mount are communicating through PHD. This works fine too. So why won't it guide?��

Any ideas out there?Cheers,

Stef







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#53480 Oct 27, 2013

The most common causes are: ��1.������������ Hot pixel you might be guiding on a hot pixel2.������������ Connector is not making good connection from the AG to the mount.3.������������ Minimum move is set to high.Aubrey ��From: Losmandy_users@yahoogroups.com [mailto:Losmandy_users@yahoogroups.com] On Behalf Of stefrum1974@...Sent: Sunday, October 27, 2013 6:48 AMTo: Losmandy_users@yahoogroups.comSubject: [Losmandy_users] PHD calibrated but not guiding GM8



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#53481 Oct 28, 2013

Stef,

The is a setting in PHD guiding which calibrates but does not guide.

You will find it under the .brain. at bottom left - disable guide output.

I spent a night manually guiding because of this - I must have accidentally changed the setting.

Regards

PaulOn 27 Oct 2013, at 10:47 pm, stefrum1974@...> stefrum1974@...> wrote:

Dear All,

I've done a bit of research on this and can't find the answers anywhere, so I was hoping someone here can help.I have a Losmandy GM8 (non-Gemini) connected via GPUSB to my lappie. Lappie and mount communicate fine. Running PHD, the��software��goes through the usual motions during calibration and clearly sends commands to the mount and adjustments are made. However, once 'guiding', the program seems to let the star drift west and makes not adjustments at all? I've check the 'brain' and the min. pixel motion is set to 0.15. I've checked the N, S, E, W movements using the 'manual guide' option, to double check the the computer and mount are communicating through PHD. This works fine too. So why won't it guide?��

Any ideas out there?Cheers,

Stef



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#53482 Oct 28, 2013

To get intelligent help, post your settings (esp. RA Aggressivness and RA Max Motion) along with a sample Log. ��It is unlikely you are guiding on a hot-pixel, since otherwise you should see no motionwhen using the Manual Guide tool or during Calibration. I use the GPUSB on my G-11 and it works 100%, as does PhD. Since calibration runs you must be selecting GPUSB as your Mount option and you must be connecting to both the Camera and the Mount before Looping to select the cal/guide star. You should, however, always recalibrate when moving the direction (esp. DEC) of the telescope). Calibration is so easy in PhD and it is quick (compared to how long we image) so there is no reason not to do it. ��However, I have seen PhD do a very strange thing, so on the off-chance that you are seeing the same thing I will ask��� ��Is it drifting west or really moving out? I ask because once with my DSI guider I saw, as a function of camera orientation, that the calibration would complete but then the RA commands (you are watching the bottom of the PHD window to see what it thinks it is doing, right?) were in the wrong direction until I used the Flip Calibration Data. It literally drove the guide star out of the track box. The messages in the bottom of the PhD window kept reporting bigger and bigger RA motion as the star marched merrily out of the track box. I stopped it, checked the Force Calibration box, and restarted calibration/guiding. Did the same thing. No, I didn���t change the physical camera orientation between the cal and the guiding. That would be dumb. Yes, I expect somebody to chime in saying it can���t happen. But it did: Somehow it calibrated in both RA and DEC but then the guide commands were in the wrong (for RA only) direction: 180 off. Using Flip Cal fixed it, as did rotating the camera 90 degrees and recalibrating. ��Strange but true. But then you have to wonder why the Flip Cal command is there, right? ��Mark Christensen



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#53483 Oct 29, 2013

I've been caught out by the 'disable guider output' checkbox in the brain menu. That produces exactly the behavior you describe. also - I don't think PHD will calibrate on a hot pixel.

Good luck.

Andrew.



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#53624 Dec 8, 2013

Dear All,

Thanks for all the responses. For some reason they didn't show in my 'inbox'.I managed to get PHD working a treat, by just changing the settings and only correcting dec in 'North'. It's been working fine for the last couple of weeks. However, last night it was back to it's old tricks.I noticed the scope was not balanced right in dec, so I 'fixed' it. Unfortunately, PHD is very unhappy about this. Watching the the graph, Dec slope is steep and going downwards, RA slope seems to be following it? I checked that the drives were working by using my manual control pad (these were fine).I checked the 'brain'. Guide commands were being sent - I hadn't accidentally checked the 'disable guide output' box.Settings: mx RA And Dec at 500. RA agr 100. RA hys at 10. Mn mo 0.15. North. Calib step at 800.

I fiddled with max dec and RA during the night. Upped them to 2000, each at one stage. No improvement.��Should I 'unfix' my dec balancing?Cheers,

Stef

---In losmandy_users@yahoogroups.com, alocky@...> wrote:

I've been caught out by the 'disable guider output' checkbox in the brain menu. That produces exactly the behavior you describe. also - I don't think PHD will calibrate on a hot pixel.

Good luck.

Andrew.



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#53627 Dec 10, 2013

For DEC use Resist Switch. North or South only guide in one direction, so if your error is in the other, your stuck.



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