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Guider calibration is wrong after meridian flip

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Max,

I'm glad you figured out at least a workaround for your issue.
What do you mean by "rotated the saddle"? Can you add a picture?
Do you literally mean that just the piece of metal that clamps the OTA onto the mount was rotated,
but the mount itself and OTA itself are in the same position (not rotated)?

Also, why did you "rotate the saddle"?

Hy
2 years 11 months ago #71255

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Yes, "the piece of metal that clamps the OTA onto the mount was rotated".
I did this because on HEQ5, one needs to rotate the OTA 90 degrees to horizontal position to be able to use the polar scope, otherwise it's blocked.
I rotated the saddle so that I could use the polar scope when the OTA was pointing to the NCP.
It's just the mechanics. I rotated the saddle and rotated the mount's axis back so that the scope was still facing the NCP.

Of course, now I don't use the polar scope (but I did before).
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
2 years 11 months ago #71259

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Oddly, this just happened to me last night on a CEM120 EC2 mount.
Everything was great before the automated flip.  Then the guider couldn't calibrate because the RA was going in reverse.
I stopped it - and performed a manual calibration and then it worked.  It seemed that when EKOS did the automated calibration, that was when the problem occurred.

Peter

 
Last edit: 2 years 10 months ago by Peter Kennett.
2 years 10 months ago #72124

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It's still doing it to me.
Most of the time. Only on a rare occasion it doesn't.

Tonight I did two flips to test.
One - over north meridian. One - over south meridian.
Both calibrations failed immediately after the flip but were OK on the second attempt.

Let me illustrate.

Before the flip:
 
After the flip:

After the flip. Second attempt:
 
 
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
Last edit: 2 years 7 months ago by maxthebuilder.
2 years 7 months ago #75411
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Can you verify that this doesn’t happen with PhD2, and thus isn’t some issue with the mount?
If you do find out that it may be a software issue, please also send a log where you have at least debug logging for guide, mount, and mount driver.
2 years 7 months ago #75429

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Hy...

My test last night using build from master on Friday Morning does the same thing - I am OnStep mount and have been calibrating normally for long time until new beta - I have a 2 fail / 1 succeed pattern - then I increased the pulse from 1000 to 1500 which did seem to help - calibration AFTER my flip took only 1 try!
Attached logs - hope they help - you can also see from shot here the pattern and some random take-off in DEC that I think I was able to slay by reducing the max arc-sec in guide options - was playing with aggressiveness around .65->.70 which seems good
The good news here is despite some wierd excursions, some declining SNR, the system was able to correct and keep going - those excursions however are worrisome as the moved the target in the frame by a large amount - I would expect guide to cease motion on huge jumps but it looks like it was being driven (see screen shot)
Hy...

My test last night using build from master on Friday Morning does the same thing - I am OnStep mount and have been calibrating normally for long time until new beta - I have a 2 fail / 1 succeed pattern - then I increased the pulse from 1000 to 1500 which did seem to help - calibration AFTER my flip took only 1 try!
Attached logs - hope they help - you can also see from shot here the pattern and some random take-off in DEC that I think I was able to slay by reducing the max arc-sec in guide options - was playing with aggressiveness around .65->.70 which seems good
The good news here is despite some wierd excursions, some declining SNR, the system was able to correct and keep going - those excursions however are worrisome as the moved the target in the frame by a large amount - I would expect guide to cease motion on huge jumps but it looks like it was being driven (see screen shot)
Summary:
No crashes - good
End to end scheduler operation - good
focus at each filter in schedule - good
Align - fine on both sides of flip
Flip - no problems and all other operations in sync
Guide - valiant effort to guide in crappy conditions - good
Guide Calibration  - took multiple tries 2 out of 3 times despite being at same spot in the sky that was successful a short time ago
Guide DEC excursions - if guide start is out of zone or cant be found I was thinking the capture and other operation would abort but that is not the case and (lucky for this thread) I have the captured image of the "move"
    

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2 years 7 months ago #75433
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I'll reply here just for the sake of saying that I've experienced this type of issue as well, although it hasn't happened during meridian flips but just during normal calibration in the beginning of a session.
2 years 7 months ago #75439

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Jamie,

I hope things are working well. I dont actually see any DEC excursions in the log segment you included, but it looks like the part of the log you included is at 11pm local time, and your image with the star trail is at 3:30am. For future posts with logs, please send the whole log. If you think the file is too big, then please upload it to google drive or something like that and send a link. It's good to be able to see what software is running and other related things and to compare problematic sections with sections where things are working well.

Hy

 
2 years 7 months ago #75587

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OK.
I tried it with PHD2 - worked fine without any issues.

Tried with the Internal Guider set to reuse the calibration - didn't work.
This time the first frame after the flip wouldn't acquire with a timeout.
After stopping and restarting - all was well.

So it all boils down to the first frame after the meridian flip.
For some reason it's somehow wrong with the Internal Guider.

Very annoying but strangely, not many people complaining
I am pretty sure it worked fine a year ago.

Thanks!
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
The following user(s) said Thank You: Simon
2 years 7 months ago #75644

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Here I go again...
Updated/upgraded to latest Stellarmate/KStars/Ekos.
First try - the flip went well!
Second try - same problem - guider went in the wrong/opposite direction while calibrating. After stop/start - all is well.

So, it works but cannot be done unattended.
Really upsetting.
It did work fine a year ago.
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
2 years 6 months ago #76678

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This only happens when reusing calibration?
2 years 6 months ago #76679

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I upgraded a couple of days ago to the latest SM and KStars - same problem.
Last night I clicked on Purge All in EQMod and after that the meridian flip worked fine!
Don't know why I didn't do this before and also I don't know why it helped.
I hope it will work right from now on.
: )
-- Max S
ZWO AM5. RST-135. AZ-GTI. HEQ5. iOptron SkyTracker.
TPO RC6. FRA400. Rokinon 135 and other lenses.
ZWO ASI2600MC. D5500 modified with UVIR clip-in filter.
ZWO ASI120MM Mini x 2. ZWO 30F4 guider. Orion 50mm guider.
ZWO EAF x 3.
2 years 2 months ago #79879

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