Gene, Yes, it seems to be OK! I got a pretty good image of M43 last night and M77 was steady enough to show my son. He was disappointed that he couldn’t see the neutrino flux (just kidding). I misspoke about the clutch. If there is one if must be integrated into the motor assembly. I was just experimenting with the CCD simulator and the guiding simulator. The pointing error is around 30 arcsec with no bias in either axis and the guiding is within 2 arcsec.

I do not observe a conflict between the Nexstar+HC when run in parallel with the wifi dongle (each one plugged into an aux port in an aux port splitter). This is nice because it’s convenient to have the HC for initial positioning and for polar alignment.

I’m looking forward to the next clear night! Thanks for checking in.

Mike

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I able to attach the pinion by tapping a new set screw hole. So my mount is reassembled and seems no worse for wear. I took the opportunity to clean and relube both the RA and DEC drives. The gears all look in fine shape, no excessive wear. No new mount just yet!
Mike

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Gene,
The set screw on the pinion gear for the AZ/RA drive no longer fits the hole and the epoxy holding the gear in fractured allowing the pinion to slip. One two many stalls of the motor I guess. Celestron does not appear to sell these gears separately. The pinion for the ALT/DEC drive seems to be identical and the motor assembly with the gear is available. Note sure I want to pay $159 for a gear that may not come off without damage. Any ideas on sourcing of the pinion? Or are the astronomy gods telling me to buy a new mount?
Mike

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That was a very informative evening. The Celestron Wifi wedge AUX driver performed quite well when the Nexstar+HC was removed and control was done just using the SkyPortal Wifi module. The system was stable and the RA and Dec errors while still on the large side were as low as 160 arcsec for a while. That is until my AZ clutch failed! I conclude I had two issues, the AUX driver is incompatible with the HC and I had a failing clutch and/or gearbox. Now I get to take it apart and see what the damage is. The mount is 16 years old.
Mike

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I believe I have tried it both ways. Sync, then GOTO, Plate solve then GOTO. And no plate solve nor sync, then GOTO. The result seems to be the same. I tried with the Wifi dongle alone inside today, and at least this is stable, no wandering off. I'm about to take my mount outside.
Mike

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Gene,
It never gets close. My recollection is that it is declination that has the very large error (the first number in the table of results from alignment). RA is off too, but not as large an error, about two orders of magnitude worse in declination. I have no backlash compensation on, just letting PHD2 handle that.
Mike

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One more time, I tried Celestron AUX through the NexStar + HC in a real situation tonight and got the same result that I have been getting since the beginning. The capture and solve with slew to target is never able to converge on the target. The program just endlessly tries to move the mount to the target and fails. I will try the Skyportal wifi module to see if the HC is causing a conflict.
Mike

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Michael Moir replied to the topic 'Weird pointing problem' in the forum. 7 days ago

Another clear moonless night here with nothing to show for it. I tried the SS HC set up that worked with Stellarmate 1.7.2 (during DST) but even after ensuring that DST is turned off, the pointing issue persists with 1.7.3. After quick align, Kstars and the mount agree on the position, but after a move, the scope appears to start to move in the right direction, but then abruptly wanders off. Is there something that was changed in 1.7.3 other than the introduction of a new way of inputting optical trains? What is it that I am missing? Is there something with slew limits perhaps?
Mike

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Thanks, Gene! I really appreciate you looking at this and getting to the bottom of the problem, or in this case a non-problem. Now I can continue with confidence.
Mike

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Gene,Is
I notice in my log file that the errors occur before the location data is read. Is what we are seeing some sort of negotiation between the driver and the mount to ensure that each knows that the mount is a wedge? And the errors are an indicator that the orientation is not ALT-AZ?
Mike

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Gene,
Attached is the log file for just the mount, the HC, a CCD simulator, and Astrometry. Looks like the error messages are the same. Well at least the PPBA isn't causing the problem!

File Attachment:

File Name: log_23-33-48.txt
File Size: 144 KB


I do have the necessary hardware to build a direct PC interface so I think that will be my next step and rid myself of the HC altogether. Is it possible to have the direct interface and the HC in parallel through another AUX port or am I asking for trouble?
Mike

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Gene,
Thanks for looking at this. I am connected through the USB port on the Nexstar + HC. I will do as you suggest and simplify to the CCD simulator and the mount. I'll take the PPBA out of the picture which is where the two cameras and the focuser are connected. The mount is connected separately to the RPi. I couldn't get the mount to connect when plugged into the PPBA.
Mike

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Gene,
Sorry, here's the logfile with everything checked. I stopped the logging after a while

File Attachment:

File Name: log_20-28-13.txt
File Size: 509 KB
since it was continuing to log the current position.
Mike

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Gene,
The two error messages from the AUX driver are near the bottom of the file.
Mike

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