Chris Rowland replied to the topic 'Ekos Celestron mount pointing error' in the forum. 2 weeks ago

The error message tells you exactly what is wrong. The mount is not aligned. You have to do some sort of alignment using the HC. The alignment gives the mount the information it need to be able to get and set the position.
A quick align is enough, then a solve and sync will refine the position locally. DO NOT do this close to the pole.

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Chris Rowland replied to the topic 'Polar alignment non-goto mount' in the forum. 2 weeks ago

The current three image PA method in Ekos doesn't need critical movement of the mount, just that the movement is large enough that there is a signficant change to the images. Any movement over about 15 degrees should be enough. There must be no movement of the dec axis, that's not difficult to achieve.

The only one goto, one shot polar alignment I know of is Celestron's ASPA and this uses the previously done mount alignment to get the polar alignment error.

The nature of drift alignment means that it can only see the error in one direction so it hs to be done in two positions.

Part of the problem with polar alignment is that people are too fussy. A small amount of PA error can be guided out and may help because the declination corrections are all in the same direction. What is left is field rotation and if you do the sums this will be insignificant.

A PA error of less than 10 arc minutes should be fine. If you have a permament mount then it may be worth the effort to get closer but even then less than an arc minute won't achieve anything useful.

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Chris Rowland replied to the topic 'Polar alignment non-goto mount' in the forum. 2 weeks ago

Ekos already has two PA tools, one of which is at least similar to the drift method that PHD2 uses.

I don't understand this desire to put everything in one big bucket, the whole point of modern multitasking operating systems is to be able to use multiple things at the same time.

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Chris Rowland replied to the topic 'Progressive "Refocus every" in EKOS' in the forum. 2 weeks ago

Avarakin, you will be far better implementing this rather complex algorithm yourself, that way you will get what you want - or at least be more likely to.

But starting the cool down process a bit earlier may be as effective, maybe this could require little more than a change in the order in which you set thigs up.

Or if you have an observtory do what the professionals do - air condition the observatory to the predicted night time temperature :)

Would an alternative way to determine the interval between refocuses be to look at the amount of change made? For example if it's changed by 100 in 10 minutes you do the next refocus in 10 minutes, it it's only changed by 10 you wait, say 30 minutes.

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Chris Rowland replied to the topic 'PPEC and EQMod crashing and general strangeness' in the forum. 3 weeks ago

I don't think it is fair of you to blame the equipment manufacturers because you are not using their published interface, you are using an internal interface that they only intend to be used for communication with their hand control.

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Chris Rowland replied to the topic 'Re:Figuring out a meridian flip?' in the forum. 3 weeks ago

The mount must not spontaneously do a flip by itself. It must be passive, and allow Ekos to attempt the flip when Ekos thinks it is time. The mount can have an hour angle tracking limit that will stop tracking if the mount has not flipped. That limit needs to be sufficiently past the meridian that there is time for the flip to be attempted.

Exactly where the mount flips is up to it and as Jo found if the time settings are wrong the mount may flip later or earlier than expected. Indi/Ekos doesn't seem to handle DST well so you may have to leave DST set to zero and adjust the time zone to compensate.

One way to tell is to do a quick align, then slew to somewhere clear of the pole and do a solve. If the solved position is a long way out in Ra then you probably have a time problem. The sync may correct for this but no changes the mount position where the flip is done.

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Chris Rowland replied to the topic 'Meridian flip - is there a limit?' in the forum. 3 weeks ago

It depends.

The later versions of Ekos have an hour angle limit which you can set to something sensible. Then, Iff your mount reports pier side reliably, Ekos will monitr pier side and hour angle and if the flip fails Ekos will be able to tell and will stop tracking when the Ha limit is exceeded with the mount in the wrong pointing state.

But this depends on the mount reporting pier side correctly. It is doesn't then no checks can be made.

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Chris Rowland replied to the topic 'Re:Newbie need advise on buying his 1st GEM' in the forum. 3 weeks ago

I haven't given up my AVX, it's the mount I use most.

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Chris Rowland replied to the topic 'Re:Newbie need advise on buying his 1st GEM' in the forum. 3 weeks ago

mhammady wrote:

ChrisRowland wrote: I've had an AVX for many years and I think it's an excellent mount. It certainy carries 10 kg for imaging.


Thank you Chris. Do you have any issues with AVX with Ecos/Indi use?


No. If there were problems I would fix them.

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Chris Rowland replied to the topic 'Newbie need advise on buying his 1st GEM' in the forum. 3 weeks ago

I've had an AVX for many years and I think it's an excellent mount. It certainy carries 10 kg for imaging.

Jo's point about having a set up that is quick and easy to set up - and more importantly close down in a hurry - is a good one, and the AVX does it for me. I've got two 80mm scopes mounted side by side with a Raspi 3 driving an Atik 383L+, an ASI 1120mm guide camera, a Moonlite focuser and a quantum filter wheel. The mount is controlled using a separate Pi zero. Everything is connected wirelesly and I'm using 12V to 5V adaptors so the whole lot is driven by one 12V supply. I can carry it out and set it up in 5 minutes and get it in in two.

One thing about the Celestron mounts is that the alignment and control is mature and just works.

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