John Hoogerdijk replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 6 days ago

Greg,

Thanks for chiming in. I read through your posts and am a little more puzzled. I have no diagonals in my setup. The image parity is negative, but parity or orientation shouldn't matter. One possibility is that the software makes an assumption of what hemisphere I'm in - I'm north, but if the software assumes south, then the difference in vector direction makes sense.

jmh

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I purchased a cheap USB GPS dongle off of Ebay - I think your best bet is a Ublox chip. If you google Ublox and gpsd, you'll find the approrpate version of the chip that works best. Mine doesn't have the high precision PPS time bits, but it works well. Check out gpsd and take a look at the link below:

www.ebay.ca/itm/GPS-Receiver-Module-Ante...tem4d6dbd329c&_uhb=1

I have this attached to my Raspberry PI 3B+. Use the auxiliary GPSD indi device and you're good to go.

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John Hoogerdijk replied to the topic 'INDI and IEQ CEM60' in the forum. 7 days ago

Thanks! I appreciate the quick turnaround.

jmh

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John Hoogerdijk replied to the topic 'INDI and IEQ CEM60' in the forum. 1 week ago

Hope someone can confirm the answer regarding getting time and location from the GPS in CEM60 mounts - as in the previous post, do the instructions on the IEQ mount page mean a physical connection, ie: insert the cable and turn on the mount, or does it mean the Connect button in the INDI panel? The only way I could get the site management tab location populated was to turn off the mount remove the cable, turn on the mount and insert the cable. Let me know if I'm missing something obvious...

Thanks.

jmh

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John Hoogerdijk replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 1 week ago

Thanks for your efforts on this. I did the reverse movement using the vector provided and I think I have success at 22arcsecs off NCP - take a look at the attached screen capture. But, I no longer see Polaris in my polar scope, so either it is way out, or something else is going on. As I type this, I am running the Guiding Assistant in PHD@ - I'll get it run for 20min or so and see what it computes as the Polar Align error - it probably will be a bit more as I'm doing this in a wind between 25 and 35 kph. At least its dark...

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John Hoogerdijk created a new topic ' INDI and IEQ CEM60' in the forum. 1 week ago

Hi,

I am completely bewildered by INDI Configuration and the INDI Control panel.

I have an CEM60 and the driver is the IEQ Telescope driver. I can connect to the mount, and in the INDI control panel under the IEQ section, I see a number of tabs and things that make sense, more or less, and I don't know if I have the correct expectations:

Under the documentation for the IEQ driver, it says: "On connection, the mount retrieves the controller time and location and updates the client accordingly". Now, the CEM60 has an internal GPS which I would like to use for Time and Location. So, going to the Configure KStars under the Settings tab, and then going to the INDI Configuration panel, I have chosen the "Mount updates Kstars" option. I've enabled debug and set verbosity, and looked through indi and ekos logs, but I see no evidence. I can see command that query RA and DEC, but nothing that refers to location and/or time.

From the driver documentation under Devices on the INDI website we have a statement that says "the mount retrieves the controller time and location, and updates the client accordingly ..." This, and the text that says "Mount updates Kstars" tells me that the mount actually sends the update, and Kstars is waiting for it somehow. Does it do this periodically or just once? Or does Kstars query the mount? I can see the time and location on the hand controller, but I don't know where to look in Kstars. My indserver is running on an RPi3B+ in my obs, and it all seems to work, so I don't think that's an issue. When I check the Geographic Tab under Settings in Kstars, nothing is set. When I check the Site Management tab under the IEQ mount, LAT and LONG are set to 0 (and I'm not at zero lat and long ...) Where the driver documentation refers to client, does it mean INDI, or Kstars, or EKOS?

If the mount indeed is updating Kstars, shouldn't the site management tab be updated automatically?

Looking for answers and help!

TIA,

jmh

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John Hoogerdijk replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 1 week ago

I'm running 2.9.6 bleeding, specifically

kstars-bleeding/xenial,now 6:2.9.6+201805251429~ubuntu16.04.1 amd64 [installed]

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John Hoogerdijk replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 1 week ago

There was intermittent clouds tonight, but I decided to follow the process as per the instructions, collect the logs, and do screen captures so you can all see what I've done.

Here are the align module logs:

[2018-07-05T22:57:53.294 CDT DEBG ][ org.kde.kstars.ekos.align] - P1 RA: "02h 31m 33s" DE: " 89° 15' 50\""
[2018-07-05T22:57:53.294 CDT DEBG ][ org.kde.kstars.ekos.align] - P2 RA: "00h 38m 24s" DE: " 89° 13' 55\""
[2018-07-05T22:57:53.294 CDT DEBG ][ org.kde.kstars.ekos.align] - P3 RA: "22h 48m 24s" DE: " 89° 13' 14\""
[2018-07-05T22:57:53.294 CDT DEBG ][ org.kde.kstars.ekos.align] - P1 X: 119.525 Y: -48.4096
[2018-07-05T22:57:53.295 CDT DEBG ][ org.kde.kstars.ekos.align] - P2 X: 412.35 Y: 405.71
[2018-07-05T22:57:53.295 CDT DEBG ][ org.kde.kstars.ekos.align] - P3 X: 896 Y: 643.5
[2018-07-05T22:57:53.348 CDT DEBG ][ org.kde.kstars.ekos.align] - RA Axis Circle X: 1083.44 Y: -348.489 Radius: 1009.54
[2018-07-05T22:57:53.348 CDT DEBG ][ org.kde.kstars.ekos.align] - RA Axis Location RA: "22h 48m 49s" DE: " 89° 54' 35\""
[2018-07-05T22:57:53.348 CDT DEBG ][ org.kde.kstars.ekos.align] - RA Axis Offset: " 0° 05' 24\""



[2018-07-05T23:21:39.264 CDT DEBG ][ org.kde.kstars.ekos.align] - P1 RA: "02h 32m 11s" DE: " 89° 15' 44\""
[2018-07-05T23:21:39.264 CDT DEBG ][ org.kde.kstars.ekos.align] - P2 RA: "00h 52m 35s" DE: " 89° 12' 32\""
[2018-07-05T23:21:39.264 CDT DEBG ][ org.kde.kstars.ekos.align] - P3 RA: "23h 16m 30s" DE: " 89° 11' 42\""
[2018-07-05T23:21:39.264 CDT DEBG ][ org.kde.kstars.ekos.align] - P1 X: 181.254 Y: 33.2729
[2018-07-05T23:21:39.264 CDT DEBG ][ org.kde.kstars.ekos.align] - P2 X: 454.614 Y: 438.198
[2018-07-05T23:21:39.264 CDT DEBG ][ org.kde.kstars.ekos.align] - P3 X: 896 Y: 643.5
[2018-07-05T23:21:39.322 CDT DEBG ][ org.kde.kstars.ekos.align] - RA Axis Circle X: 1045.77 Y: -255.614 Radius: 911.502
[2018-07-05T23:21:39.322 CDT DEBG ][ org.kde.kstars.ekos.align] - RA Axis Location RA: "23h 31m 25s" DE: " 89° 49' 00\""
[2018-07-05T23:21:39.322 CDT DEBG ][ org.kde.kstars.ekos.align] - RA Axis Offset: " 0° 10' 59\""

And these indeed show that the alignment is worse. The attached zip contains the images that shows what I did. There was a couple of Capture and Slew to target steps that I didn't bother to capture - I wanted to start the second attempt from as close to the same position as the first attempt.

The cloud rolled in again, so I couldn't do the reverse process. The forecast is clear for tomorrow night, so I'll do that tomorrow night. But in the meantime, have a look and let me know if I'm doing the right things.

jmh

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John Hoogerdijk replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 1 week ago

Thanks for your comments, and no need to apologize for trying to help a fellow imager. I've been imaging for about 7 years, give or take, but the CEM60 is new to me, as is KSTARS/INDI/EKOS, so there is a learning curve. Using my Polar scope, I can get to about 5 to 8 arcmin of NCP, and will work reasonably well at my current focal length of 900mm, but I want a crack at imaging with my C11 @ 2800mm with exposures on the order of 10min or so. I know I'll have problems with mirror shift, but if I can get really close to NCP, that will help to limit rotation I see at long focal lengths.

It might be helpful for folks to know I am not using a tripod - my mount is on concrete pier sunk about 15 feet down, so its stable. (There's a story behind this, but where I live, the frost depth can hit 8ft, so you need to have sufficient depth to counteract frost heaves.)

I'm really happy with the CEM60 adjustments for Alt/Az - not as good as a really high-end mount I suppose, but it's a big step compared to my old CGEM. I am scratching my head with the Polar alignment module - when I set the vector tip on a star, I'm able to move the star to the crosshairs and hit the middle ease, but when I repeat the exercise to check my alignment, the result is far worse than when I started.

Stay tuned - I'll have another crack at this in another hour, provided the clouds stay away...

jmh

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John Hoogerdijk replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 1 week ago

Exactly what I was planning.

jmh

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John Hoogerdijk replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 1 week ago

I should have taken screen shots of the Alignment windows as i went - I'll try that tonight as I think it will illustrate what I think might be happening, And I do use the Alt/Az knobs, not the controller. (I know you have to ask ... ;-)

My first attempt resulted in a polar alignment error of 33arcmin. When I made the correction, and start the second attempt, the reported error was about 55arcmin. I never bothered trying to move the move on the second try and went back to using the polar scope that comes with the CEM60. My polar scope is slightly misaligned, but the interesting thing is that all of the mount movements required to get Polaris where it needed to be on my polar scope were exactly the opposite of what the Polar alignment module wanted me to do.

After I used the Polar scope, I went back to the alignment module, and it reported the Polar alignment error to be 5arcmin. This is where I should have taken a screenshot, because I could clearly see NCP, the circle of rotation for the current mount position, and the vector - the direction of the vector was suggesting I move the circle of rotation away from the NCP position, not towards it. Could it be that the direction is flipped somehow? Anyway, the clouds moved in, so I couldn't test it. I'll try again tonight and take screenshots as a go through the process.

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John Hoogerdijk replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 1 week ago

See attached log file.

Thanks,

jmh

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John Hoogerdijk replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 2 weeks ago

Thanks for your response. Everything was rigid and tightened down.

I've attached the log file. Interesting bits start about 22:30.

FOV was about 72 x 51 arcmin.

jmh

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John Hoogerdijk created a new topic ' Polar alignment module and CEM60 geometry' in the forum. 2 weeks ago

Hi all,

I am attempting to polar align my CEM60, and the alignment is getting worse after two iterations - I was within 30 arcmin after the first attempt, and 34arcmin after the second attempt.

I'm wondering if the geometry of the CEM60 is suiable for the polar alignment module? It is more or less a GEM, but perhaps there is something I'm missing.

Any pointers are appreciated?

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John Hoogerdijk created a new topic ' Polar alignment module and CEM60 geometry' in the forum. 2 weeks ago

I am attempting to polar align my CEM60 using the polar alignment module. After the first attempt, I was 30 arcmin off, and after the second attemp, 34 arcmin off.

Is there something about the CEM60 geometry that doesn't work with the polar module?

Any and all pointers appreciated!

jmh

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