Wim van Berlo replied to the topic 'subpixel accuracy - autoguiding' in the forum. 6 days ago

If you set the correct FL and pixel size in your guider software, guiding error will be displayed in arcsevonds. Otherwise it will be displayed as pixels.
I'm not aware of any books, specific on guiding. Two general books on astrophotography are
Making Every Photon Count, by Steve Richards, and
Long Exposure Astrophotography, by Allan Hall.
A good online resource is Craig Stark's website:
www.stark-labs.com/craig/articles/articles.html
Stark is the original developer of PHD guiding software.
As for best guiding fl, a general rule of thumb is that the guiding pixel scale shouldn't be more than about 2 times the imaging pixel scale. In practice, if your guiding is too coarse, you can't get good pictures, while if it's too fine, you'll be guiding the noise.
Hope this helps.

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Wim van Berlo replied to the topic 'subpixel accuracy - autoguiding' in the forum. 6 days ago

You can't set it. It's a result. The guide camera images a star. The guiding software then calculates a star profile (centroid) from the pixel data. The software then calculates where to move the mount, such that the peak of the calculated profile stays at the same position. In theory, the movements may be smaller than one pixel. If the software can kerp the guidong error below one pixel of the guide camera, you have subpixel accuracy.

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Wim van Berlo replied to the topic 'keyboard messed up in Ekos/Kstars on Rock64' in the forum. 3 months ago

No worry about the side thread, Maudy.
I run arm64. The system works fine with indi, and kstars on windows. It's just that if I run kstars on the Rock, that I have this problem. The keyboard works when I run xrdp with cnv4server and windows remote desktop. But the app screens in ekos freezes. This otoh works fine with xrdp and tightvncserver. But then the keyboard in the kstar's find dialog and ekos configuration manager don't work (q becomes c, etc). The keyboard works fine in libre office and terminal.
For now, I'll continue using indi headless on the Rock.

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Wim van Berlo replied to the topic 'Abort current exposure when hour angle is greater than 0' in the forum. 3 months ago

I see two problems with your suggestion:
The client could abort a 1 hour exposure even when only a few seconds are left. Discard or keep that exposure? Then what about a few minutes left? What decides?
In your edit, what if the exposure is again one hour, and the flip will occur just before that hour has passed? Should the sequence be halted for almost an hour? That seems precious imaging time lost. It would be easier to force an early flip or a late flip.
Personally I would calculate where in the sequence a flip needs to occur, and insert a forced flip there, between exposures. With one hour exposures, the flip is then no more than half an hour early or late. I think that most setups allow for this margin before the scope hits the pier.

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Wim van Berlo replied to the topic 'ASI CCD cannot connect if EqMod driver not chosen' in the forum. 3 months ago

Have you tried leaving the mount out altogether? When I shoot darks, I just connect to the ccd and the fw (although I don't really need that). Worked fine last time I imaged (April).

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Wim van Berlo replied to the topic 'keyboard messed up in Ekos/Kstars on Rock64' in the forum. 3 months ago

Note to self:
I uninstalled all vncservers I could find, as well as xrdp
Then reinstalled xrdp and vnc4server (one of the recommended support packages). This had the following effect
- the keyboard problem in kstars was solved
- starting ekos with simulators froze the ekos screen after it had started an instance of indi. There may have been a message window behind the ekos window that caused this. i could drag windows across the desktop, but they were just not responsive when clicked in.

Uninstalled vnc4server and xrdp and reinstalled xrdp
Installed tightvncserver. The keyboard problem was back, but kstars and ekos worked flawlessly, no unresponsive windows.

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Wim van Berlo replied to the topic 'keyboard messed up in Ekos/Kstars on Rock64' in the forum. 3 months ago

Thanks again.
Of course I run my machine headless, so there is no session to view. Fortunately the first link you provided contains information regarding this.

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Wim van Berlo replied to the topic 'keyboard messed up in Ekos/Kstars on Rock64' in the forum. 3 months ago

I downloaded this and the tightvnc viewer for windows. But I still have issues getting this to work. Tigervnc doesn't seem to have an arm64 version. x11vnc installs, but I'm having trouble connecting. Have to figure out the exact cause. It could either be a firewall setting or some services colliding.

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Wim van Berlo replied to the topic 'keyboard messed up in Ekos/Kstars on Rock64' in the forum. 3 months ago

Can you recommend a good/stable vnc client for windows 8?
I just defaulted on rdp because it worked (so far)

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Wim van Berlo replied to the topic 'keyboard messed up in Ekos/Kstars on Rock64' in the forum. 3 months ago

Ihoujin wrote: There are known keyboard issues with certain VNC servers, such as with TightVNC. Switch to something like X11VNC or TigerVNC. I use x11vnc. it should resolve your issue.


Unfortunately: no luck
I use windows remote desktop to connect to the linux computer. On this I have xrdp running and tightvncserver installed. When I uninstall tightvncserver and install x11vnc, I can't get a connection with remote desktop. TigerVNC can't even be located. (Note that I run arm64 not armhf on my rock64. Maybe there's no arm64 version of tigervnc?)
I have now uninstalled vnc servers and reinstalled tightvnc. remote desktop allows me to start a session, but the keyboard is still messed up in kstars. Ie back to square 1.

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Wim van Berlo replied to the topic 'keyboard messed up in Ekos/Kstars on Rock64' in the forum. 3 months ago

Will try that. Thanks.

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Wim van Berlo created a new topic ' keyboard messed up in Ekos/Kstars on Rock64' in the forum. 3 months ago

When I use Kstars (v 2.9.3) on my Rock64 the keyboard is all messed up. I connect through Windows Remote Desktop from my laptop. The keyboard works fine in Ubuntu and OpenOffice. It even works fine in Kstars File menu. But when I try to edit a new profile in Ekos or try to find an object in Kstars, the keys are all jumbled, not the standard qwerty layout.
So far, I have used Kstars and Ekos on my laptop (windows), but I now want to use it directly on the Rock64.
Does anyone have a solution to this? Any help appreciated.

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Wim van Berlo replied to the topic 'Indi on the rocks (a Rock64 to be exact)' in the forum. 6 months ago

I can't really tell how much current it draws. I use mine with an ac adapter. My guess is that it draws about as much as the idroid. Current draw is (mainly) determined by speed of the processor, faster = more power hungry.

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Wim van Berlo replied to the topic 'Indi on the rocks (a Rock64 to be exact)' in the forum. 6 months ago

See attached image for details on my version of Ubuntu on the Rock



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Wim van Berlo replied to the topic 'Indi on the rocks (a Rock64 to be exact)' in the forum. 6 months ago

Yes, use the latest stable release. I reinstalled everything since my write up on stargazerslounge. That's why I would need to check which version I run now. I've also ordered a new Rock to replace other Pi. Atm I run one Rock for the camera/wheel, and a Pi for the mount and guiding. In this configuration, the Pi is the master. Downloading images over wifi, for focusing and aligning, is very slow (don't know why). I hope to speed this up with another Rock. For some reason, the Rock that I have, doesn't like two asi cameras at the same time. I use the camera Rock headless, and the desktop on the pi for phd guiding only.

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