Date   

Re: How feasible is tandem imaging with AP1100 with or without AE and 2 1000mm refractors with ~0.8"/px image scale?

Karen Christen
 

Pretty cool little rollaway observatory shed thingy, Peter.  Don’t think I’ve seen one like that before.

Karen

AP

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Roland Christen via groups.io
Sent: Saturday, July 2, 2022 1:13 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] How feasible is tandem imaging with AP1100 with or without AE and 2 1000mm refractors with ~0.8"/px image scale?

 

Hola Kau! That's a lotta wiring.

 

Rolando

 

 

-----Original Message-----
From: Peter Bresler via groups.io <PABresler@...>
To: main@ap-gto.groups.io
Sent: Sat, Jul 2, 2022 12:21 pm
Subject: Re: [ap-gto] How feasible is tandem imaging with AP1100 with or without AE and 2 1000mm refractors with ~0.8"/px image scale?

Here is my setup on the 1200.


--
Roland Christen
Astro-Physics


--
Karen Christen
Astro-Physics


Re: Problem with meridian flip #Mach2GTO #APCC

Karen Christen
 

That’s a really nice result, David!

Karen

AP

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of David Johnson
Sent: Saturday, July 2, 2022 10:20 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Problem with meridian flip #Mach2GTO #APCC

 

Thanks for the help.  I had never needed to set a delay before, but with this system, it appears to be necessary.  Worked fine for three nights in a row.  First wide-field image using the Mach2.  Result here.


--
Karen Christen
Astro-Physics


Re: #ASCOM_V2_Driver alpaca move rate #ASCOM_V2_Driver

Ray Gralak
 

Yan,

You will need to contact the ASCOM group for help with Alpaca usage. The AP V2 ASCOM driver knows nothing about Alpaca.

However, earlier firmware versions of the control box may limit the button rate to 99.999x even though the slew rate can be set to 600x. There is no provision for specifying these separate limits in ASCOM.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of fantei@...
Sent: Tuesday, July 5, 2022 12:23 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] #ASCOM_V2_Driver alpaca move rate

Hi Ray
Thank you
when i move the mount with AP V2 ASCOM in 600, i can see that the move is fast. (its ok)
but with Alpaca in 2.5 the displacement corresponds to a speed 12 in ASCOM

I can't find the correspondence for 2.5 to 600
i use "moveaxis" alpaca command:
api/v1/telescope/0/moveaxis", {'Axis': 0,'Rate': 2.5})
yan


Re: 400GTO

Chris White
 

I noticed on the data sheet that this grease is not recommended "As a lubricant in metal bearings"

I emailed Daleen instead to place an order for the AP special grease. 

Also, when I took DEC apart last night I found that one of the little clutch plug tips was crack and wedged in the last threads.  I had to really force it out, so I kind of doubt it was doing much other than just being stuck. 

On another note, I love the simplicity of this mount design.  I've rebuilt Orion Atlas mounts before when I hypertuned them and this 400GTO is so much better internally.  The quality of the components and machining as well as the decisions for how to put it all together are so well thought out.  As Roland said this is a 30 year old design! 

The good news is that the grease looked old, black and tired and I think a full service is in store.  I suspect that most of my challenges with this new to me mount are likely service related. 


M57 from Paris suburbs (first image with my AP900)

Dan_Paris
 
Edited

Hello everyone,

here is the first image with my AP900 that I got few weeks ago. There's absolutely nothing to say about the mount, it just works. Flawlessly from the first to the last sub.  The scope is a custom-made carbon 8" f/4 Newtonian astrograph with Romano Zen optics and a 2.5" Wynne corrector. The camera is an ASI183mm with small 2.4µm pixels.

Here is a crop on the nebula and neighbor galaxy, enlarged at 125%

http://www.astrosurf.com/uploads/monthly_2022_07/M57_crop.jpg.c70a4831aee85b355d7078ffdd3a3d71.jpg

And the full image at 100%

I mixed the luminance and red channels with 40% of H-alpha, in starless mode.

Have a nice day !

Dan


Technical data :
200/800 custom Newtonian astrograph with Romano Zen optics and carbon fiber tube
TS 2.5" Riccardi-Wynne corrector
ASI183mm + ZWO LRGB filters
Guiding : ZWO OAG  + ASI120mm mini + AsiairV1
Luminance : 90 *60sec
Chrominance : 20*60sec each channel
H-alpha : 200*60 sec
Darks, flats and synthetic biases
Conditions : Bortle 7 skies in Paris' suburbs (20km from the Eiffel tower),  fair seeing (2" to 2.3" after stacking)
Preprocessing and stacking with Siril, processing with Pixinsight and Rawtherapee

 


Re: #ASCOM_V2_Driver alpaca move rate #ASCOM_V2_Driver

fantei@...
 

Hi Ray
Thank you
when i move the mount with AP V2 ASCOM in 600, i can see that the move is fast. (its ok)
but with Alpaca in 2.5 the displacement corresponds to a speed 12 in ASCOM 

I can't find the correspondence for 2.5 to 600
i use "moveaxis" alpaca command:
api/v1/telescope/0/moveaxis", {'Axis': 0,'Rate': 2.5})
yan


Sadr Region - HA

Bill Long
 

Did some model testing and grabbed 3.5 hours of Sadr in HA. Epsilon E160ED scope, AP Mach 2 mount, unguided subs of 5 mins. Camera is the QHY600 full frame CMOS. Filter was the Astronomik MaxFR 6nm. 



Pretty neat data, and massively wide field. The combo is coming along nicely.

-Bill 


Re: Things NOT to do

Bill Long
 

Agreed. Placing the burden of solving the issue in terms of work, on users, is a bad thing.

From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Andrew Burwell via groups.io <andrew_burwell@...>
Sent: Monday, July 4, 2022 6:00 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] Things NOT to do
 
Honestly, there is an easy solution for this. Most equipment listings are just variations of the same thing. He should have been able to mass migrate all the obvious stuff, and leave users to sort only the things that were less obvious. This would make it easier on everyone, and would get you a faster migration process.


Re: Things NOT to do

Andrew Burwell
 

Honestly, there is an easy solution for this. Most equipment listings are just variations of the same thing. He should have been able to mass migrate all the obvious stuff, and leave users to sort only the things that were less obvious. This would make it easier on everyone, and would get you a faster migration process.


Re: Ocean-side location corrosion precautions

Christopher Erickson
 

Conformal coatings are good for boards that aren't already contaminated. Not so good for already-contaminated boards. There are ways to clean contaminated boards to stabilize them, dry them and then coat them.

I use Marine connector silicon grease, a.k.a. O-ring grease in just about all electrical connectors. Displaces air, humidity and whatever else might be carried around in the air, like salt.

Raw and burned diesel fumes can be rather corrosive too. Keep fumes from diesel fuel cans/barrels and diesel engine/generator exhaust well away from your precious observatory and anything else you care about.

I only use stainless steel fasteners everywhere in all observatories and equipment, regardless of proximity to salt air.

To prevent galling and damaged/broken parts, always add a small drop of oil to stainless and aluminum threads before putting things together. 

I only use stainless wood screws in observatories with wood components. I never use nails whenever they can be avoided. Observatories are not static structures, they are dynamic machines with moving parts. Nails are just about always completely unsuitable for machines. When using nails, everything works loose over time.

I recommend using fiber optic communications wherever possible. Minimize damage due to ESD, GPR, RFI, etc. My preference is for 50 micron multimode. It is more tolerant of dirty connectors and such versus single-mode fibers. 

All USB connectors suck and are unreliable. Currently USB-C is the least horrible USB connector. USB-A is the most horrible. Just FYI.

Keep all copper conductor cables in an observatory as short as possible. I put NUC's on OTA's and control them remotely. 

I use big SSD drives in all observatory computers. Especially above about 2.5 km elevation. Mechanical drives have air cushion bearings that keep the heads near but not touching the spinning discs. Thin air is dangerous for them.

Never let any cable run openly across a floor. Copper conductor cables will be at greater risk from ESD & GPR. Fiber cables will be at risk of damage from being stepped on. Also a tripping hazard.

Leaving USB/Ethernet/etc. cables with one end unconnected laying on or near a floor in dry, static-prone climates is almost guaranteeing getting a USB/Ethernet/etc. port blown out by ESD.

I hope this helps.

"Always take the high road. There's less traffic."

-Christopher Erickson
Observatory Engineer
Summit Kinetics
Waikoloa, Hawaii


On Mon, Jul 4, 2022 at 1:43 PM Brian Valente <bvalente@...> wrote:
Hi Steve

I had to deal with this recently. One of the things I added was conformal coating to the circuit boards/electronics. It shields the boards from corrosion


On Mon, Jul 4, 2022 at 3:09 PM Steve Wilkins <stevewilkinsmail@...> wrote:
Yes that was my understanding. Good suggestion on the stainless, thanks, I do see some signs of corrosion on the small level on the baseplate; not too worrying as it’s not core to the mount’s function, looks like it might be plated steel. 



--


Re: Things NOT to do

Chris White
 

On Mon, Jul 4, 2022 at 04:12 PM, Bill Long wrote:
It wants someone to migrate every piece a gear they have ever used. So for those that have some really old images (even those moved to staging) it is asking you to migrate tons of gear via a very slow and clunky interface.
So far I've been ignoring those emails.....

I'm also annoyed by the revision selection.  If you click on a revision it opens it up in a popup window.  I'm sure all these issues will sort out and in the long run it will be a better product, but for now I just hate it when places go and change things that are already working and make them worse.  Abin's equipment database has been very poor for so many years, that it takes a lot of fixing to sort it out as there are years of inputs that have been done in a poor way. 

Every time I go to buy a pair of shoes just like the pair I wore out they've been discontinued or changed and I have to start over to find a pair that makes my feet happy.  There should be a law against this... 


Re: 400GTO

Chris White
 
Edited

This is the grease I have on hand: https://www.duniway.com/images/_pg/datasheet-DC-150.pdf

It is Dow Corning High Vacuum Grease. 

Silicone Base and rated for -40C to 204C degrees.

I remember reading something from Roland about avoiding sulfur, and I dont see that this contains any.

EDIT-  I can also buy some of the AP special sauce if this grease is not recommended.


Re: Ocean-side location corrosion precautions

 

Hi Steve

I had to deal with this recently. One of the things I added was conformal coating to the circuit boards/electronics. It shields the boards from corrosion


On Mon, Jul 4, 2022 at 3:09 PM Steve Wilkins <stevewilkinsmail@...> wrote:
Yes that was my understanding. Good suggestion on the stainless, thanks, I do see some signs of corrosion on the small level on the baseplate; not too worrying as it’s not core to the mount’s function, looks like it might be plated steel. 




Re: 400GTO

Chris White
 

Cool!  Thanks roland!


Re: 400GTO

Roland Christen
 

A loose nut will show as backlash in PHD. Will see it if you physically push and pull on the axis
A worm that's not fully in mesh will show as backlash in PHD. Will see it if you push and pull on the axis.
A spur transfer gear that's not fully in mesh will show as backlash in PHD. Will not see it by pushing and pulling on the axis.

3 places to look. Take covers off and explore.
If you can't figure out where the backlash is coming from, you may need the mount serviced. I'm sure we can find the place that has backlash.

I don't know your particular build, but I believe this mount has a stepper drive with a gearbox on the stepper. If none of the above, then it's possible that the gearbox has inherent backlash. In that case we may or may not be able to fully fix it. It is a very old mount that goes back some 30 years, and may have seen a lot of use (and wear). Backlash inn the stepper gearbox will not be visible as play in the mount axis (when you push and pull on the back of the scope).

Roland

-----Original Message-----
From: Chris White <chris.white@...>
To: main@ap-gto.groups.io
Sent: Mon, Jul 4, 2022 4:46 pm
Subject: Re: [ap-gto] 400GTO

Good tip on the nut. 

Would A loose nut be seen as backlash in phd?

You are correct. While I feel wiggle in both axis, I only have a problem in declination. The backlash is so great that it is not able to be measured by guiding assistant. 

--
Roland Christen
Astro-Physics


Re: Ocean-side location corrosion precautions

Steve Wilkins
 

Thanks Christopher, I’ll reach out separately to explore how to best achieve these


Re: Ocean-side location corrosion precautions

Steve Wilkins
 

Yes that was my understanding. Good suggestion on the stainless, thanks, I do see some signs of corrosion on the small level on the baseplate; not too worrying as it’s not core to the mount’s function, looks like it might be plated steel. 


Re: 400GTO

Chris White
 

Good tip on the nut. 

Would A loose nut be seen as backlash in phd?

You are correct. While I feel wiggle in both axis, I only have a problem in declination. The backlash is so great that it is not able to be measured by guiding assistant. 


Re: 400GTO

Roland Christen
 


f the worms are fully in mesh, then it's possible that the end-play not is loose.
It should say end play nut.

Rolando


-----Original Message-----
From: Roland Christen via groups.io <chris1011@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Mon, Jul 4, 2022 4:36 pm
Subject: Re: [ap-gto] 400GTO


Thanks Roland. I do have play in the axis, but any tighter and it stalls. 
If the worms are fully in mesh, then it's possible that the end-play not is loose. This is the adjustable nut on the end of the worm gear that holds it in place. If it's loose, then the worm gear is able to move back and forth sideways as you push on the scope or counterweight shaft.

By the way, having backlash in RA has zero effect on guiding. In Dec you want to have little or no backlash, because during guiding you will be reversing the axis as the guide software tries to keep the star on the centerline. If there is too much backlash delay, it takes a long time for the axis to react during a reversal.

Roland


-----Original Message-----
From: Chris White <chris.white@...>
To: main@ap-gto.groups.io
Sent: Mon, Jul 4, 2022 3:57 pm
Subject: Re: [ap-gto] 400GTO

Thanks Roland. I do have play in the axis, but any tighter and it stalls. 

I'll remove the housing and take a look.

It's a fun project!

Ps- will any high end silicone grease with good temperature ratings be ok?  I have a high end silicone vacuume grease on hand. Otherwise I can get the 105 grease specified in the service guide you made. 

Thanks and happy 4th!

--
Roland Christen
Astro-Physics

--
Roland Christen
Astro-Physics


Re: 400GTO

Roland Christen
 


Thanks Roland. I do have play in the axis, but any tighter and it stalls. 
If the worms are fully in mesh, then it's possible that the end-play not is loose. This is the adjustable nut on the end of the worm gear that holds it in place. If it's loose, then the worm gear is able to move back and forth sideways as you push on the scope or counterweight shaft.

By the way, having backlash in RA has zero effect on guiding. In Dec you want to have little or no backlash, because during guiding you will be reversing the axis as the guide software tries to keep the star on the centerline. If there is too much backlash delay, it takes a long time for the axis to react during a reversal.

Roland


-----Original Message-----
From: Chris White <chris.white@...>
To: main@ap-gto.groups.io
Sent: Mon, Jul 4, 2022 3:57 pm
Subject: Re: [ap-gto] 400GTO

Thanks Roland. I do have play in the axis, but any tighter and it stalls. 

I'll remove the housing and take a look.

It's a fun project!

Ps- will any high end silicone grease with good temperature ratings be ok?  I have a high end silicone vacuume grease on hand. Otherwise I can get the 105 grease specified in the service guide you made. 

Thanks and happy 4th!

--
Roland Christen
Astro-Physics

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