Date   

Re: STAR TECH Ethernet->Serial

Mike C
 

OK, minutes later here, but after... hours... trying to get this to work, I changed the STAR TECH driver to use UDP instead of TCP and everything has been perfect since. I am now controlling my mount over wifi with that adapter mounted to my pier.

Any words of warning about using Eltima devices on both ends of APCC? (or words of validation, I'll take that too)

Mike


Re: STAR TECH Ethernet->Serial

Christopher Erickson
 

I have seen nothing but troubles trying to use Eltima software with APCC. AFAIKT, the problems are on the Eltima side of things.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Sat, May 15, 2021, 3:59 PM Mike C <mike@...> wrote:
I have an Intel NUC computer mounted on top of my telescope.

I want the simplest tether possible from pier to scope -- DC power and ground.

The NUC connects to my WI-FI access point and talks to a STAR TECH Ethernet->RS232 adapter which connects to my AP1200 GTO CP3.
The device: https://www.startech.com/en-us/networking-io/netrs2321p

STAR TECH seems to create an ELTIMA virtual serial port on the NUC to handle this device.
It looks like APCC is also creating ELTIMA ports. 

APCC seems to go bonkers trying to talk to the mount.  Any tips ? (like.. give up, is APCC compatible with Eltima port as main port?)

Cheers
Mike in Alaska


STAR TECH Ethernet->Serial

Mike C
 

I have an Intel NUC computer mounted on top of my telescope.

I want the simplest tether possible from pier to scope -- DC power and ground.

The NUC connects to my WI-FI access point and talks to a STAR TECH Ethernet->RS232 adapter which connects to my AP1200 GTO CP3.
The device: https://www.startech.com/en-us/networking-io/netrs2321p

STAR TECH seems to create an ELTIMA virtual serial port on the NUC to handle this device.
It looks like APCC is also creating ELTIMA ports. 

APCC seems to go bonkers trying to talk to the mount.  Any tips ? (like.. give up, is APCC compatible with Eltima port as main port?)

Cheers
Mike in Alaska


Re: Dual scope setup question

Christopher Erickson
 

Maybe elaborate on what you are asking?


-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   


On Sat, May 15, 2021, 6:08 AM <johnrogerjennings@...> wrote:
Ok Christopher,

You have to elaborate on the transformation.....

John


Re: Counterweight Shaft Travel Storage

John A. Sillasen
 

Thank you. So I've heard.  Good to know that's for sure. 

My problem is I got fittings with caps to go over both ends but the opening isn't wide enough to get the shaft out!!

One side isn't bad. I'd still have enough room to give it a push with a broomstick if needed but I need a threaded cap that goes over the tube opening that allows full access to the 2" ID PVC. 

I got schedule 40 PVC, not Schedule 80.  For the most part the only difference is color. 

Anyone know if Home Desperate has a cap that gives access to the entire 2" opening?  I imagine a rubber cap would do but it gives the danger of having the counterweight shaft push it off if enough turns to one direction made the shaft slide out!

Thoughts?



John A. Sillasen



Re: Dual scope setup question

John Jennings
 

Ok Christopher,

You have to elaborate on the transformation.....

John


Did the design of the 900GTO or SPA change at some point, so the RPA is not essential?

Chris White
 
Edited

At the beginning of the year I purchased a 2009 900GTO.  It came with the standard pier adapter, which I mounted everything on a Losmandy HD tripod with the AP FSA bolted right to the top.  I had multiple people tell me that adjusting azimuth was a bit of a pain with the SPA so I kept my eyes open for the rotating pier adapter.  I bought one when it popped up on the classifieds, but to be honest I havent felt any need to install it.  Adjusting azimuth with the SPA is buttery smooth and precise.  Am I missing out by not using the RPA?  Did something change at some point with the SPA or the 900 that improved adjustment?

I do have incentive to not use the RPA as it adds almost an inch to the height of my setup.  I have my mount in a very small back yard observatory that I built and while the extra height wont be a problem in position 5 for the refractor it cuts it close for the Edge scope I have when I close the roof.

And as any of you who have an observatory will attest... they make us even more LAZY as astronomers so breaking apart the setup to run a test sounds like work especially when everything is just sitting there ready to go on a moments notice! 

Thanks,


Re: How important is THUM? #APCC

Chris White
 
Edited

On Fri, May 14, 2021 at 11:37 PM, Worsel wrote:
That's pricey, considering the AstroMi MGBoxV2 is about 185USD (temp, pressure, RH, dewpt, and GPS data) and works well via ASCOM ObservCond with APCC.

https://www.astromi.ch/product/mgbox-v2/
Bryan,

Thanks for sharing this alternative.  For my case, I'll just stick with using the Pegasus Advance I already I have with temp and RH and the API for pressure.  My 900GTO already produces tight round stars without APCC Pro, so I think in the end adding another gadget will likely not get me better data.  I'm happy to be proven wrong though!  lol...


Re: How important is THUM? #APCC

Worsel
 

That's pricey, considering the AstroMi MGBoxV2 is about 185USD (temp, pressure, RH, dewpt, and GPS data) and works well via ASCOM ObservCond with APCC.

https://www.astromi.ch/product/mgbox-v2/

Bryan

---
PegasusAstro had also posted this today as well.
"Price range will be close to 350-400 USD and yes, we aim to provide the gps coord / temp and abs pressure to 10micron interface.


Re: Celestial Whale

Don Anderson
 

Thanks Rolando! I'll try that with my Tele Vue NP127is using the .8X reducer (528mm f/l). I can use your procedure to fine tune the calibration on my RAPAS.

Don Anderson


On Friday, May 14, 2021, 06:15:18 p.m. MDT, Roland Christen via groups.io <chris1011@...> wrote:


Start with my quick and easy daylight polar alignment (Park4, level etc.). Use your main imaging camera with H-a filter and send the mount to a bright star overhead. Use a wide field short FL scope (no SCTs). Have the camera aligned so that left-right is RA and up-down is Dec.

1) pull up the crosshair in MaximDL
2) Put the star on the crosshair and watch it drift for about 2 minutes. Use continuous mode and note the exact pixel where it ended up after 2 minutes.
3) Turn the azimuth adjuster until the star is at one end of your frame (left or right). Using your up-down slo-mo buttons, put the star back on the crosshair (not the center but at the edge).
4) Watch it drift for same exact amount of time. Note the exact pixel where it ended up.

Draw a line between the 2 end positions. Where it intersects the left-right crosshair is where you want to put this star using the azimuth adjusters.

I take two images of the star's positions and layer one on top of the other so that both stars can be seen. Then use a line tool to draw the line between them.

Rolando





-----Original Message-----
From: Don Anderson via groups.io <jockey_ca@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Fri, May 14, 2021 5:56 pm
Subject: Re: [ap-gto] Celestial Whale

And what is that?

Don Anderson


On Friday, May 14, 2021, 02:01:23 p.m. MDT, Roland Christen via groups.io <chris1011@...> wrote:


MaximDL has no way to tell. However it has a nifty tool that I developed to get the drift to zero in just a few minutes.

Rolando



-----Original Message-----
From: Jeff B <mnebula946@...>
To: main@ap-gto.groups.io
Sent: Fri, May 14, 2021 2:02 pm
Subject: Re: [ap-gto] Celestial Whale

Yeah I'm curious too but I also imagine the software can tell you too.

On Fri, May 14, 2021 at 2:51 PM Worsel via groups.io <bryancashion=yahoo.com@groups.io> wrote:
Roland

That's amazing performance.  Do you have an idea how polar mis-aligned the setup was, even qualitatively?

Bryan

--
Roland Christen
Astro-Physics

--
Roland Christen
Astro-Physics


Re: Celestial Whale

Roland Christen
 

Start with my quick and easy daylight polar alignment (Park4, level etc.). Use your main imaging camera with H-a filter and send the mount to a bright star overhead. Use a wide field short FL scope (no SCTs). Have the camera aligned so that left-right is RA and up-down is Dec.

1) pull up the crosshair in MaximDL
2) Put the star on the crosshair and watch it drift for about 2 minutes. Use continuous mode and note the exact pixel where it ended up after 2 minutes.
3) Turn the azimuth adjuster until the star is at one end of your frame (left or right). Using your up-down slo-mo buttons, put the star back on the crosshair (not the center but at the edge).
4) Watch it drift for same exact amount of time. Note the exact pixel where it ended up.

Draw a line between the 2 end positions. Where it intersects the left-right crosshair is where you want to put this star using the azimuth adjusters.

I take two images of the star's positions and layer one on top of the other so that both stars can be seen. Then use a line tool to draw the line between them.

Rolando





-----Original Message-----
From: Don Anderson via groups.io <jockey_ca@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Fri, May 14, 2021 5:56 pm
Subject: Re: [ap-gto] Celestial Whale

And what is that?

Don Anderson


On Friday, May 14, 2021, 02:01:23 p.m. MDT, Roland Christen via groups.io <chris1011@...> wrote:


MaximDL has no way to tell. However it has a nifty tool that I developed to get the drift to zero in just a few minutes.

Rolando



-----Original Message-----
From: Jeff B <mnebula946@...>
To: main@ap-gto.groups.io
Sent: Fri, May 14, 2021 2:02 pm
Subject: Re: [ap-gto] Celestial Whale

Yeah I'm curious too but I also imagine the software can tell you too.

On Fri, May 14, 2021 at 2:51 PM Worsel via groups.io <bryancashion=yahoo.com@groups.io> wrote:
Roland

That's amazing performance.  Do you have an idea how polar mis-aligned the setup was, even qualitatively?

Bryan

--
Roland Christen
Astro-Physics

--
Roland Christen
Astro-Physics


Re: Counterweight Shaft Travel Storage

M Hambrick
 

Those PVC cutting tools don't do that good a job anyway. The cut never seems to be square. You could probably do better with a hacksaw. It just takes a little longer, and you will have to get rid of the burr on the edge where you cut it. 150 grit Sandpaper does a good job for this.

Mike


Re: Dual scope setup question

M Hambrick
 

I have run multiple sessions of MaxIm DL, each controlling a separate camera, but it gets quirky from time to time. I have never encountered any problems with guiding, but the camera temperature controls seem to get confused as to which camera is which. 

Diffraction Ltd has introduced an enhancement to MaxIm DL called Maestro. It looks like it may be geared towards those who are running multiple cameras.


Mike


Re: Celestial Whale

Don Anderson
 

And what is that?

Don Anderson


On Friday, May 14, 2021, 02:01:23 p.m. MDT, Roland Christen via groups.io <chris1011@...> wrote:


MaximDL has no way to tell. However it has a nifty tool that I developed to get the drift to zero in just a few minutes.

Rolando



-----Original Message-----
From: Jeff B <mnebula946@...>
To: main@ap-gto.groups.io
Sent: Fri, May 14, 2021 2:02 pm
Subject: Re: [ap-gto] Celestial Whale

Yeah I'm curious too but I also imagine the software can tell you too.

On Fri, May 14, 2021 at 2:51 PM Worsel via groups.io <bryancashion=yahoo.com@groups.io> wrote:
Roland

That's amazing performance.  Do you have an idea how polar mis-aligned the setup was, even qualitatively?

Bryan

--
Roland Christen
Astro-Physics


Re: Counterweight Shaft Travel Storage

Don Anderson
 

John
Just use a hack saw. Nothing special needed.

Don Anderson


On Friday, May 14, 2021, 01:13:47 p.m. MDT, John A. Sillasen <jasillasen@...> wrote:


Very good & solid (grin) advice,  Fernando, thank you. In fact,  I have threaded caps for both ends.  I think I plan to have the case and its contents,  lying under my bad and between the ScopeGuard case with the Mach 1 and a bunch of eyepiece cases or the Stowaway case.  The Mach 1 tends to ride with me even if the 1100 is to be the primary mount. 

I think,  at least at this point,  the Eagle Pier will come out so the ATS Pier can be strapped against the wall in the same location that held the Eagle. Not that any of that has to do with the counterweight shaft and its carry case, just free association for space management.  I gain very little taking the ScopeGuard case out and it does a good job keeping things on the bed in the van where I left them for travel.

Good advice,  thank you.  I do hate the thought of buying a special tool for cutting the PVC pipe to size for this one time job, though. I've got the purple goo to put the male thread cap on the pipe.  Maybe just a Iittle Teflon tape over the threads will help keep the end caps on better. 

Thanks for all the advice!  Exactly what the purpose of this group is and it does it well.



John A. Sillasen



Re: How important is THUM? #APCC

ap@CaptivePhotons.com
 

The GPS part is interesting – I am right now doing my own little Raspberry Pi weather setup primarily to get an immediate rain indication with an RG-9 sensor, not a cloud sensor.  It works, is tied to my Home Assistant automation, all good…

 

But I have the GPS coordinates as well from an attached GPS (as well as PPS/GPS time sync).

 

How, i.e. by what mechanism, could this be fed to the AP software/mount?  Does the AP ASCOM driver permit update of the lat/long (some, like the Paramount, only permit read)?

 

The weather stuff is pretty obvious through the safety or observing conditions driver, but it looks like most stuff either expects the mount to have the GPS. 

 

I can’t find an ASCOM driver template that addresses coordinates other than the mount. Some software like NINA, can search for a cooperative COM port if you have a GPS plugged into the windows USB on which it is running, but not pulled from another box, and not via ASCOM as best I can tell (other than from the ASCOM connection to the mount).  

 

(Yes, this is a sign I am bored while I wait for my AP1100 – save me from continuing to home build electronics before I solder my hands together!  Ship my mount!  😊 )

 

Linwood

 

PS. I didn’t do it for GPS, clearly keying it in occasionally is easy, I did it for the optical rain sensor.  But… once you collect data, you want to do something with it!

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of John Chakel via groups.io
Sent: Friday, May 14, 2021 3:16 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] How important is THUM? #APCC

 

PegasusAstro had also posted this today as well.
"Price range will be close to 350-400 USD and yes, we aim to provide the gps coord / temp and abs pressure to 10micron interface.
"


Re: Dual scope setup question

Christopher Erickson
 

I would say that in just about every case of using two or more scopes on the same mount, everything hinges on what you want to accomplish and what suite of software exists that can do it. Usually a very, very short list. And then invest in the right hardware that is supported by that software.

And expect the entire software/hardware ecosystem to be radically transformed every three or so years. For better or worse.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Fri, May 14, 2021, 9:16 AM Emilio J. Robau, P.E. <ejr@...> wrote:

I would say coordinated dithering and coordinated focusing are the issues.  However, the latter is less of an issue.

 

From: Emilio J. Robau, P.E.
Sent: Friday, May 14, 2021 3:15 PM
To: main@ap-gto.groups.io
Subject: RE: [ap-gto] Dual scope setup question

 

I guess running one at a time would be okay, but what is the sense?   With the cheap Chinese cameras you could get lucky and get a good camera and run both cameras at one time.  Why not?

 

NINA, SGP, APT, and Voyager can deal with multiple instances with no issues.  I have run the QHY 294 and a ASI 1600 along with a Moravian 16200 with no issues.  I have run all the aforementioned applications with an array.   I ran the 294 in 1 bin mode and it produced 92 meg subs.   That is the largest size sub I have encountered.  No issues.

 

The main issue is coordinated dithering.  APT can’t focus embedded in a sequence so that one is not very useful due to that lack of functionality.

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Christopher Erickson
Sent: Friday, May 14, 2021 3:09 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Dual scope setup question

 

If you are only running one at a time, having a NUC for each cam and OTA works fine.

 

In fact I don't know of any capturing software that can handle two big cams at once and be able to handle automated scheduling.


-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

 

On Fri, May 14, 2021, 4:45 AM Emilio J. Robau, P.E. <ejr@...> wrote:

I run three scopes on one AP1600 mount with one computer.   I don’t know how you would get coordinated dithering if you place a computer on each scope and think that having multiple computers on one mount is not the solution.   The only challenge I have besides and occasional flexure of one of the scopes which misaligns it is coordinated dithering.  I just trash a sub or two when dithering interferes.   NINA has coordinated dithering, but I have not tried it yet.  I find it somewhat efficient to just lose a sub or two due to dithering.

 

Emilio

 

Chris,

 

I never thought about this, it is a great idea to use 2 computers to make two systems independent. 

 

Yanzhe

 

On Wed, May 12, 2021 at 11:44 PM Christopher Erickson <christopher.k.erickson@...> wrote:

Personally if I were doing a dual scope setup on one mount I would put a NUC on top of each OTA and have two serial cords going down to the two serial ports on the CP3/4/5. SO MUCH EASIER to get the software bits to all work correctly when each NUC only sees one cam, one filter wheel, one mount, one focuser, one autoguider, etc.

 

Or MUCH BETTER yet, give each OTA it's own AP mount.

 

And just like I always say...


"My advice is free and worth every penny!"

 

-Christopher Erickson

Observatory Engineer

Summit Kinetics

Waikoloa, Hawaii

 

 

Virus-free. www.avg.com

 

On Wed, May 12, 2021 at 6:02 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

If each gas it's own OAG, no problem.

I can't advise on 'wiring' as I use an AP1200 which doesn't have
thru the mount access. I would say just minimize and carefully
route the cables, bundle and cord wrap.


Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 7:16 pm
Subject: Re: [ap-gto] Dual scope setup question

Yes, Imaging.

 

When you say both can work, are you talking about "piggy back" and "side by side"?

How about power supply and USB?

 

Each will have its own OAG to eliminate flexure.

 

Yanzhe

 

On Wed, May 12, 2021 at 2:09 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

By 'one at a time", are you referring to imaging?
Either way can work, I've done both.
The biggest issue will be the possibility of flexure between
components depending on how you will be guiding.
If you intend to use an off axis guider on both scopes, no problem.
If you intend to use a guide scope of some sort, be wary of how it's
mounted. Scopes are usually mounted in rings which have felt, cork or
some other material lining them. If a guide scope is mounted on the rings,
the main scope can move slightly within the rings which the guider won't

know about. The result, oval or trailed stars.

 

To prevent this, mount the guide scope directly on the primary instrument, not
on the rings.
This also applies to a side by side set up where you mount the guide scope
on the side by side plate.

Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 3:53 pm
Subject: [ap-gto] Dual scope setup question

Have been thinking of setting up two scopes (4" and 5") on AP1100, only 1 scope will be used at any time.

A few questions on exactly how it should be configured/connected.

- Piggy back vs side by side? Which is the preferred way.

- I am thinking of having 3 110v/12V power adapters, and 3 USB ports.

One power adapter and one USB port are for connecting GTOCP3.

Each telescope will have a power adapter and a USB port, which provide power and communication for all gears eg, CCD/focuser/dew controller/USB hub etc.

 

I am not too sure whether there are any potential issues with this setup:

- Can all 4 cables (2 powers and 2 USB2 cables) go through AP1100?

- Is there any concern on the electrical side, e.g. USB ground loop or something similar?

- Or is it possible to have 2 scopes sharing the same power and USB? Then I need a IP controller 12v power switch?

 

Yanzhe

 

 


Re: Celestial Whale

Roland Christen
 

MaximDL has no way to tell. However it has a nifty tool that I developed to get the drift to zero in just a few minutes.

Rolando



-----Original Message-----
From: Jeff B <mnebula946@...>
To: main@ap-gto.groups.io
Sent: Fri, May 14, 2021 2:02 pm
Subject: Re: [ap-gto] Celestial Whale

Yeah I'm curious too but I also imagine the software can tell you too.

On Fri, May 14, 2021 at 2:51 PM Worsel via groups.io <bryancashion=yahoo.com@groups.io> wrote:
Roland

That's amazing performance.  Do you have an idea how polar mis-aligned the setup was, even qualitatively?

Bryan

--
Roland Christen
Astro-Physics


Re: Dual scope setup question

Emilio J. Robau, P.E.
 

I would say coordinated dithering and coordinated focusing are the issues.  However, the latter is less of an issue.

 

From: Emilio J. Robau, P.E.
Sent: Friday, May 14, 2021 3:15 PM
To: main@ap-gto.groups.io
Subject: RE: [ap-gto] Dual scope setup question

 

I guess running one at a time would be okay, but what is the sense?   With the cheap Chinese cameras you could get lucky and get a good camera and run both cameras at one time.  Why not?

 

NINA, SGP, APT, and Voyager can deal with multiple instances with no issues.  I have run the QHY 294 and a ASI 1600 along with a Moravian 16200 with no issues.  I have run all the aforementioned applications with an array.   I ran the 294 in 1 bin mode and it produced 92 meg subs.   That is the largest size sub I have encountered.  No issues.

 

The main issue is coordinated dithering.  APT can’t focus embedded in a sequence so that one is not very useful due to that lack of functionality.

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Christopher Erickson
Sent: Friday, May 14, 2021 3:09 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Dual scope setup question

 

If you are only running one at a time, having a NUC for each cam and OTA works fine.

 

In fact I don't know of any capturing software that can handle two big cams at once and be able to handle automated scheduling.


-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

 

On Fri, May 14, 2021, 4:45 AM Emilio J. Robau, P.E. <ejr@...> wrote:

I run three scopes on one AP1600 mount with one computer.   I don’t know how you would get coordinated dithering if you place a computer on each scope and think that having multiple computers on one mount is not the solution.   The only challenge I have besides and occasional flexure of one of the scopes which misaligns it is coordinated dithering.  I just trash a sub or two when dithering interferes.   NINA has coordinated dithering, but I have not tried it yet.  I find it somewhat efficient to just lose a sub or two due to dithering.

 

Emilio

 

Chris,

 

I never thought about this, it is a great idea to use 2 computers to make two systems independent. 

 

Yanzhe

 

On Wed, May 12, 2021 at 11:44 PM Christopher Erickson <christopher.k.erickson@...> wrote:

Personally if I were doing a dual scope setup on one mount I would put a NUC on top of each OTA and have two serial cords going down to the two serial ports on the CP3/4/5. SO MUCH EASIER to get the software bits to all work correctly when each NUC only sees one cam, one filter wheel, one mount, one focuser, one autoguider, etc.

 

Or MUCH BETTER yet, give each OTA it's own AP mount.

 

And just like I always say...


"My advice is free and worth every penny!"

 

-Christopher Erickson

Observatory Engineer

Summit Kinetics

Waikoloa, Hawaii

 

 

Virus-free. www.avg.com

 

On Wed, May 12, 2021 at 6:02 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

If each gas it's own OAG, no problem.

I can't advise on 'wiring' as I use an AP1200 which doesn't have
thru the mount access. I would say just minimize and carefully
route the cables, bundle and cord wrap.


Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 7:16 pm
Subject: Re: [ap-gto] Dual scope setup question

Yes, Imaging.

 

When you say both can work, are you talking about "piggy back" and "side by side"?

How about power supply and USB?

 

Each will have its own OAG to eliminate flexure.

 

Yanzhe

 

On Wed, May 12, 2021 at 2:09 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

By 'one at a time", are you referring to imaging?
Either way can work, I've done both.
The biggest issue will be the possibility of flexure between
components depending on how you will be guiding.
If you intend to use an off axis guider on both scopes, no problem.
If you intend to use a guide scope of some sort, be wary of how it's
mounted. Scopes are usually mounted in rings which have felt, cork or
some other material lining them. If a guide scope is mounted on the rings,
the main scope can move slightly within the rings which the guider won't

know about. The result, oval or trailed stars.

 

To prevent this, mount the guide scope directly on the primary instrument, not
on the rings.
This also applies to a side by side set up where you mount the guide scope
on the side by side plate.

Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 3:53 pm
Subject: [ap-gto] Dual scope setup question

Have been thinking of setting up two scopes (4" and 5") on AP1100, only 1 scope will be used at any time.

A few questions on exactly how it should be configured/connected.

- Piggy back vs side by side? Which is the preferred way.

- I am thinking of having 3 110v/12V power adapters, and 3 USB ports.

One power adapter and one USB port are for connecting GTOCP3.

Each telescope will have a power adapter and a USB port, which provide power and communication for all gears eg, CCD/focuser/dew controller/USB hub etc.

 

I am not too sure whether there are any potential issues with this setup:

- Can all 4 cables (2 powers and 2 USB2 cables) go through AP1100?

- Is there any concern on the electrical side, e.g. USB ground loop or something similar?

- Or is it possible to have 2 scopes sharing the same power and USB? Then I need a IP controller 12v power switch?

 

Yanzhe

 

 


Re: How important is THUM? #APCC

John Chakel
 

PegasusAstro had also posted this today as well.
"Price range will be close to 350-400 USD and yes, we aim to provide the gps coord / temp and abs pressure to 10micron interface.
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