Date   

Re: Counterweight Shaft Travel Storage

John A. Sillasen
 

I appreciate the information Dr. Barry. Like you, my post on a case for 1100 was several years ago too. Sometimes, you just need to reevaluate past choices. In my case having the counterweight shaft in the case with the mount was too heavy. My case was damaged in a tree fall so I had an opportunity to get a new design going, sans counterweight shaft.

How concerned should I be about an 'almost air tight' fit inside schedule 80 tubing?
Did you ever have a problem getting the shaft out of the tube when it was hot, cold or freezing &/or extremely humid conditions?

Wonder if I can make a pipe tube with screw on ends properly?  I've always found the closed cell ethafoam (DuPont), used by Astro-Physics when used with scopes, counterweights & mounts to be exceptionally strong and protective.  I may use it at the top and bottom of the tubes.  Well, if what you said about almost air tight isn't a concern that I may not be able to get the counterweight shaft out of the tube!

Appreciate the information and any further insight you may provide.

Thank you,


John A. Sillasen



Is pulse guiding of a Asro-Physics mount limited to using Ascom?

Allen Ruckle
 

I am curious to know if using INDI for guiding a A-P mount can perform Pulse Guiding or is ASCOM the only format that does Pulse Guiding?

aruckle


Re: Dual scope setup question

Bruce Donzanti
 

I am in a permanent setup in an observatory.  Power comes from my house up to the observatory to a 110/120VAC to 12 vdc, 25A power supply which runs up to the GTOCP4 control box and the scope where I have a powered USB hub and a Linx Power Panel with 6 Anderson Power Pole Connectors.   While they are both powered at the same time, I seldom would use both simultaneously.   

On Wed, May 12, 2021 at 8:18 PM yanzhe liu <liuyanzhe@...> wrote:
How do you power and access two CCDs? I dont want to power both since I will use one at a time.

Yanzhe

On Wed, May 12, 2021 at 2:16 PM Bruce Donzanti <donza2735@...> wrote:
I have an 80mm piggybacked on top of my C11" on my AP1100.  Cameras on both with filter wheels and auto-focusers 7 USB ports.  I use to guide the 80mm with the OAG on the C11 and that works most of the time.  However, during windy nights it could struggle so I placed a second OAG on the 80mm and it works fine all of the time.  


Re: Counterweight Shaft Travel Storage

fernandorivera3
 

I know Office Depot sells or used to sell, a black plastic type of case for storage of big documents <like technical blueprints>, that you can roll up <paperwork> to place within <the case>. You can screw in place the cap at the open end. The case was variable length meaning you could extend or collapse it as needed! Plus it had a shoulder strap, too 👍 This type of documents transport case could easily hold the AP stainless steel counterweight shaft & it's lightweight too. Plus even on rough road trips if the shaft gets bounced around a lot it won't dent the inside of your vehicle because the long case offers protection from bumps & bruises. 

Fernando


Re: Dual scope setup question

drgert1
 

An SBIG AO system on one of the OTAs will make it independent of guide moves of the other. As long as the flexure doesn't exceed the excursion range of the AO it will be fine.

Cheers,
Gert


Re: Dual scope setup question

yanzhe liu
 

How do you power and access two CCDs? I dont want to power both since I will use one at a time.

Yanzhe

On Wed, May 12, 2021 at 2:16 PM Bruce Donzanti <donza2735@...> wrote:
I have an 80mm piggybacked on top of my C11" on my AP1100.  Cameras on both with filter wheels and auto-focusers 7 USB ports.  I use to guide the 80mm with the OAG on the C11 and that works most of the time.  However, during windy nights it could struggle so I placed a second OAG on the 80mm and it works fine all of the time.  


Re: Dual scope setup question

yanzhe liu
 

Thanks, I'll check it out

Yanzhe

On Wed, May 12, 2021 at 2:18 PM Worsel via groups.io <bryancashion=yahoo.com@groups.io> wrote:
Yanzhe

There was a short thread on the dual scope topic back in March.  In fact, it was specific to the 1100, so you may find useful info at
https://ap-gto.groups.io/g/main/topic/81188350#76876

Bryan


Re: Dual scope setup question

yanzhe liu
 

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: Counterweight Shaft Travel Storage

Barry Megdal
 

Reposting from a few months ago:

 

I posted this long ago when I was using a 1200 as a “portable” mount.  Since then I have a 1600 mount in an observatory.

But I recently received the very impressive Mach 2 which I intend to transport on occasion.

 

So what type of case to use for the mount and its accessories has come up again.  Below is a picture of the case I made for the 1200 counterweight shaft (and will shorten for the Mach 2 shaft).

 

It is made from readily available 2” Schedule 80 PVC pipe parts glued together.  The counterweight shaft is an almost airtight fit inside that size pipe, and the screw-on cap is very convenient.

 

Put a small piece of foam in the bottom and it is ready to go.

 

 

 

 

Dr. Barry Megdal

 

President

Shb Instruments, Inc.

19215 Parthenia St.  Suite A

Northridge, CA 91324

www.shbinstruments.com

(818) 773-2000  (818)773-2005 fax

bmegdal@...

 

Faculty (retired)

Dept. of Electrical Engineering

Caltech

 


Re: DEC Crosstalk

Clayton Yendrey
 

Brian,
I do understand that, but although I leave the mount on the pier in the backyard, I do not leave the OTA there.  For safe carrying, I have a D plate handle assembly; to use it I remove the guide camera/scope from the top D plate and install the handle to carry the OTA safely/securely.  Since I am 'disturbing' the guide scope assembly each time I mount/dismount the OTA, I perform a calibration.  On the few times I've actually had back to back viewing nights, I have left the OTA on the mount and have not recalibrated.


Re: DEC Crosstalk

Clayton Yendrey
 

Roland,
Thanks for the excellent explanation of what happens.  That would explain, I believe, the appearance of large RA spikes literally out of nowhere.  It would seem that the bearing mount/assembly, besides lacking preload, could also be insufficiently rigid as a contributing factor?

This problem is more prevalent/larger magnitude when the mount pointing at high declinations.  It was around 3 hrs before meridian flip on the target (M51).  No spikes readily apparent when guiding at Dec 0/10 minutes west of meridian but began occurring immediately after slewing to target (M51).


Re: DEC Crosstalk

 

>>> other than indicating that I don't always have the axis of the guide camera aligned with the axis of the mount movement.  I typically try to adjust/make it perpendicular on the next calibration.  In this instance it was about (going by memory) about 3dg tilt.

two things

first you do not need to do this. that is the purpose of the calibration

second, if you adjust it after calibration, that invalidates the calibration

All you need to do is calibrate and leave it alone



On Wed, May 12, 2021 at 2:33 PM Clayton Yendrey <cyendrey@...> wrote:

Ortho looked good, always has with this mount - other than indicating that I don't always have the axis of the guide camera aligned with the axis of the mount movement.  I typically try to adjust/make it perpendicular on the next calibration.  In this instance it was about (going by memory) about 3dg tilt.

To be clear, this is NOT an AP mount that I'm working with at the moment.  A comment was made about this being a general issue with GEM mounts by the Support for that mount.  Since I don't see/haven't found many/any discussions about DEC causing spike (crosstalk) in the RA across several different internet searches, I thought I'd ask the other manufacturers support directly.  Of course, doesn't hurt that I only have 22 months to go on my Mach2 waiting list...   



--
Brian 



Brian Valente


Re: DEC Crosstalk

Clayton Yendrey
 

Ortho looked good, always has with this mount - other than indicating that I don't always have the axis of the guide camera aligned with the axis of the mount movement.  I typically try to adjust/make it perpendicular on the next calibration.  In this instance it was about (going by memory) about 3dg tilt.

To be clear, this is NOT an AP mount that I'm working with at the moment.  A comment was made about this being a general issue with GEM mounts by the Support for that mount.  Since I don't see/haven't found many/any discussions about DEC causing spike (crosstalk) in the RA across several different internet searches, I thought I'd ask the other manufacturers support directly.  Of course, doesn't hurt that I only have 22 months to go on my Mach2 waiting list...   


Re: Dual scope setup question

Worsel
 

Yanzhe

There was a short thread on the dual scope topic back in March.  In fact, it was specific to the 1100, so you may find useful info at
https://ap-gto.groups.io/g/main/topic/81188350#76876

Bryan


Re: Dual scope setup question

Bruce Donzanti
 

I have an 80mm piggybacked on top of my C11" on my AP1100.  Cameras on both with filter wheels and auto-focusers 7 USB ports.  I use to guide the 80mm with the OAG on the C11 and that works most of the time.  However, during windy nights it could struggle so I placed a second OAG on the 80mm and it works fine all of the time.  


Re: Dual scope setup question

Kent Kirkley
 

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



Dual scope setup question

yanzhe liu
 

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: APCC pro refraction modeling for nomad setup #Mach2GTO #APCC

Andrea Lucchetti
 

thank you everyone.
I need to be quicker in setting up the rig: my last night out was in November and this doesn't allow me to build a routine...
in the future I'd like to run a small model before imaging, but for now I like the trick suggested by Ray.
I am curious to see how long unguided I can go, with a mach 2 polar aligned on the refracted pole and refraction keyed in.
andrea


Re: DEC Crosstalk

Roland Christen
 

Typically, crosstalk occurs when the Dec axis is moved slightly during guiding, and this causes a corresponding Ra movement. It typically happens when the scope is pointed toward the meridian (sometimes from zenith to the pole). The wiping action of the Dec worm against the Dec worm wheel causes the wheel to lift slightly if the Dec bearings are not highly pre-loaded. The entire worm wheel and shaft will tilt slightly back and forth as the worm gear turns in the worm wheel teeth. It's caused by friction of the worm teeth against the worm gear. This slight tilting is in the direction of RA but cannot be seen as an RA shaft motion.

Rolando

-----Original Message-----
From: Brian Valente <bvalente@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 3:05 pm
Subject: Re: [ap-gto] DEC Crosstalk

Hi Clayton
>>>I'm trying to get some idea/context for the issue of DEC crosstalk to the RA axis during tracking/guiding.

How does the orthagonality of your guiding calibration look? if it's not at 90 degrees, that would cause mirroring between the axis



On Wed, May 12, 2021 at 12:59 PM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:
I have never seen it in any of our present mounts. It can happen if the Dec main bearings are not fully pre-loaded.

Rolando


-----Original Message-----
From: Clayton Yendrey <cyendrey@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 2:46 pm
Subject: [ap-gto] DEC Crosstalk

I'm trying to get some idea/context for the issue of DEC crosstalk to the RA axis during tracking/guiding.  I see this as a topic that seems to come with different users in the Paramount forums almost continuously - in other words while user may/may not get it resolved with adjustments to worm engagement, there is usually someone else that will have a similar issue shortly, so there is never an true absence of problems being reported.  I did not see this reported as an stand alone issue when I had an EQ6R, nor when I had an Ioptron GEM45 in those respective user groups.
I'm not saying it doesn't occur, but I can't remember a specific case of someone reporting this particular issue in the AP-GTO groups.  I've seen it stated on a few occasions in the Paramount forums that all GEM mounts are subject to this problem (with the sub text that there isn't a problem with the Paramount's design).  I'm not asking about the Paramounts (although I have one while waiting for my turn at a Mach2).  
What I'm trying to gauge the accuracy of is the generalization from them that this is just something that GEM mounts have and users just need to deal with it.  Seems if that was the case, it would tend to be more visible in other forums?  So is this something that is inherent to GEM mounts / AP mounts and how prevalent is it/how is it dealt with?
 
Thanks in advance,
Clayton

--
Roland Christen
Astro-Physics


--
Brian 



Brian Valente

--
Roland Christen
Astro-Physics


Re: DEC Crosstalk

 

Hi Clayton
>>>I'm trying to get some idea/context for the issue of DEC crosstalk to the RA axis during tracking/guiding.

How does the orthagonality of your guiding calibration look? if it's not at 90 degrees, that would cause mirroring between the axis



On Wed, May 12, 2021 at 12:59 PM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:
I have never seen it in any of our present mounts. It can happen if the Dec main bearings are not fully pre-loaded.

Rolando


-----Original Message-----
From: Clayton Yendrey <cyendrey@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 2:46 pm
Subject: [ap-gto] DEC Crosstalk

I'm trying to get some idea/context for the issue of DEC crosstalk to the RA axis during tracking/guiding.  I see this as a topic that seems to come with different users in the Paramount forums almost continuously - in other words while user may/may not get it resolved with adjustments to worm engagement, there is usually someone else that will have a similar issue shortly, so there is never an true absence of problems being reported.  I did not see this reported as an stand alone issue when I had an EQ6R, nor when I had an Ioptron GEM45 in those respective user groups.
I'm not saying it doesn't occur, but I can't remember a specific case of someone reporting this particular issue in the AP-GTO groups.  I've seen it stated on a few occasions in the Paramount forums that all GEM mounts are subject to this problem (with the sub text that there isn't a problem with the Paramount's design).  I'm not asking about the Paramounts (although I have one while waiting for my turn at a Mach2).  
What I'm trying to gauge the accuracy of is the generalization from them that this is just something that GEM mounts have and users just need to deal with it.  Seems if that was the case, it would tend to be more visible in other forums?  So is this something that is inherent to GEM mounts / AP mounts and how prevalent is it/how is it dealt with?
 
Thanks in advance,
Clayton

--
Roland Christen
Astro-Physics



--
Brian 



Brian Valente

4621 - 4640 of 83123