Date   

Re: Power connector 900GTO

Michael Hambrick <mike.hambrick@...>
 

Hi Kevin

I think Astro-Physics makes most of their own cables. You might be able to get them to make a modified version of the CABLPF to put whatever kind of connectors you want on the end. I like the Anderson Powerpole connectors that they use on their 1100GTO mount power cables. If you go this way you will also need a short adaptor cable with ring connections on one end to connect to your power supply.


Best Regards

Michael Hambrick
ARLANXEO
TSR Global Manufacturing Support
PO Box 2000
Orange, TX 77631-2000
Phone: +1 (409) 882-2799
email: mike.hambrick@...


Re: Power connector 900GTO

KHursh
 

I think that is the most straightforward way. Thanks Mike.


Re: Power connector 900GTO

KHursh
 

I'm sorry. I should have specified. I got the powerwerx sps-30dm with binding posts, not the PowerPole connectors.


Re: Power connector 900GTO

Mike Dodd
 

On 8/7/2020 10:35 PM, khursh via groups.io wrote:
First, the good news - I'm picking up a new-to-me 900GTO CP3 tomorrow.
Congrats! I hope you put it to good use.

How does one connect the CABLPF that is
connected to the mount to the power supply? A cigarette lighter to ring
or horseshoe clip?
I think the Powerwerx supply has 1/4" binding terminals on the rear.

And the AP900 power cord has a cigarette lighter plug on it? CUT IT OFF!

I strongly recommend AGAINST using a cigarette lighter plug/socket for anything. I've had these go flaky in the past, as the metal contacts accumulate crud.

Strip the insulation from the ends of the power wires, then install crimp-on ring terminals on the wires. Be sure to mark which one is positive (red) and which is negative (black).

You can get crimp-on terminals at hardware stores and auto supply stores, as well as a crimping tool.

--- Mike


Re: Power connector 900GTO

Bill Long
 

You can just use something like this:


It wont thread on like the stock one though. You could also use this:





From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of khursh via groups.io <khursh@...>
Sent: Friday, August 7, 2020 7:35 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: [ap-gto] Power connector 900GTO
 
First, the good news - I'm picking up a new-to-me 900GTO CP3 tomorrow. I got the Powerwerx 30A power supply to go with it (probably overkill). I have a rather dumb question. How does one connect the CABLPF that is connected to the mount to the power supply? A cigarette lighter to ring or horseshoe clip?
TIA

Kevin


Power connector 900GTO

KHursh
 

First, the good news - I'm picking up a new-to-me 900GTO CP3 tomorrow. I got the Powerwerx 30A power supply to go with it (probably overkill). I have a rather dumb question. How does one connect the CABLPF that is connected to the mount to the power supply? A cigarette lighter to ring or horseshoe clip?
TIA

Kevin


Re: Tracking issues with AP900

Roland Christen
 

The thing that is puzzling is that when imaging unguided there is Dec drift, yet when he measured the drift there is no Dec drift in 7 minutes (ignore RA drift for the moment). There is no known mechanism that can cause short term Dec drift (2 minutes to 7 minutes) except polar misalignment. Mirror flop generally acts in the RA direction as the scope slowly moves from east to west, but even in RA it doesn't move rapidly in 60 seconds. Nothing else really causes Dec drift of such short term duration.

RA can be much more easily explained. You have periodic error which is not drift, but acts somewhat analogous to drift. You have true drift due to polar misalignment. You have drift caused by atmospheric refraction, even with perfect polar alignment.

Dec drift is easy to eliminate in most quadrants of the sky because the Dec axis does not move, and thus can be adjusted via the altitude and azimuth axes. RA drift cannot be so easily removed by drift alignment and is always the bulk of the problem.

Rolando




-----Original Message-----
From: Charles Thompson via groups.io <cthomp97@...>
To: main@ap-gto.groups.io
Sent: Fri, Aug 7, 2020 6:48 pm
Subject: Re: [ap-gto] Tracking issues with AP900

Maybe something got bumped... I've done it unknowingly.





Thanks,
Charles

Sent from mobile device.


-------- Original message --------
From: "uncarollo2 <chris1011@...> via groups.io" <chris1011@...>
Date: 8/7/20 6:33 PM (GMT-06:00)
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Tracking issues with AP900


When I did my drift alignment with a high power illuminated eyepiece in the imaging scope I had zero drift in both axis for 7 minutes.
You did drift alignment for 7 minutes with no drift. So theoretically you should be able to attach a camera and get zero drift with the camera, and thus by definition you will get perfectly round stars in a 7 minute exposure. So, where is the problem?

Basically there is no information in your response below.
Where was the drift alignment done where you got 7 minutes without any drift?
Was drift alignment not done in the south? That is where drift alignment is normally done, scope pointing due south near the meridian.

Rolando



-----Original Message-----
From: Chanan Greenberg <chanan2009@...>
To: main@ap-gto.groups.io
Sent: Fri, Aug 7, 2020 3:08 pm
Subject: Re: [ap-gto] Tracking issues with AP900

Hi Rolando,

Really appreciate the effort to help. Just as a backdrop, I have been doing astrophotography and drift alignment for 12+ years. 
When I did my drift alignment with a high power illuminated eyepiece in the imaging scope I had zero drift in both axis for 7 minutes. This is why I do not believe this has anything to do with polar alignment. Even with poor polar alignment an AP900 should be able to track stars well without auto-guiding for several minutes. 
I am able to get that performance in any direction I point with the exception of pointing south. There it seems to be unable to track for even 30 seconds without drifting in both RA and DEC. 

Which is why i suspect - balance, flexure, mirror flop or something wrong with the mount itself.

Hope this is more complete info.

Thanks
Chanan


Re: Tracking issues with AP900

Charles Thompson
 

Maybe something got bumped... I've done it unknowingly.





Thanks,
Charles

Sent from mobile device.


-------- Original message --------
From: "uncarollo2 <chris1011@...> via groups.io" <chris1011@...>
Date: 8/7/20 6:33 PM (GMT-06:00)
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Tracking issues with AP900


When I did my drift alignment with a high power illuminated eyepiece in the imaging scope I had zero drift in both axis for 7 minutes.
You did drift alignment for 7 minutes with no drift. So theoretically you should be able to attach a camera and get zero drift with the camera, and thus by definition you will get perfectly round stars in a 7 minute exposure. So, where is the problem?

Basically there is no information in your response below.
Where was the drift alignment done where you got 7 minutes without any drift?
Was drift alignment not done in the south? That is where drift alignment is normally done, scope pointing due south near the meridian.

Rolando



-----Original Message-----
From: Chanan Greenberg <chanan2009@...>
To: main@ap-gto.groups.io
Sent: Fri, Aug 7, 2020 3:08 pm
Subject: Re: [ap-gto] Tracking issues with AP900

Hi Rolando,

Really appreciate the effort to help. Just as a backdrop, I have been doing astrophotography and drift alignment for 12+ years. 
When I did my drift alignment with a high power illuminated eyepiece in the imaging scope I had zero drift in both axis for 7 minutes. This is why I do not believe this has anything to do with polar alignment. Even with poor polar alignment an AP900 should be able to track stars well without auto-guiding for several minutes. 
I am able to get that performance in any direction I point with the exception of pointing south. There it seems to be unable to track for even 30 seconds without drifting in both RA and DEC. 

Which is why i suspect - balance, flexure, mirror flop or something wrong with the mount itself.

Hope this is more complete info.

Thanks
Chanan


Re: Tracking issues with AP900

Roland Christen
 


When I did my drift alignment with a high power illuminated eyepiece in the imaging scope I had zero drift in both axis for 7 minutes.
You did drift alignment for 7 minutes with no drift. So theoretically you should be able to attach a camera and get zero drift with the camera, and thus by definition you will get perfectly round stars in a 7 minute exposure. So, where is the problem?

Basically there is no information in your response below.
Where was the drift alignment done where you got 7 minutes without any drift?
Was drift alignment not done in the south? That is where drift alignment is normally done, scope pointing due south near the meridian.

Rolando



-----Original Message-----
From: Chanan Greenberg <chanan2009@...>
To: main@ap-gto.groups.io
Sent: Fri, Aug 7, 2020 3:08 pm
Subject: Re: [ap-gto] Tracking issues with AP900

Hi Rolando,

Really appreciate the effort to help. Just as a backdrop, I have been doing astrophotography and drift alignment for 12+ years. 
When I did my drift alignment with a high power illuminated eyepiece in the imaging scope I had zero drift in both axis for 7 minutes. This is why I do not believe this has anything to do with polar alignment. Even with poor polar alignment an AP900 should be able to track stars well without auto-guiding for several minutes. 
I am able to get that performance in any direction I point with the exception of pointing south. There it seems to be unable to track for even 30 seconds without drifting in both RA and DEC. 

Which is why i suspect - balance, flexure, mirror flop or something wrong with the mount itself.

Hope this is more complete info.

Thanks
Chanan


Re: Tracking issues with AP900

Christopher Erickson
 

If I were having this problem, here is what I would probably do, in rough order...

1. Replace the ancient CP1 with a CP4, if possible. Get atmospheric refraction correction and a bunch of other new and cool functionalities.
2. Check RA axis backlash and axis balance. If your backlash has loosened up over time and the mount is very closely balanced and the worm lube is very dry, the scope could be "bouncing along in the backlash." Make the mount more imbalanced to "wrap up the backlash." This is usually more noticeable near the West and East horizons. Not so much close to the North or South horizons. Still worth checking.
3. Triple-check all of the optical train bits for something loose and flexing/sagging/shifting.  Especially focusers and all set screws and lock screws.
4. Triple-check the polar alignment using the drift method in SharpCap.
5. Carefully re-lube both axis worm drive assemblies and carefully tune the worm mesh/backlash afterwards.
6. Always use on-axis or off-axis guiding, never piggyback guiding. Piggyback guiding only leads to tears. Especially with compound scopes with floating optical elements.
7. Check for loose or broken bolts and knobs on the mount and dovetail bars/brackets/saddles.
8. If this scope is accessible by multiple users, take NOTHING for granted. Check EVERYTHING. Especially the DEC axis disassembly/assembly dovetail lock knobs.
9. When in the Northern hemisphere and observing things near the Southern horizon, the OTA is tipped a considerable amount on its side from the DEC axis. A slightly-loose dovetail lock knob could wreak havoc. Not to mention putting the OTA and cameras in great jeopardy.

I hope this helps.


On Fri, Aug 7, 2020 at 10:08 AM Chanan Greenberg <chanan2009@...> wrote:
Hi Rolando,

Really appreciate the effort to help. Just as a backdrop, I have been doing astrophotography and drift alignment for 12+ years. 
When I did my drift alignment with a high power illuminated eyepiece in the imaging scope I had zero drift in both axis for 7 minutes. This is why I do not believe this has anything to do with polar alignment. Even with poor polar alignment an AP900 should be able to track stars well without auto-guiding for several minutes. 
I am able to get that performance in any direction I point with the exception of pointing south. There it seems to be unable to track for even 30 seconds without drifting in both RA and DEC. 

Which is why i suspect - balance, flexure, mirror flop or something wrong with the mount itself.

Hope this is more complete info.

Thanks
Chanan


Re: Tracking issues with AP900

Chanan Greenberg
 

Hi Rolando,

Really appreciate the effort to help. Just as a backdrop, I have been doing astrophotography and drift alignment for 12+ years. 
When I did my drift alignment with a high power illuminated eyepiece in the imaging scope I had zero drift in both axis for 7 minutes. This is why I do not believe this has anything to do with polar alignment. Even with poor polar alignment an AP900 should be able to track stars well without auto-guiding for several minutes. 
I am able to get that performance in any direction I point with the exception of pointing south. There it seems to be unable to track for even 30 seconds without drifting in both RA and DEC. 

Which is why i suspect - balance, flexure, mirror flop or something wrong with the mount itself.

Hope this is more complete info.

Thanks
Chanan


Re: Tracking issues with AP900

Roland Christen
 

If you are getting no drift in your imaging scope then you are getting round stars. No drift means round stars.

So, below you say you get drift pointing south, then that means you are getting drift. And that can mean your polar alignment is not correct.

You also have to understand that there are two axes, RA and DEC. Which axis is drifting when pointing south? If the Dec axis is drifting, your azimuth axis is off. If the RA axis is drifting, the altitude axis is off.

Information is your friend. The more you can share, the easier it is to figure out the issue.

Rolando



-----Original Message-----
From: Chanan Greenberg <chanan2009@...>
To: main@ap-gto.groups.io
Sent: Fri, Aug 7, 2020 2:41 pm
Subject: Re: [ap-gto] Tracking issues with AP900

The imaging scope the C9.25.
I will check my drift again tonight maybe PoleAlignMax was giving me inaccurate data.

Question - if I am getting no drift pointing north, or east or west and only getting drift when pointing south - is it likely a drift issue?


Re: Tracking issues with AP900

Chanan Greenberg
 

The imaging scope the C9.25.
I will check my drift again tonight maybe PoleAlignMax was giving me inaccurate data.

Question - if I am getting no drift pointing north, or east or west and only getting drift when pointing south - is it likely a drift issue?


Re: Tracking issues with AP900

Roland Christen
 

With what scope did you have no drift period? Guide scope or imaging scope?

Rolando



-----Original Message-----
From: Chanan Greenberg <chanan2009@...>
To: main@ap-gto.groups.io
Sent: Fri, Aug 7, 2020 1:27 pm
Subject: Re: [ap-gto] Tracking issues with AP900

I had no drift period
This is what is throwing me off. 


Re: LMFHDT-AP question

Shailesh Trivedi
 

Thank you, Chris.

Shailesh


Re: Tracking issues with AP900

Chanan Greenberg
 

I had no drift period
This is what is throwing me off. 


Re: Pier flip before meridian crossing is not possible with SGP and Mach1

Leo Shatz
 
Edited

Ray, thank for the helpful video link.
 
In the past I haven't set the "Enable East" limits since I'm using SGP Pro and APCC warns against using this checkbox when using external control software such as SGP. Enabling this option has fixed the auto flip problem (still limited to time after meridian crossing). It worked for me in all my imaging sessions in the past without this checkbox being enabled (but I didn't use any limits).
 
I've followed your video, including enabling East Limits, copied East limits to West, but SGP categorically rejects flip as shown in attached screenshot displaying this error message:
 
"Cannot Run Meridian Flip: 
- Telescope must be pointed across the meridian to pier flip."

I'm using APCC 1.8.4.1 and Ascom driver v5.3.10. Firmware version is VCP4-P01-13

 
Thanks,
 
Leo


Re: Tracking issues with AP900

Roland Christen
 

If you get 7 minutes of no drift then you will get 7 minutes of perfectly round stars. That is the definition of round stars - no drift. Something you are not telling me. Is the no drift only on one axis and therefore it IS drifting in the other?

Rolando



-----Original Message-----
From: Chanan Greenberg <chanan2009@...>
To: main@ap-gto.groups.io
Sent: Fri, Aug 7, 2020 12:50 pm
Subject: Re: [ap-gto] Tracking issues with AP900

Hi Rolando,

I doubt this is a drift issue. 1) I did Drift alignment and got to 7 minutes of no drift when pointing to a star at the cross section of the meridian and the celestial equator and no drift when pointing to a star in the east. 2) I measured my polar alignment using PoleAlignMax and it showed I was within 7 arc-minutes off the refracted pole which may not be perfect but I have done a lot of imaging with worse alignment.

This is unlikely the reason that I can get 1-2 minutes of perfectly round stars pointing in one direction and get elongated stars and significant drifting when pointing in the other direction. 

Thanks
Chanan


Re: Pier flip before meridian crossing is not possible with SGP and Mach1

Ray Gralak
 

Leo,

Please watch the video and configure APCC appropriately. From your screenshot, you do not have APCC configured correctly to do what you want to do.

I don't know why SGPro would show the behavior you are seeing. The flip points are set in a straightforward way, but make sure you are using APCC 1.8.4.x and AP V2 ASCOM driver 5.30.10.

Thanks,

-Ray Gralak
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Leo Shatz
Sent: Friday, August 7, 2020 8:48 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Pier flip before meridian crossing is not possible with SGP and Mach1

Ray, thanks for the link. I haven't yet looked at it yet (but will do shortly) - since I'm having now more serious issue :
SGP suddenly cannot do any kind of flips (including in position after meridian crossing), i.e. neither auto nor
manual flip works anymore. This is the typical output in SGP log file. I've tried to reboot my PC, tried different
APCC/SGP versions, it just doesn't work.


[08/07/20 18:36:34.542][DEBUG][Sequence Thread][SQ;] Telescope is on the West side of the mount
[08/07/20 18:36:34.543][DEBUG][Sequence Thread][SQ;] Meridian Flip needed, Hour Angle >= Degrees Past To
Flip: 3.97464999999999 >= 3.75
[08/07/20 18:36:34.543][DEBUG][Sequence Thread][SQ;] Running blocking meridian flip...
[08/07/20 18:36:34.543][DEBUG][Main Thread][SQ;] Adding sequence level notification: Running automatic pier
flip...
[08/07/20 18:36:34.547][DEBUG][Sequence Thread][SQ;] Sending Notification: Status - Running automatic pier
flip...
[08/07/20 18:36:34.547][DEBUG][Sequence Thread][SQ;] Handling monitoring event (Good Night System, Status):
(fliptest) Running automatic pier flip...
[08/07/20 18:36:34.547][DEBUG][Sequence Thread][SQ;] GNS: Sent status message to GNS ((fliptest) Running
automatic pier flip...)...
[08/07/20 18:36:34.653][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Starting Meridian Flip Procedure
[08/07/20 18:36:34.653][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Skipping Solve
[08/07/20 18:36:34.653][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Stopping the Auto Guider
[08/07/20 18:36:34.656][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Sending Telescope command to
execute meridian flip
[08/07/20 18:36:34.670][DEBUG][Telescope Thread][SQ;MF;] ASCOM Telescope: Pier side is West
[08/07/20 18:36:34.670][DEBUG][Telescope Thread][SQ;MF;] ASCOM Telescope: attempting pier flip using slew
[08/07/20 18:36:34.720][DEBUG][Telescope Thread][SQ;MF;] Telescope: Slewing to J2000 RA:
14.7536210927312 (14h45m13.04s) Dec: 64.2599136085692 (64°15'35.69")
[08/07/20 18:36:34.720][DEBUG][Telescope Thread][SQ;MF;] Telescope: Slew received J2000 coordinates,
mount requires JNOW, converting...
[08/07/20 18:36:34.721][DEBUG][Telescope Thread][SQ;MF;] Telescope: Slewing to JNOW RA:
14.7606388892779 Dec: 64.1805555555567
[08/07/20 18:36:41.121][DEBUG][Telescope Thread][SQ;MF;] Scope reports it is done with synchronous slew,
verifying...
[08/07/20 18:36:41.153][DEBUG][Telescope Thread][SQ;MF;] Telescope: Slewing has completed
[08/07/20 18:36:41.153][DEBUG][Telescope Thread][SQ;MF;] Telescope: Settling for 5 seconds
[08/07/20 18:36:46.154][DEBUG][Telescope Thread][SQ;MF;] Telescope: Settling has completed
[08/07/20 18:36:46.667][DEBUG][Telescope Thread][SQ;MF;] ASCOM Telescope: Failed to flip because starting
pier side and ending pier side are the same!
[08/07/20 18:36:46.941][DEBUG][Main Thread][SQ;MF;] PopulateDataModel: Transferring view to the data
model...
[08/07/20 18:36:46.952][DEBUG][MF Update Thread][SQ;MF;] Performing serialize...
[08/07/20 18:36:47.168][DEBUG][Telescope Thread][SQ;MF;] Telescope thread is IDLE...
[08/07/20 18:36:47.208][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Telescope command to meridian flip
has completed
[08/07/20 18:36:47.208][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Telescope failed to perform meridian flip
[08/07/20 18:36:47.841][DEBUG][Main Thread][SQ;MF;] Meridian flip was user aborted...
[08/07/20 18:36:47.880][DEBUG][Main Thread][SQ;] Adding sequence level notification: Failed to complete
automatic meridian flip, aborting sequence!
[08/07/20 18:36:47.920][DEBUG][Sequence Thread][SQ;] Sending Notification: Error - Failed to complete
automatic meridian flip, aborting sequence!
[08/07/20 18:36:47.920][DEBUG][Sequence Thread][SQ;] Handling monitoring event (Good Night System, Error):
(fliptest) Failed to complete automatic meridian flip, aborting sequence!
[08/07/20 18:36:47.920][DEBUG][Sequence Thread][SQ;] GNS: Sent error message to GNS ((fliptest) Failed to
complete automatic meridian flip, aborting sequence!)...
[08/07/20 18:36:47.924][DEBUG][Pier Flip Thread][SQ;] Meridian Flip: Procedure complete
[08/07/20 18:36:50.915][DEBUG][Sequence Thread][SQ;] Blocking Pier Flip: Failed to meridian flip, aborting
sequence (True)
[08/07/20 18:36:50.915][DEBUG][Sequence Thread][SQ;] Aborting sequence: Failed to meridian flip
[08/07/20 18:36:50.915][DEBUG][Sequence Thread][SQ;] Set sequence abort
[08/07/20 18:36:50.917][DEBUG][Main Thread][SQ;] Adding sequence level notification: Failed to meridian flip,
aborting sequence.


Re: Tracking issues with AP900

Chanan Greenberg
 

Hi Rolando,

I doubt this is a drift issue. 1) I did Drift alignment and got to 7 minutes of no drift when pointing to a star at the cross section of the meridian and the celestial equator and no drift when pointing to a star in the east. 2) I measured my polar alignment using PoleAlignMax and it showed I was within 7 arc-minutes off the refracted pole which may not be perfect but I have done a lot of imaging with worse alignment.

This is unlikely the reason that I can get 1-2 minutes of perfectly round stars pointing in one direction and get elongated stars and significant drifting when pointing in the other direction. 

Thanks
Chanan

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