On Nov 1, 2019, at 1:09 PM, uncarollo2 <chris1011@...> via Groups.Io <chris1011@...> wrote:



I believe Pole Master works regardless of cone error.

Roland

-----Original Message-----
From: Greg Salyer <astronutcase@...>
To: main <main@ap-gto.groups.io>
Sent: Fri, Nov 1, 2019 11:59 am
Subject: Re: [ap-gto] Orthogonality question

Sounds great. I've never been able to get PoleMaster to work. The best I can do is about 8' off (so I use PEMPro). Do you think it could be because of Cone Error?

 

Greg

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of uncarollo2 <chris1011@...> via Groups.Io
Sent: Friday, November 1, 2019 12:29 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Orthogonality question

 

Cone error correction. There is an easy way to detect it. In this new keypad routine, you simply go to a star on one side of the meridian, center it and press Recal. Then send the mount to a star the other side of the meridian with the same or similar Dec, center it and press Recal. The cone error is extracted and set in the servo. From then on any time you flip sides the cone error will be compensated. The only place where this cannot work is around the poles because it is a physical impossibility.

 

Roland

 

 

 

-----Original Message-----
From: Greg Salyer <astronutcase@...>
To: main <main@ap-gto.groups.io>
Sent: Fri, Nov 1, 2019 11:15 am
Subject: Re: [ap-gto] Orthogonality question

Cone error correction? or detection?

 

Greg

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of uncarollo2 <chris1011@...> via Groups.Io
Sent: Friday, November 1, 2019 12:02 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Orthogonality question

 

We will have a cone error correction in our upcoming keypad software.

 

Roland

 

 

 

-----Original Message-----
From: Greg Salyer <astronutcase@...>
To: main <main@ap-gto.groups.io>
Sent: Fri, Nov 1, 2019 10:14 am
Subject: Re: [ap-gto] Orthogonality question

Another name for orthogonality error is cone error. Site https://www.sharpcap.co.uk/conesharp has a good description of the problem and software to measure it. Apparently some mounts do allow an adjustment to correct for it. If you search for cone error I'm sure you will find more.

 

Greg

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Andrew Jones
Sent: Friday, November 1, 2019 10:16 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Orthogonality question

 

Suresh, I also have a couple of questions about Orthogonality error (OE). I hope you don’t mind me jumping in on this thread.

Can OE lead to issues with Guiding? I have continued to struggle to dial in my guiding and keep the total RMS error below 1.00. It is usually closer to 1.20 arc minutes. I have tried using the PHD2 settings recommended in a previous post by Rolando, and although they did help, I still struggle with guiding my Mach1 with a TEC140 attached (with or without an APPM pointing model). According my PemPro my polar alignment is +/- 2 arc mins. So, I suspect the issue is caused by OE. I am not that familiar with OE or how to correct for it.

 

Is OE something that can be detected by PemPro? It seems like that would be the right tool for the job. My rig is used solely for imaging, so I am looking for an imaging solution to help identify and recommend the OE adjustments that need to be made to correct for it.  I have seen instructions where it ask to point the OTA towards zenith on one side of the pier, then set a 1-hour meridian delay and slew to the same spot on the other side of the pier. The problem I have is that with the TEC140 and my imaging gear, I am almost hitting the pier when the scope is pointed at Zenith. So, setting a 1-hour meridian delay (which I assume means a weights up position) is not really a good option. Finally, is the best option to adjust for OE to put strips of cut up soda cans in the saddle to push the back end of the scope one way or the other? I am surprised someone has not produced a saddle that has OE adjustments built in. The Soda can method does not seem like an easily repeatable process.

 

Anyway, as I have never had to adjust for OE, I am looking for advice on the best way to go about detecting it and then fixing it on the Mach1. Any advice would be greatly appreciated.

Andrew J

Suresh, I also have a couple of questions about Orthogonality error (OE). I hope you don’t mind me jumping in on this thread.

Can OE lead to issues with Guiding? I have continued to struggle to dial in my guiding and keep the total RMS error below 1.00. It is usually closer to 1.20 arc minutes. I have tried using the PHD2 settings recommended in a previous post by Rolando, and although they did help, I still struggle with guiding my Mach1 with a TEC140 attached (with or without an APPM pointing model). According my PemPro my polar alignment is +/- 2 arc mins. So, I suspect the issue is caused by OE. I am not that familiar with OE or how to correct for it.

Is OE something that can be detected by PemPro? It seems like that would be the right tool for the job. My rig is used solely for imaging, so I am looking for an imaging solution to help identify and recommend the OE adjustments that need to be made to correct for it.  I have seen instructions where it ask to point the OTA towards zenith on one side of the pier, then set a 1-hour meridian delay and slew to the same spot on the other side of the pier. The problem I have is that with the TEC140 and my imaging gear, I am almost hitting the pier when the scope is pointed at Zenith. So, setting a 1-hour meridian delay (which I assume means a weights up position) is not really a good option. Finally, is the best option to adjust for OE to put strips of cut up soda cans in the saddle to push the back end of the scope one way or the other? I am surprised someone has not produced a saddle that has OE adjustments built in. The Soda can method does not seem like an easily repeatable process.

Anyway, as I have never had to adjust for OE, I am looking for advice on the best way to go about detecting it and then fixing it on the Mach1. Any advice would be greatly appreciated.

Andrew J

Suresh, I also have a couple of questions about Orthogonality error (OE). I hope you don’t mind me jumping in on this thread.

Can OE lead to issues with Guiding? I have continued to struggle to dial in my guiding and keep the total RMS error below 1.00. It is usually closer to 1.20 arc minutes. I have tried using the PHD2 settings recommended in a previous post by Rolando, and although they did help, I still struggle with guiding my Mach1 with a TEC140 attached (with or without an APPM pointing model). According my PemPro my polar alignment is +/- 2 arc mins. So, I suspect the issue is caused by OE. I am not that familiar with OE or how to correct for it.

Is OE something that can be detected by PemPro? It seems like that would be the right tool for the job. My rig is used solely for imaging, so I am looking for an imaging solution to help identify and recommend the OE adjustments that need to be made to correct for it.  I have seen instructions where it ask to point the OTA towards zenith on one side of the pier, then set a 1-hour meridian delay and slew to the same spot on the other side of the pier. The problem I have is that with the TEC140 and my imaging gear, I am almost hitting the pier when the scope is pointed at Zenith. So, setting a 1-hour meridian delay (which I assume means a weights up position) is not really a good option. Finally, is the best option to adjust for OE to put strips of cut up soda cans in the saddle to push the back end of the scope one way or the other? I am surprised someone has not produced a saddle that has OE adjustments built in. The Soda can method does not seem like an easily repeatable process.

Anyway, as I have never had to adjust for OE, I am looking for advice on the best way to go about detecting it and then fixing it on the Mach1. Any advice would be greatly appreciated.

Andrew J

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Tony Benjamin
Sent: Thursday, October 31, 2019 8:18 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] Help with getting mount (AP 1100GTO) to flip in Voyager

Hi,

While I have been using Voyager successfully for a bit now (thanks Bill :)) I still have not been successful in getting
the mount to flip automatically when reaching the meridian. Can anyone see what may need changing in the
settings I have to get the mount to flip successfully at the meridian?


Thanks

Tony

Hello, I have the AE1100 and am just learning how to use it. I would like to know what I need to do to slew the mount my scope is pointing to the east on an object and with the weights up? Not sure how to ask this question clearly. The problem is if I use my planetarium software to slew to an object that is rising in the east the mount slews so the weights are down, that means when the object crosses the meridian I would have to do pier flip. What I think I can do with this mount is slew to the object but have the weights pointing up, then image all night long without having to do a pier flip, The problem I have is I don't know how to point to the object so the weights would be up, if I slew to the object with the planetarium program it wants to keep the weights down. Am I off the mark trying to do this and should I just settle for a meridian flip?

Thanks
Claude