PEC


Astrobob
 

Hi all,
I have a 2010 AP1200+GTO-CP3+Key Pad (Set for external control)+AP V2 driver.
I used the keypad to do a PEC run but in the AP V2 setup you get a choice of turning the PEC on or off. What is the purpose of that? Also, My telescope has a 2200mm focal length. What is the best guide rate?
Can I use the guiders in software such as MaxIm Dl or CCDSoftv5 while doing a PEC run or is a crosshair eyepiece better?
Thanks,
Bob


Roland Christen
 


Can I use the guiders in software such as MaxIm Dl or CCDSoftv5 while doing a PEC run
Yes, you can use guider software to do a PE run. Make sure you have a stable night and low moment to moment guide error. If you have any sudden excursions such as a cosmic ray hit, that excursion will be dutifully recorded and gets played back every worm cycle.

Rolando


-----Original Message-----
From: imager1940@... [ap-gto]
To: ap-gto
Sent: Thu, May 2, 2019 10:53 am
Subject: [ap-gto] PEC



Hi all,
I have a 2010 AP1200+GTO-CP3+Key Pad (Set for external control)+AP V2 driver.
I used the keypad to do a PEC run but in the AP V2 setup you get a choice of turning the PEC on or off. What is the purpose of that? Also, My telescope has a 2200mm focal length. What is the best guide rate?
Can I use the guiders in software such as MaxIm Dl or CCDSoftv5 while doing a PEC run or is a crosshair eyepiece better?
Thanks,
Bob



Astrobob
 

And how about suggestions pertaining to the following:

I have a 2010 AP1200+GTO-CP3+Key Pad (Set for external control)+AP V2 driver.
I used the keypad to do a PEC run but in the AP V2 setup you get a choice of turning the PEC on or off. What is the purpose of that? Also, My telescope has a 2200mm focal length. What is the best guide rate? 

Thanks,
Bob


Roland Christen
 

Best guide rate is always 1x sidereal.

Roland



-----Original Message-----
From: imager1940@... [ap-gto]
To: ap-gto
Sent: Thu, May 2, 2019 7:49 pm
Subject: Re: [ap-gto] PEC



And how about suggestions pertaining to the following:

I have a 2010 AP1200+GTO-CP3+Key Pad (Set for external control)+AP V2 driver.
I used the keypad to do a PEC run but in the AP V2 setup you get a choice of turning the PEC on or off. What is the purpose of that? Also, My telescope has a 2200mm focal length. What is the best guide rate? 

Thanks,
Bob



Astrobob
 

Thank you Roland, 
Last 2 questions: What PEC setting would I use in the AP V2 driver (on or off) since I'm using my keypad (set for external control) to record the PEC? I guess I need to know what that AP V2 setting is for. 
Thanks again, 
Bob


Roland Christen
 

You can turn PE correction on with keypad or the driver. Whatever the last one sent the command, that's the one that will function for the imaging session. If you are always starting with the AP driver, then set it to on and forget about any setting in the keypad.

Roland



-----Original Message-----
From: imager1940@... [ap-gto]
To: ap-gto
Sent: Thu, May 2, 2019 8:05 pm
Subject: Re: [ap-gto] PEC



Thank you Roland, 
Last 2 questions: What PEC setting would I use in the AP V2 driver (on or off) since I'm using my keypad (set for external control) to record the PEC? I guess I need to know what that AP V2 setting is for. 
Thanks again, 
Bob



Roland Christen
 

You can turn PE correction on with keypad or the driver. Whatever the last one sent the command, that's the one that will function for the imaging session. If you are always starting with the AP driver, then set it to on and forget about any setting in the keypad.

Roland



-----Original Message-----
From: imager1940@... [ap-gto]
To: ap-gto
Sent: Thu, May 2, 2019 8:05 pm
Subject: Re: [ap-gto] PEC



Thank you Roland, 
Last 2 questions: What PEC setting would I use in the AP V2 driver (on or off) since I'm using my keypad (set for external control) to record the PEC? I guess I need to know what that AP V2 setting is for. 
Thanks again, 
Bob




Ray Gralak
 

Hi Bob,

By default after power on the mount will have PEC disabled. If you initialize the mount with the AP V2 driver you have the option of automatically turning it on when you connect to the mount.

You would turn PEC off if you want to measure the uncorrected periodic error of the mount.

You will want to select PEC Record to record the periodic error. Keep in mind that the periodic error will not likely be smooth because of stellar scintillation and it will also be phase shifted by the sum of the duration of each exposure and the time for the autoguiding program to calculate and send an autoguiding pulse.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

-----Original Message-----
From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
Sent: Thursday, May 2, 2019 8:51 AM
To: ap-gto@yahoogroups.com
Subject: [ap-gto] PEC



Hi all,
I have a 2010 AP1200+GTO-CP3+Key Pad (Set for external control)+AP V2 driver.
I used the keypad to do a PEC run but in the AP V2 setup you get a choice of turning the PEC on or off. What is the
purpose of that? Also, My telescope has a 2200mm focal length. What is the best guide rate?
Can I use the guiders in software such as MaxIm Dl or CCDSoftv5 while doing a PEC run or is a crosshair eyepiece
better?
Thanks,
Bob



Astrobob
 

Hi Ray,

Just to be sure I understand.
I do not use PemPro on this mount. I used the keypad to record a PEC but I control my AP1200 with AP V2  driver. So do I leave the PEC in the driver on or off? I assume that I leave it on since I'm using a computer to control the mount. 

Thanks to you and Roland for your great products and patience, 
Bob


Ray Gralak
 

Hi Bob,

Just to be sure I understand.
I do not use PemPro on this mount. I used the keypad to record a PEC but I control my AP1200 with AP V2 driver.
So do I leave the PEC in the driver on or off? I assume that I leave it on since I'm using a computer to control the
mount.
All of my comments were based on not using PEMPro.

It doesn't matter if you turn PEC "on" in the driver or the hand controller. Both can tell the control box to enable PEC. The last command sent is what the control box will use.

BTW, PEC is called "PEM" on Astro-Physics mounts.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver


-----Original Message-----
From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
Sent: Friday, May 3, 2019 7:31 PM
To: ap-gto@yahoogroups.com
Subject: RE: [ap-gto] PEC



Hi Ray,

Just to be sure I understand.
I do not use PemPro on this mount. I used the keypad to record a PEC but I control my AP1200 with AP V2 driver.
So do I leave the PEC in the driver on or off? I assume that I leave it on since I'm using a computer to control the
mount.

Thanks to you and Roland for your great products and patience,
Bob


Astrobob
 

Got it!
Thank you Ray. 
Bob