Re: [ap-gto] 2-star calibration without keypad possible?


Apr 28, 2010

 


----------------------------

#27639 Apr 28, 2010

Hello!



I was wondering if it is possible to somehow calibrate a AP 1200GTO by using the computer/driver (without using the keypad)?



Point is: I want to use the telescope remotely and sure, the first calibration can be done with the keypad on location. But if later on s.th. goes wrong and I can't go there - is there some way to do for example a 2-star calibration by using the N E S W buttons of the driver (AstroPhysics V2 driver)?

Or any other possibility?



Best regards,

Agnes



----------------------------

#27650 Apr 29, 2010

Hi Agnes,







YES!! You do not even need to have the keypad connected to the mount.

In fact, if I were operating a mount remotely, I would probably have the

keypad safely wrapped up and stored away in a box where it could suffer

no damage from the elements. If the ASCOM V2 driver detects that your

GTOCP3 has not yet been initialized, it will initialize the mount using

the parameters you have set in the driver.







Mag. 7 skies!







Howard Hedlund



Astro-Physics, Inc.



815-282-1513



---------------



From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On Behalf

Of squatina23

Sent: Wednesday, April 28, 2010 7:07 PM

To: ap-gto@yahoogroups.com

Subject: [ap-gto] 2-star calibration without keypad possible?











Hello!



I was wondering if it is possible to somehow calibrate a AP 1200GTO by

using the computer/driver (without using the keypad)?



Point is: I want to use the telescope remotely and sure, the first

calibration can be done with the keypad on location. But if later on

s.th. goes wrong and I can't go there - is there some way to do for

example a 2-star calibration by using the N E S W buttons of the driver

(AstroPhysics V2 driver)?

Or any other possibility?



Best regards,

Agnes











[Non-text portions of this message have been removed]



----------------------------

#27653 Apr 29, 2010

The servo location is saved.. You do not have to "park" for the scope to know it's location on power up.

.

Chris





--- On Thu, 4/29/10, Charlie Miller cmiller@...> wrote:





From: Charlie Miller cmiller@...>

Subject: Re: [ap-gto] 2-star calibration without keypad possible?

To: ap-gto@yahoogroups.com

Date: Thursday, April 29, 2010, 11:24 AM





Howard:



I don't understand this answer. If, for example, there were a power

outage at the remote site, Agnes could reconnect after the power comes

back on but the scope would be uninitialized and Agnes would have no way

of knowing where the scope was pointing (RA and DEC) if the power were

off for several hours.



How would you acquire a known target to be used for a sync or

recalibration?





Charlie Miller



On 4/29/2010 9:56 AM, Howard wrote:

>

> Hi Agnes,

>

> YES!! You do not even need to have the keypad connected to the mount.

> In fact, if I were operating a mount remotely, I would probably have the

> keypad safely wrapped up and stored away in a box where it could suffer

> no damage from the elements. If the ASCOM V2 driver detects that your

> GTOCP3 has not yet been initialized, it will initialize the mount using

> the parameters you have set in the driver.

>

> Mag. 7 skies!

>

> Howard Hedlund

>

> Astro-Physics, Inc.

>

> 815-282-1513

>

---------------

>

> From: ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com>

> [mailto:ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com>] On

> Behalf

> Of squatina23

> Sent: Wednesday, April 28, 2010 7:07 PM

> To: ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com>

> Subject: [ap-gto] 2-star calibration without keypad possible?

>

> Hello!

>

> I was wondering if it is possible to somehow calibrate a AP 1200GTO by

> using the computer/driver (without using the keypad)?

>

> Point is: I want to use the telescope remotely and sure, the first

> calibration can be done with the keypad on location. But if later on

> s.th. goes wrong and I can't go there - is there some way to do for

> example a 2-star calibration by using the N E S W buttons of the driver

> (AstroPhysics V2 driver)?

> Or any other possibility?

>

> Best regards,

> Agnes

>

> [Non-text portions of this message have been removed]

>

>







---------------



To UNSUBSCRIBE, or for general information on the ap-gto list

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[Non-text portions of this message have been removed]







----------------------------

#27655 Apr 29, 2010

In a message dated 4/28/2010 7:09:56 PM Central Daylight Time,

agnes_grossmann@... writes:



> I was wondering if it is possible to somehow calibrate a AP 1200GTO by

> using the computer/driver (without using the keypad)?

>

> Point is: I want to use the telescope remotely and sure, the first

> calibration can be done with the keypad on location. But if later on s.th. goes

> wrong and I can't go there - is there some way to do for example a 2-star

> calibration by using the N E S W buttons of the driver (AstroPhysics V2

> driver)?

> Or any other possibility?

>



If you are in a permanent setup you never have to do any sort of 2 star

calibration. The reason to use 2 stars is for mechanical polar alignment, which

I presume is already finished for a permanent remote setup.



Rolando





[Non-text portions of this message have been removed]



----------------------------

#27659 Apr 29, 2010

Howard:



I guess I did not read the fine print! I did not know the GTOCPx

software was able to save the servo motor positions at power down and

recover them during power up. Clearly that solves a host of problems.



Charlie Miller



On 4/29/2010 10:48 AM, Howard wrote:

>

> Hi Charlie (and Agnes and everybody)

>

> This is the magic of the AP GTO system. The GTOCPx control boxes (all

> of them) store just enough reserve power to write some critical

> information to the servo memory when power is removed. As soon as the

> control box detects that power is removed, it writes this information to

> memory. It is automatic. The information that is written is the time,

> location, pointing position and the precise gear angles associated with

> the pointing position. In reality, a sudden unintended power

> interruption is the same as simply pulling the plug to "autopark" as

> described in the keypad manual. As we have repeated many times, you DO

> NOT need to officially park and Astro-Physics GTO mount!

>

> When you or Agnes or anyone else powers the mount back up after a power

> interruption, you initialize the mount by giving it the location data

> and the current time and date. Since the servo knows exactly where it

> was and the exact time of the power interruption, it does some basic

> arithmetic and calculates exactly where its current pointing position

> is. There is no sync or recalibration required.

>

> The next time I go to a star party, I will announce a demonstration of

> this. If anyone is interested, we will have a set time where you can

> all show up at my campsite. I will then pull the plug in mid slew, and

> we can all take a nice walk to the coffee tent for a beverage. We'll

> check out a few other scopes on the way back to allow some time to pass,

> and then I will fire the mount up and go to an object.

>

> Mag. 7 skies!

>

> Howard Hedlund

> Astro-Physics, Inc.

> 815-282-1513

>

> -----Original Message-----

> From: ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com>

> [mailto:ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com>] On

> Behalf

> Of Charlie Miller

> Sent: Thursday, April 29, 2010 10:24 AM

> To: ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com>

> Subject: Re: [ap-gto] 2-star calibration without keypad possible?

>

> Howard:

>

> I don't understand this answer. If, for example, there were a power

> outage at the remote site, Agnes could reconnect after the power comes

> back on but the scope would be uninitialized and Agnes would have no way

>

> of knowing where the scope was pointing (RA and DEC) if the power were

> off for several hours.

>

> How would you acquire a known target to be used for a sync or

> recalibration?

>

> Charlie Miller

>

> On 4/29/2010 9:56 AM, Howard wrote:

> >

> > Hi Agnes,

> >

> > YES!! You do not even need to have the keypad connected to the mount.

> > In fact, if I were operating a mount remotely, I would probably have

> the

> > keypad safely wrapped up and stored away in a box where it could

> suffer

> > no damage from the elements. If the ASCOM V2 driver detects that your

> > GTOCP3 has not yet been initialized, it will initialize the mount

> using

> > the parameters you have set in the driver.

> >

> > Mag. 7 skies!

> >

> > Howard Hedlund

> >

> > Astro-Physics, Inc.

> >

> > 815-282-1513

> >

---------------

> >

> > From: ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com>

> mailto:ap-gto%40yahoogroups.com>

> > [mailto:ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com>

> mailto:ap-gto%40yahoogroups.com>] On

> > Behalf

> > Of squatina23

> > Sent: Wednesday, April 28, 2010 7:07 PM

> > To: ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com>

> mailto:ap-gto%40yahoogroups.com>

> > Subject: [ap-gto] 2-star calibration without keypad possible?

> >

> > Hello!

> >

> > I was wondering if it is possible to somehow calibrate a AP 1200GTO by

> > using the computer/driver (without using the keypad)?

> >

> > Point is: I want to use the telescope remotely and sure, the first

> > calibration can be done with the keypad on location. But if later on

> > s.th. goes wrong and I can't go there - is there some way to do for

> > example a 2-star calibration by using the N E S W buttons of the

> driver

> > (AstroPhysics V2 driver)?

> > Or any other possibility?

> >

> > Best regards,

> > Agnes

> >

> > [Non-text portions of this message have been removed]

> >

> >

>

---------------

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gtoYahoo

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>

>







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