Re: 1100 GTO guiding prblem.


Sep 27, 2014

 


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

#45197 Sep 27, 2014

I am having problems tracking and guiding with my 1100. I have the V chip. The mount tracks West faster than the sidereal rate. When I try to auto guide the guiding can not overcome the Westward drift. The result is star trails and the object will eventually drift out of the FOV. I can see the auto guider working but it looses the battle. I have tried guiding at 1x to .25x. The results are the same. Ideas please?

Steve



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

#45198 Sep 27, 2014

A bit more information is needed. How areyou guiding, separate guide scope and camera or dual chip (SBIG)? Are you usingan AO unit? Is the N/S switch in the proper position? Have your tried reversingthis? Do you get good star movement when calibrating the guider? What softwareare you using? Is this new or just started? What method are you using, relays,ASCOM Direct, cable, no cable.... ��-Steve ��

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

Sent: Saturday, September 27, 201412:21 PM

To: ap-gto@yahoogroups.com

Subject: [ap-gto] 1100 GTO guidingprblem.

���� I amhaving problems tracking and guiding with my 1100. I have the V chip. The mounttracks West faster than the sidereal rate. When I try to auto guide the guidingcan not overcome the Westward drift. The result is star trails and the objectwill eventually drift out of the FOV. I can see the auto guider working but itlooses the battle. I have tried guiding at 1x to .25x. The results are thesame. Ideas please? ��Steve



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

#45212 Sep 29, 2014

Do you mean that the star is moving west or is the star moving east because the mount is tracking fast. Which one is moving west, mount or star?



Possibilities:



1) wrong polar alignment, altitude axis is too low or too high.

2) the tracking speed is set to Lunar or solar instead of Sidereal. Are you controlling the mount from external software which may be setting the mount to Lunar rate?



Rolando









-----Original Message-----From: swiencek@... [ap-gto] ap-gto@yahoogroups.com>To: ap-gto ap-gto@yahoogroups.com>Sent: Sat, Sep 27, 2014 11:20 amSubject: [ap-gto] 1100 GTO guiding prblem.



I am having problems tracking and guiding with my 1100. I have the V chip. The mount tracks West faster than the sidereal rate. When I try to auto guide the guiding can not overcome the Westward drift. The result is star trails and the object will eventually drift out of the FOV. I can see the auto guider working but it looses the battle. I have tried guiding at 1x to .25x. The results are the same. Ideas please?

Steve



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

#45268 Oct 4, 2014

was running fast by 1 part in about 45.



How can a quartz crystal clocked GTOCP drive something at the wrong rate?

On Sat, Oct 4, 2014 at 2:03 PM, mike@... [ap-gto] ap-gto@yahoogroups.com> wrote:

.If your skies are cloudy you can still check the speed that the RA drive is running.. As suggested before, remove all cables except the hand control.. Then unscrew the little cup off of the end of the RA worm.. Put a mark on the shaft and see how long it takes to complete a rotation.. The RA gear has 225 teeth.. There are 86164.091 seconds in a sidereal day.. So it should take just less than 383 seconds to complete one revolution of the worm (382.9515 seconds).. I had to do that for one of the AP1200s here which, it turned out, was running fast by 1 part in about 45.. Even then it was very easy to measure - in your case it should be even easier if it really is running fast on its own.



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

#45272 Oct 5, 2014

It turned out the encoder was shot.

Mike



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

#45275 Oct 6, 2014

You mean the motor shaft encoder.��Rolando����-----Original Message-----

From: mike@... [ap-gto] ap-gto@yahoogroups.com>

To: ap-gto ap-gto@yahoogroups.com>

Sent: Sun, Oct 5, 2014 5:28 pm

Subject: [ap-gto] Re: 1100 GTO guiding prblem.





It turned out the encoder was shot.



Mike



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

#45277 Oct 6, 2014

Rolando,�������� Do you have any reports of when, (or if),�� thiswas�� ever finally fixed by SBIG?I have an STL-11000, and wonder if the problem is still lurking there.Also, was it just SBIG, or any other .guider CCD. cameras as well?��Good to know. Thanks.Joe��From: mailto:ap-gto@yahoogroups.comSent: Monday, October 06, 2014 11:19 AMTo: ap-gto@yahoogroups.comSubject: Re: [ap-gto] Re: 1100 GTO guiding prblem.



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

#45278 Oct 6, 2014

I'm not sure which cameras are affected. In your case, no need to wonder. Just plug your STL into the mount via the guider cable, turn off power and see if the mount moves.��Rolando����-----Original Message-----

From: 'Joseph Zeglinski' J.Zeglinski@... [ap-gto] ap-gto@yahoogroups.com>

To: ap-gto ap-gto@yahoogroups.com>

Sent: Mon, Oct 6, 2014 11:09 am

Subject: Re: [ap-gto] Re: 1100 GTO guiding prblem.





Rolando,�������� Do you have any reports of when, (or if),�� thiswas�� ever finally fixed by SBIG?I have an STL-11000, and wonder if the problem is still lurking there.Also, was it just SBIG, or any other .guider CCD. cameras as well?��Good to know. Thanks.Joe��From: mailto:ap-gto@yahoogroups.comSent: Monday, October 06, 2014 11:19 AMTo: ap-gto@yahoogroups.comSubject: Re: [ap-gto] Re: 1100 GTO guiding prblem.



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

#45282 Oct 6, 2014

Rolando:

���� Yes - the motor shaft encoder.

Mike



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

#45284 Oct 6, 2014

Yes, I remember that now. The encoder on the back of the servo motor failed for some reason. The only time that has happened to a Maxon servo that I can recall.��However, in this present case we still don't have clear information as to what the mount or guide star is actually doing, whether a guide camera is plugged in, where it is plugged in, how the guide software is sending info to the mount, whether the mount itself is tracking at sidereal when everything is unplugged, whether we are talking tracking��error or guiding error - many unknowns. ��Not enough information.��Rolando����-----Original Message-----

From: mike@... [ap-gto] ap-gto@yahoogroups.com>

To: ap-gto ap-gto@yahoogroups.com>

Sent: Mon, Oct 6, 2014 4:25 pm

Subject: [ap-gto] Re: 1100 GTO guiding prblem.





Rolando:



���� Yes - the motor shaft encoder.



Mike







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

#45295 Oct 7, 2014

Sorry for the simple stupid suggestion,but it may be worthwhile to check S/N switch position. It is so obviousthat could be overlooked while troubleshooting...



CS



Pawel



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

#45303 Oct 8, 2014

Hi all and especially Rolando,

This has been the most illuminating discussion for me. I have a 1200 GTO with exactly this "problem". I contacted AP a couple of years ago thinking the mount was not driving at the proper rate and got a number of responses about mechanical issues unrelated to mount drive rate. The issue of mount polar axis altitude causing an apparent speed up was never brought up. This is a perfect explanation of the situation; thanks all.

It would seem a good idea to put Rolando's discussion somewhere on the AP website. Perhaps it is there, but I never found it.

Regards,Kent



Contact Us
This Site's Privacy Policy
Google's privacy policies

S
e
n
i
o
r
T
u
b
e
.
o
r
g