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Equipment Discussions >> Mounts

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GeHe
super member


Reged: 08/06/11

Loc: Germany
TDM Question
      #5887563 - 05/27/13 05:47 PM

Hi,
I have a TDM-unit , version 2.2 , in combination with Losmandy G11, FS2, Lodestar, MaximDL.
I got interferrences between TDM and lodestar , when lodestar wants to correct , I got -16 parsec-spikes , therefore, i reduced the autoguider intervall down to 20 sek. and agressivnes down to 1 in both directions.
The spikes makes me nervous.
is it normal , or can i reduce this interferrences with a special parameter set ?
can i reduce the autoguiderintervall down to 60 seconds ?

what is the common way to work in this combination ?

thanks for answers.


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GeHe
super member


Reged: 08/06/11

Loc: Germany
Re: TDM Question new [Re: GeHe]
      #5887574 - 05/27/13 05:57 PM

Am idea is , that the speed of RA is to slow or too quick , that the corrections were very stong , could it be ?

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GeHe
super member


Reged: 08/06/11

Loc: Germany
Re: TDM Question new [Re: GeHe]
      #5890388 - 05/29/13 09:34 AM

no idea ?

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D_talley
Carpal Tunnel
*****

Reged: 07/07/05

Loc: Richmond VA
Re: TDM Question new [Re: GeHe]
      #5890515 - 05/29/13 10:54 AM

Not many people here use the TDM so you will not get many responses. I did not use a guider when I ran my TDM so have not had that problem.

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Astronewb
Pooh-Bah
*****

Reged: 09/19/11

Loc: Connecticut
Re: TDM Question new [Re: D_talley]
      #5890869 - 05/29/13 03:23 PM

Hello Gerhard,

On the TDM website > http://www.mda-telescoop.com/index.php?option=com_content&view=article&am... < there is information that might help you with your question. In addition, there is a TDM group on Yahoo groups that Attila monitors and quickly responds to questions.

On my version 2.5 TDM/iEQ45, I use autoguider exposures of 2 seconds and up, to prevent conflicts with the TDM updates in RA. In PHD, I use a RA aggressiveness setting of only 20, so that the TDM does almost all the corrections, and corrections in DEC are handled by PHD.

Here is a PecPrep graph using those settings:


PecPrepRA_032613_iEQ45wTDM by Astronewb2011, on Flickr

Hope the info helps, good luck

Paul

Edited by Astronewb (05/29/13 03:24 PM)


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GeHe
super member


Reged: 08/06/11

Loc: Germany
Re: TDM Question new [Re: Astronewb]
      #5910864 - 06/09/13 04:24 AM

Hi Paul ,

Thanks , meanwhile, I got informations from Attila direct , the spikes on TDM monitor does´nt matter.

Thanks

Gerhard


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Astronewb
Pooh-Bah
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Reged: 09/19/11

Loc: Connecticut
Re: TDM Question new [Re: GeHe]
      #5911163 - 06/09/13 11:28 AM

Okay Gehard, very good information to know, and straight from the developer....:)

Cheers,

Paul


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orlyandico
Postmaster
*****

Reged: 08/10/09

Loc: Singapore
Re: TDM Question new [Re: Astronewb]
      #5912153 - 06/09/13 10:05 PM

Here's my interpretation..

Heidenhain only guarantees an accuracy of 12.96" for that particular encoder. So any deviations less than this is probably more imaginary than real.

I'm sure the TDM is doing some form of Kalman filtering (or similar) to improve the accuracy. Such a scheme requires that there will be spikes and jumps that go uncorrected.

That is, unless the TDM folks have found a way to suspend the laws of physics...


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