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  1. #1
    satelliteme's Avatar
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    Default PEC for CGE Pro Mount



    I have a CGE Pro Mount with an HD1100 mounted on it. I performed the PEC procedure and it seemed to work in the area of the sky where I performed the PEC procedure, but not in other areas of the sky. Is this to be expected?


    Thanks for the help.

  2. #2
    KathyNS's Avatar
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    Default

    I haven't worked with PEC, but it makes sense to me that it would behave like that. The correction is for irregularities in the drive gears. You would be using a different arc of the gear in one part of the sky than another.

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  3. #3
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    Default

    I use a different mount and am trying to get my PE under control also.
    Did you let your mount settle when you moved to a different part of the sky?
    I’ve tried a manual PEC on my mount and monitored it with a web cam and K3CCDTOOLS. My PE appeared as non-sinusoidal waveforms in K3CCDTOOLS for the roughly the first cycle of my worm gear then settled into somewhat sinusoidal waveforms.
    I’ve played with computer controlled PEC using the same web cam and Pempro, so far I’ve gotten better results using computer control.
    I have many more experiments to do. It seems most people aren’t trying to perform PEC at the mount but are instead turning to guiding which reduces most all of the errors in tracking.
    Good Luck.

    Keith,
    In most cases the largest contributor to PE in an EQ mount is the worm gear that turns the RA. The worm gear has roughly an 8 minute cycle while the RA has a 24 hour cycle. The are smaller gears and harmonics and sub-harmonics that contribute, most on a much smaller scale than the worm gear.
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  5. #4
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    Quote Originally Posted by pederv View Post
    I
    Keith,
    In most cases the largest contributor to PE in an EQ mount is the worm gear that turns the RA. The worm gear has roughly an 8 minute cycle while the RA has a 24 hour cycle. The are smaller gears and harmonics and sub-harmonics that contribute, most on a much smaller scale than the worm gear.
    I didn't realize that the worm gear contributed more than the 24-hr gear. Still if that gear was out of whack, wouldn't it show up with those symptoms?

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  6. #5
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    Quote Originally Posted by KeithBC View Post
    I didn't realize that the worm gear contributed more than the 24-hr gear. Still if that gear was out of whack, wouldn't it show up with those symptoms?
    That's why I asked Satelliteme if the mount was allowed to settle.
    I think Satelliteme's issue might be affected by something I think you brought it up when doing a star alignment. It had to do with coming from the correct dirrection, I think it was from the right and from the top.
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    Atlas 10 EQ-G
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    / Orion 130ST on an AstroView Mount with RA Drive
    EPs - Orion Plossl (10mm, 25mm, 32mm, 40mm), Tele Vue Plossl (32mm), Orion Stratus (5mm), 12.5mm Orion Illuminated, 7-21mm Orion Explorer II, set of Orion Q70's
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