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Thread: Guide to Autoguiding the LX90

  1. #11
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    sorry you do have the 90. I should read more. regards

  2. #12
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    yes i have a classic one, and an orion 80 ed for autoguiding with a SC1 Toucam driven by PHD , I have to improve my guiding, 50% of my picture do not have round stars, wrong balancing? too bad alignment? flexure? I heard people having 2arcsec FWHM but I am closer to 5-6 for 10 min exposure. I do not known what I can expect with my setup,equiment, and location.
    regards

  3. #13
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    I too struggled with the bloated out of round stars even with very close to perfect alignment. I would have at least 10 minutes of my alignment stars bisecting the cross hairs of the reticle. My problems were threefold in 1) out of balance as I had too much camera stuff hanging off the end, 2) periodic error on my mount was pretty bad, 3) setting the PHD parameters was hit and miss particularly in declination for some reason or other even with great polar alignment. I can only attribute that problem to the mount. Alignment and balancing are key to the start to good photos, along with training the PEC out using the autoguider. Once you are able to capture good photos then the whole world of processing comes into play and there is much to learn there as well.

    Speaking of flexure if your mounting system is solid and stable that shouldn't be to much of an issue. Also remember when focusing the LX90 to finish the focus in a counter clockwise turn of the focuser to prevent mirror flop.

    I must add the disclaimer that I am no pro and am learning new things everyday and there are many very experienced folks here that can add extensively to the learning. I am attaching one of my recent tries of the orion nebula just for fun.
    Attached Images Attached Images

  4. #14
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    I've read this guide and am having some problems. I have an older LX90 8" (non GPS - circa 2002). I have the 505 serial port adapter going from a win7 32 bit computer via COM1 to the autoguider controller secondary port. If I use the Meade Autostar suite I am able to connect to the scope and move the motors from the computer.

    I then installed the ASCOM 5, updated to 5.5, and used the legacy LX200 drivers (as shown in this guide). I've set this to COM1. When I use PHD, and connect via ASCOM it shows it connects fine - no errors (Scope indicator shows good after I click the telescope button). However, the star always moves out of alignment quickly (1 minute or so), even after a successful calibration. If I try to manually move North, South, East, or West I do not hear any slewing from the motors. This is why I think it's a communication problem, not user error with PHD guiding.

    Is there something else I'm missing?

    I've also tried this: I also have a GPINT-PT, connected to a #909 port (CCD), connected to a SPP-100 EPP Parallel PCMCIA card, using a Shoestring supplied cable. I've tried plugging the #909 in to the Autoguider controller's second port as well as both AUX plugs on the scope. I tried the GPINTCheck, but I cannot get it to control the motors. I changed the LPT ports to match the memory addresses showing on the GPINTCheck.

    I can connect and move the scope with the Meade software, so I think the mount works, but I'm at the end of my knowledge. Any help would be greatly appreciated.

    Thanks,
    Jonathan

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    Turn off "Use newer pulse guiding" in the Ascom telescope setup in PHD.

    Worked a treat with my LX200 Classic.

  6. #16
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    Hi

    I can't this option in ascom telescope setup. Is it only for LX200 driver or for ascom in general?

    I have a gotonova kit and it doesn't support pulse guiding.

    Thanks

    Ricardo

  7. #17
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    OK - in the end I went for an off axis guider and it worked out fine.
    My stars aren;t bloated and whilst PE is a little erratic, it doesn't ruin many shots -
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  9. #18
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    I'm getting some weird stuff now - like the PHD isn't giving Dec commands and the RA is slow one way (W) and really quick the other (E) so if it calibrates 10 seconds west, by the time it has gone 10 seconds East, it is two boxes past the crosshairs.
    Any ideas?
    I'm going to go out and balance my kit again but I don't expect miracles
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  10. #19
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    I was told my Meade that the 909 is no longer compatible with Autostar and that's why it was orphaned,. I bought one anyway and it did not work despite downloading an older version of the firmware. Meade tech support is no help on this issue, and "recognizes a problem guiding the LX90" so I mounted my Meade OT on a better mount, cg-5 GEM with ST4 input - that's the only way I could get guiding on my LX90 - don't know how you all got it to work - you really need to try the guiding out, not just hook it up to PHD. It's in the calibration step that you can see it fail, as no signals ever reaches the mount and your guide star goes shooting off to the right.

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    No, it was a programme error that has been fixed by starpatch - download their firmware and PHD will guide fine.
    What was happening was the RA +correction was being injected into the DEC axis - which was fine until the guiderwent to + and then the dec went swinging off the scale - usually after a few seconds unless you setup was good.

    I'm getting 6 minute frames now. using the gear in my signature.
    Or I would be if the weather was nice for long enough!
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