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    Default AVX / ZWO / PHD2 - all connected but ZERO guiding



    OK, my current setup is an 8" Edge Hd plus DSLR on a Celestron AVX mount with a ZWO 120MM coupled with a spare 9x50 finderscope for my guidescope (yes, it's not ideal but i had this working fine with my Skywatcher mount) ...The mount is optically polar-aligned to begin with, with no cone error, the optical axis is in line with the RA axis, I go though all the usual stuff on the handset and the GoTo is accurate after a 2 star alignment and a 4 star calibration giving me great Sidereal tracking for 30 second exposures, reasonable for 60 seconds and not so good beyond that. .......So I have PHD2 set up on my laptop, the correct usb to serial cable between the laptop and mount handset with the latest drivers. i have the Celestron drivers added to PHD via ASCOM, I reset all the PHD settings to default, I then connect both the guidescope and the mount with no issues then fire up the guidescope refreshing once a second, the stars are sharp. I test the mount connection with the virtual handset in PHD and the mount slews very well. ...Then I auto select a guide star and hit the guding button and NOTHING happens, the star slowly drifts off from the crosshairs with no RA and DEC lines on my graph at all. Whilst there are dozens of settings i could play with in PHD, i feel that there is something very simple and fundamental that i have overlooked so i would appreciate any input. Thanks in advance.

  2. #2
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    Default Re: AVX / ZWO / PHD2 - all connected but ZERO guiding

    Have you run the calibration routine in PHD2? Are you using darks in PHD2 so you aren't guiding on a hot pixel?

    I guide regularly with my AVX, PHD2, and either an ASI120MM or ASI120MM-S. No issues.
    Bryan

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    Default Re: AVX / ZWO / PHD2 - all connected but ZERO guiding

    Hi,

    There are certain things that need to happen in sequence. First, you need to correctly fill in the equipment profile (make sure give it guide scope and camera number, not your imaging numbers). PHD2 needs this to correctly calculate pretty much everything. The next thing is to get a calibration. You do that by doing what you have been doing. Select a guide star then push the double circular arrows (that's the looping button), then select the green reticle button next to the looping button. The first time you start up PHD2 these actions will start the calibration sequence. Be patient, it takes a while. Additionally, always do your calibration pointed to a star that's reasonably close the the meridian AND the celestial equator. Once the calibration is done, you should be good to go for the rest of the night. The last step, after you get a good calibration, is to run the guiding assistant for at least 5 minutes. This routine gives a wealth of info plus tells you how to "tweak" you settings to get the best guiding possible from you setup. Lastly, let PHD2 auto select your guide stars for you, it is better at this than you are.

    Make sure to read this article as it will answer a lot of questions.
    PHD2 Best Practices

    Cheers,
    JT
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    Default Re: AVX / ZWO / PHD2 - all connected but ZERO guiding

    Many thanks for all the replies and i should get a chance to deploy all the other suggestions tonight if the forecast holds up .... still early days with phd, my first try was on an EQ5 didnt need calibration (maybe it did it automatically and i missed it) and went straight into guiding for some reason, so on my second attempt i assumed the AVX would do the same. Astrophotography would be no fun if it was easy.

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    Default Re: AVX / ZWO / PHD2 - all connected but ZERO guiding

    Quote Originally Posted by Saturn/Uranus View Post
    . ...Then I auto select a guide star and hit the guding button and NOTHING happens.


    ohh i had chuckle reading the title, sorry haha, this is one of the most common questions in all of astro imaging astronomy! where is my guiding!!!

    even happens to the more experience users and it drives us nuts!.

    best of luck, i hope we and yourself can sort it out.

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