I Can't Guide After Meridian Flip

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Free Mind

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Feb 19, 2023, 11:20:50 AM2/19/23
to Open PHD Guiding
I Have a serious problem with my EQ6 Pro Skywatcher mount. I'm having very good guiding on the East side of the meridian, but after passing it, and start guiding on the West side, the whole troubles start.  I try everything possible. From my cables, recalibrating, rebalancing, etc..., Nothing absolutely nothing can be done to fix it. My RA goes wild. Just dropping under 3 Arc_Second. (My problem is not in my DEC, but more particularly in my RA). Thank you for your help. 

Brian Valente

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Feb 19, 2023, 11:47:40 AM2/19/23
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Hi Free Mind

From your guidelogs it looks to me like Dec is actually the issue after meridian flip?

We'll talk about that in a moment, but one thing i noticed is your guidespeeds are far too slow at 1.5as/s, make sure you set up EQMOD according to the instructions here: https://github.com/OpenPHDGuiding/phd2/wiki/EQASCOM-Settings

Here's your guiding on pier side west (pre flip), which is generally okay, but you have dec backlash, you should enable auto dec backlash compensation, try starting with a value of 800ms for backlash amount

image.png

When you do the meridian flipm you can see Dec is the thing that flies away: (in red)

image.png

You should run the Calibrate Meridian Flip tool to set the flip dec and resolve this

At segment 10 you re-did your calibration after pier flip, and it guided reasonably well, so that's further indication your setting here is not correct. There was one large (30" ish) RA excursion that was immediate and unrelated to guiding, could be a bump, cable snag, etc.but it does not look indicative of anything recurring

image.png

One other thing is that once you did the flip, you tried a number of calibrations that were very poor. You should be reviewing your calibrations and pay attention to any warnings that come up. Trying to guide after a poor calibration is wasting your time



On Sun, Feb 19, 2023 at 8:20 AM Free Mind <serg...@gmail.com> wrote:
I Have a serious problem with my EQ6 Pro Skywatcher mount. I'm having very good guiding on the East side of the meridian, but after passing it, and start guiding on the West side, the whole troubles start.  I try everything possible. From my cables, recalibrating, rebalancing, etc..., Nothing absolutely nothing can be done to fix it. My RA goes wild. Just dropping under 3 Arc_Second. (My problem is not in my DEC, but more particularly in my RA). Thank you for your help. 

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