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Re: Need advice on strange guiding problem

 

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Paul,

I have calibrated and re-calibrated many, many times. ?I have also tried a variety of different pulse lengths for calibration. ?If calibration is off then there must be some other fundamental problem that is causing it. ?I¡¯ve attached the Calibration Plot that Ekos generates. ?It doesn¡¯t look particularly bad to me.

I do use a somewhat longer pulse length (around 1250 ms) because if I do shorter the Dec calibration looks worse.


PastedGraphic-1.png

Sometimes the Dec calibration dots can be a bit squirrely although the ones here look fine to me.

I should also mention that I¡¯ve tried adjusting the RA worm play ad nauseum and that doesn¡¯t seem to help.

Bill

On Sep 28, 2024, at 9:22?AM, Paul Kanevsky <yh@...> wrote:

Hi Bill, it looks like to me that the autoguider isn't calibrated properly. Corrections are often insufficient in RA, and sometimes overshoot a quick jump. The first step is to measure your periodic error during tracking (capture a few cycles of tracking error while not guiding). See what tracking looks like without autoguider corrections. Then, a guide log may help diagnose what's going on while guiding is engaged. PHD2 also has a number of diagnostic/calibration tools that may help figure out what's going on.
?
Regards,
?
?-Paul
?

--?
Bill Tschumy
Otherwise -- Longmont, CO
www.otherwise.com
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