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Re: ES Losmandy G11 RA Backlash


 

HI Sunil

Here's my observations from your guidelog looking at your two longest runs

1. your settings are not very optimized for your conditions and equipment. your min move on RA is too high, it's at 1" and you are guiding at 0.82" so i'd say for that min moves your guiding is where i would expect it. Run guiding assistant and/or set that value lower
2. your seeing looked less good in the second long run (segment 11), i think your exposure time should be longer to even that out - maybe 2.5-3 seconds
3.? you should enable dec backlash compensation in PHD which will clean up your DEC guiding. a guiding assistant run should make a recommendation there, but if not i would start with 800ms with a max of 2500ms and let it adjust itself
4. after tightening up min mov in RA (and DEC too), if you still need better guiding results you can try predictive PEC algorithm for RA. i'd set the period to 239.9 and disable auto adjust period.?

that should be a good start



On Sat, Dec 26, 2020 at 5:16 AM Sunil Bhaskar Bhaskaran <cyclops12321@...> wrote:
Hi,

? ? ? I own a ES Losmandy G11 Pmc8 variant of the Gemini2 system and I seem to have some serious RA backlash issues. I tried to get help in the ES Pmc8 forum but I was told to approach the Losmandy group. The mount is around 3 years old and I recently lubricated it using Super Lube. Guiding seems to be all over the place and most of my subs are getting discarded by SGP. The mount worked fine when it was in US but now after relocating to India(shipped via freight), it seems to have developed some serious backlash issues. I managed to fix the DEC backlash to some extend but the RA seems to be a whole different story. Appreciate any help you guys can provide. The autoguider is qhy5ll on a 200mm finder. Attaching the phd2 log. Please let me know if anyother details are needed from my end.

Sunil?



--
Brian?



Brian Valente
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