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Old 18-02-2015, 01:45 AM
dmizen
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Join Date: Aug 2006
Location: GOOSEBERRY HILL
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tuning bartells stepper system

i have a barbells system i acquired (from richardo i think) some time ago and transplanted it onto my 16" geq it runs slewing is ok but tracking appears fast i have to keep correcting the ra by driving the scope east

my original calculated altfullstepsizearcsec figure was 0.84375 this tracked very fast so i have gradually increased the value and tracking has improved i can keep jupiter in a 30mm eyepiece for about 15 mins I'm now at 1.8 i guess i need to be around 2 or 2.25 but this is along way from my calculation

i am reasonably polar aligned

my question is :- is this the most efficient way of slowing the drive down or is there an other way of slowing things down

dcm
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Old 18-02-2015, 05:52 AM
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bojan
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You have to re-calculate again..
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