Steve,
Thank you for you comments :-)
Will try it on first opportunity..
Actually what is visible are not individual steps, but PE introduced by last (second) gear stage (1/4) of my gearbox (as well as Synta's last stage, 1/3).
The tracking used microstepping (32 /usteps).
The audiable vibrations are introduced by half-stepping (while slewing).
You are right, for presentation purposes the better graph would be helpful, but I am already aware what in fact are the problems: last stage in gearbox (both gearboxes actually) and something which is more noise-like and erratic, sudden 3-5 arcsec jumps (bearings?) which has period (?) close to 3 sec. This may be due to bearing.. or dirt in worm gear. Or most likely transfer gears (47 teeth.. and it appears there are that many jumps per main period.. in that case the belt drive would help here)
The attached images have scale 1.07 "/pixel.
However, all that has been done so far was actually an improvement..
Before, only 30% of my 30sec shots (with MTO100A) were usable.. Now I have 60-70% shots that can be used for stacking.
Last edited by bojan; 24-05-2009 at 11:31 AM.
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