1816RE: [ccd-newastro] Dec drift while guiding with a LX-200
- Apr 1, 2001Lowering aggressiveness is a good idea. You can also shorten the maximum
time for a Dec correction in most camera control packages.
The New CCD Astronomy
From: al brockman [mailto:alanb@...]
Sent: Sunday, April 01, 2001 5:55 AM
Subject: [ccd-newastro] Dec drift while guiding with a LX-200
I have been very encouraged in my persuit of better tracking with the
LX200 mount by use of a relay switch developed by Wesley Erickson. I tried
it out for the first time two nights ago with my ST-8 and what it does is
deceptively simple but now allows the guide chip to track in both RA and
DEC without problems caused by DEC backlash - ala' the Death Wobbles'. It
switches off a north or south direction so that Dec movements occur in one
direction only to correct for the inevitable DEC drift. Over a combined 60
minute exposure, the guide star never left the window and stayed centred.
Normally I must switch off Dec corrections and see a slow drift over time
that I can never quite tweak out by Drift aligning. There were occasions of
overshoot but I think I can improve that by changing the aggressive
setting. Is there a better way to adjust this?
My sincere thanks to Wes.
Shoklo Malaria Research Unit
PO Box 46, Mae Sot, Tak 63110
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