Re: Major Mark IV Problem

[Chris Albertson <chris@topdog.pas1.logicon.com>]

mgutzwiller@lanvision.com wrote:
> 
> Is it possible that the problem is not vibration but a miscalibrated drive
> rate?  It would be easy to tell the difference.  If the star streaks get
> longer with longer exposure it's a drive rate problem.  If they are constant
> for differing exposure lengths then its most likely a vibration problem.
>

Mike,

Look at Tom's sample star image.  I see a double peak.  It could be
caused by sinusoidal oscillation where the dwell times would be longer
at the ends then at the center.  My "good" software is at home so I'll
look in more detail later but by eye I see two peaks that each look
like streaks them selves.  The streaks are diagonal so maybe there is
some error in the tracking rate and some polar misalignment so they
_would_ get longer over time but if the double peak is real I think
it proves there is vibration also.

 
--Chris Albertson

  chris@topdog.logicon.com                Voice:  626-351-0089  X127
  Logicon RDA, Pasadena California          Fax:  626-351-0699