[evlatests] Lost Command (?) problem

[Bryan Butler]

this still does not mean that it's not a script problem and that there 
was a lost command.  the timing matters, so running it a different time 
can mean a different result.

we've seen no indication of lost commands in any other observing, and 
the fact that this is an extremely complex script still, to me, points 
to that as the culprit.

	-bryan


Rick Perley wrote, On 5/24/12 10:56 AM:
>      Yesterday I reported an instance in Michiel's holography script
> where it was clear that the antennas did not move as (he thinks) the
> script commanded.
>
>      Some have opined that the problem is within the script, and not a
> lost command.
>
>      A simple (but probably not sufficient) diagnostic is to repeat the
> script, and see if the problem repeated.  This was done this morning.
>
>      Answer:
>
>      The problem did *not* repeat.  The antennas moved as directed.
> Careful examination of the full 121 raster points show that we did see a
> 'non-moving' instance on any position.
>
>      At this point, it may be useful to succinctly restate the
> characteristics (and correct an error in my summary yesterday):
>
>      1) For one commanded step, (and only one), the antennas did not
> move.  This applied to *all* antennas.  So all antennas stayed at the
> previous  position.
>      2) At the following step, all antennas went to the correct place,
> and have the correct angular coordinates.  My report yesterday stated
> that all subsequent positions had angular coordinates one step off.
> This was incorrect.  The only effect is that the 'missing' position has
> incorrect amplitude and phase.  All other positions are correct.
>
>      So, it looks like a 'lost command' to us.  Fortunately, this is a
> very rare problem.
>
>
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