[evlatests] Pointing

[Ken Sowinski]

On Mon, 8 Oct 2007, Rick Perley wrote:

>    My tests last week indicated something amiss with antenna 13 at high
> frequencies.  Today's test (with referenced pointing) shows the problem
> -- pointing is way, way off.  And 13 is not the only one far out of spec
> -- antenna 20 is also off by more than an arcminute.    Others are in
> the 0.5 arcminute area...
>
>    I think we need a pointing run.  We have 4.5 hours of dynamic time
> late tonight -- ideal for pointing, with the good weather ...?

Rick,

ea13 has a subreflector problem.  It was worked on last
week on Monday, but the effect on pointing has not yet
been determined.

va20 suffers collimation bumps from time to time and no
one has ever been able to explain why.

There is a pointing run scheduled for the night of Oct 19
after the completion of the move to B array.  If you want
to use time tonight for pointing I suggest a collimation run
(SYSCOLL, please) so that we can try to characterize ea13
and check on the newly comissioned receivers.

Ken