[evlatests] [Fwd: Re: still some subreflector problems]

[Rick Perley]

    ... forgot to send this to everybody. 

-------- Original Message --------
Subject: 	Re: [evlatests] still some subreflector problems
Date: 	Mon, 02 Jul 2007 19:28:51 -0600
From: 	Rick Perley <rperley at aoc.nrao.edu>
To: 	Ken Sowinski <ksowinsk at nrao.edu>
References: 	<Pine.GSO.4.64.0707021737210.19897 at eki>



   I can add some observations here. 

   I ran my 'stress test' at the end of software time.  The file has a 
'dummy' X-band observation at the beginning, to permit antennas to move 
and get on source, and any residual initial conditions to be dispenses 
with. 

   The first observation -- at X-band -- was started quite early, a few 
minutes at least before the scheduled start time.

   After 14 minutes on this 'dummy' source, no VLA antenna gave any 
fringes.  All the EVLA antennas, except 14 and 16, were on source within 
4 mnutes of the start of the dataflow.   Antenna 14's good data began 
very late -- only one minute before the end of the first scan.  Antenna 
16 never gave any good data on this first scan. 

   An X-band observation was made about 35 minutes later.  This time, 
all antennas fringed nicely.  Antenna 16 is being partially flagged, but 
the data are actually quite nice. 

Ken Sowinski wrote:
> I have seen two examples today where the VLA antennas,
> controlled by the CMP were sent rotation commands for
> the first scan of a file (rotposcmd is correct), but the
> command was not seen at the FRM hardware.  In both cases
> the right thing happened at the second scan.  Also in
> both cases the files were started long before the
> scheduled start time.
>
> _______________________________________________
> evlatests mailing list
> evlatests at listmgr.cv.nrao.edu
> http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests
>