[evlatests] [Fwd: UVW reversed on 74 MHz data set]

[Rick Perley]

    All:

    Aaron Cohen reports his images from 74 Mhz data taken last week are 
reversed along both axes. 

    I thought this one had been fixed up.  Is there something else going 
on? 

    Rick

-------- Original Message --------
Subject: 	UVW reversed on 74 MHz data set
Date: 	Mon, 10 Sep 2007 14:42:04 -0400
From: 	Aaron Cohen <cohen at charleston.nrl.navy.mil>
Reply-To: 	aaron.cohen at nrl.navy.mil
To: 	Rick Perley <rperley at aoc.nrao.edu>
CC: 	aaron.cohen at nrl.navy.mil



Hi Rick,

I've been trying to reduce a 74 MHz observation from Sept. 1.  After
failing to get any sensible calibration solutions I just made a raw
image of the center facet and found all source positions flipped in both
east-west and north south axes.  They are also heavily smeared toward
the edges (more than bw smearing could have done) indicating that the w-
terms might be reversed also.  

I've heard that there were some problems with the UVW's being reversed
in some of the data recently and that this could be fixed with UVFIX.
But I tried this and it didn't help.  Any ideas?  Have you noticed this
problem at 74 MHz?

cheers,
Aaron