[evlatests] ea17 subreflector position

[Gene Cole]

Rick, how critical is the need to fix this.  The goes into overhaul mid-March.

--Gene 


-----Original Message-----
From: evlatests [mailto:evlatests-bounces at listmgr.nrao.edu] On Behalf Of Rick Perley
Sent: Wednesday, January 14, 2015 4:04 PM
To: evlatests at aoc.nrao.edu
Subject: [evlatests] ea17 subreflector position

     The (very) extensive holography that we've been doing the past couple of weeks has revealed a number of issues.

     Perhaps the most outstanding is that the horizontal position of ea17's subreflector is more than 10 mm off!  This is huge.  It is seen (at the same level) in all four frequency bands that we've utilized:  X, Ku, Ka, and Q.  The corresponding phase error on the main reflector is big -- over 100 degrees at 41 GHz.


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