[evlatests] More bad news ...

[Michael Rupen]

One additional datum (from an X-band continuum run a couple hours ago) -- the
data on VLA-EVLA baselines look fine.  So this is some EVLA-EVLA only problem.

Phases look fine, even on EVLA-EVLA baselines, though the phases (on VLA
as well as EVLA...) are less stable than I would have predicted based on
API rms of 5.2 degrees (I see 50-ish degree variations over a minute at X 
band).  This is purely an amplitude effect.

According to AIPS, Tant on the VLA antennas is 30-40 K; EVLA antennas
are about twice as high.

Blah.

           Michael


On Mon, 7 Jan 2008, Rick Perley wrote:

>    The current EVLA situation is even worse than stated in the last
> message.   There are enormous closure errors, in addition to the loss in
> sensitivity.
>
>    CALIB, when run with all antennas, shows closure errors in excess of
> 100% for EVLA antennas only.  When the antenna set is  restricted to VLA
> antennas only, there are no errors above the 5% level.  When the antenna
> set is restricted to EVLA antennas only, closure errors at the 50% level
> are seen on all EVLA antennas.
>
>    This is a serious issue, and needs speedy attention.
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