[evlatests] AM889 observation now on the EVLA: EVLA PHASES!!

[Ken Sowinski]

On Fri, 6 Jul 2007, Ed Fomalont wrote:

> Using antenna 9 as reference (a nice VLA antenna), the phases for almost
> all of the EVLA antennas have the following property:
>
> Phase difference IF 2 - IF 1: Stokes 'R'

Same thing for Stokes 'L'?

>   From 13:30 to 15:30 there is a phase gradient of 40 deg over the two
> hours.
>
>   The phase difference then resets to the 13:30 value and
>
>   From 15:30 to 17:30 this phase difference repeats.
>
...

> Now using an EVLA antennas as reference, most of the other EVLA antennas
> show little phase difference change between IF1 and IF2, although this
> difference appears noiser with a few 5 deg glitches.

I don't think any of this prevents the problem being
something wrong with VLA antenna phases.  Flukes?