[evlatests] AR603 yesterday (Sunday): quick check

[Ken Sowinski]

Thank you , Michael.  Some comment/explanations.

On Mon, 2 Oct 2006, Michael Rupen wrote:

>  1oct06: AR603 (17:42-20:30 IAT)
> --------------------------------
> mpr  2oct06
>
> Preliminary report -- quick fringe check
>
> X C bands, standard continuum, 3.3s averaging, mostly fast switching scans
>
> "Regular" run
>
> EVLA ant. 13,14,16,18,24,26 included
>
> --------------------------------------------------------------------------------
>
> Summary:
>   - all good fringes except 26
>   - 26 has no data from IF 2
>            random phases on IF 1 C band
>            good fringes on IF 1 X band

26 only has X band IFs AC so far.

>   - ~60d phase jumps on all EVLA-VLA baselines in middle of two fast

We have been seeing lots of this lately.  Vivek can show some
examples from a baseline run.

>     switching scans (EVLA-EVLA and VLA-VLA show no effect)
>   - Tsys OK except
>     : some crazy Tsys in middle of one fast switching scan at C band at
>       C band (120-ish K) for 13,18,24

???

>     : high Tsys at X band on 24 (80-100 K) and 26 IF 1 (70-90 K)

The T_cals for these two receivers have not yet been set.
Consider this a ping to the FE group.

>   - Some bad EVLA data still leaking through at beginnings of scans,
>     particularly fast-switching sub-scans

Nothing has changed with refard to flagging.  It looks like
some memory or faster response is needed when integration
tims are short.