[evlatests] WIDAR-0: short scans show phase jumps at X band

[Michael Rupen]

> On Tue, 16 Jun 2009, Michael Rupen wrote:
>
>>  * Both X and C bands show phase jumps at roughly the same rate
>>    (3 jumps at X and 2 at C band).
>>    - The antenna groups are the same at both bands:
>>       1  3  9 23 28
>>       2 18 19 24 25
>>      This confirms the earlier observation that the phase jumps track
>>      slot number rather than antenna.
>
> Do both subbands flip at the same time?  Is it clear that
> it happens at a scan boundary?
>


1- Both subbands flip at the same time.

2- The scan boundaries near the flip behave as follows:

   MS scan list shows:
     Scan 22: 22:11:26.5 - 22:11:45.5
     Scan 23: 22:11:46.5 - 22:12:05.5
   PRTUV in AIPS shows:
           Time       Baseline   Amp Phase (for channel 500, IF 2)
       0/22:11:45.50    1- 2    3.358  40
       0/22:11:46.50    1- 2    3.181  34
       0/22:11:47.51    1- 2    1.011-144
       0/22:11:48.50    1- 2    3.297-140

   So this says the flip occurs during the first integration AFTER the
   scan boundary, rather than right on the scan boundary.

-- Michael