[evlatests] Wobble-itis at S-Band!

[Rick Perley]

    In finishing up the 'receiver rotation trick' calibration, I'm 
generating interim models for 3C147 at the observing bands.  This caused 
me to look closely at the visibilities.  The data were taken last night.

    To my dismay, I've discovered strong evidence for 'wobbles' at 
S-band.   The characteristics are all the same as described in the past. 

    The baselines involved, as usual, don't close.  They were easy to 
identify:

    8 with 6, 10, 16, 28
    10 with 16, 28
    16 with 28. 

    Presumably, there is some magical relationship amongst the 
antennas:  6, 8, 10, 16, and 28. 

    I only looked at subband 8 (2.9 GHz central frequency).  Both 
polarization pairs are equally affected.