[evlatests] Wobble-ology

[Rick Perley]

    Michael thrust upon be a much larger database, X-band, with two 
sources -- a strong calibrator and a nearby blank field.  Averaging time 
was 0.1 seconds.  Two sub-band pairs, dual polarization. 

    Summary of findings:

    1) The 2 and 4 Hz amplitude-only wobbles are seen, as before, on all 
baselines to antenna 27, in LCP only.  Both subbands show this. 

    2) The only other wobbles, seen generally in both amplitude and 
phase, on both subbands, and on both polarizations, are on baselines:
   
    2 x 15   (2.5 Hz)
    2 x 19   (2.2 Hz)
    15 x 19   (2 Hz, LCP only)
    19 x 25   (1.2 and 2.4 Hz)
    19 x 24 

    3) None of these wobbles are seen on the blank source.  This clearly 
states that the effect is a multiplicative one -- it is proportional to 
the strength of the correlated signal.