[evlatests] Wobbles at L-band

[Rick Perley]

    I have an L-band database, taken about 5 hours after the X and C 
band databases reported on earlier.

    This L-band data is of 3C345 (a good point source, far from the 
sun), with 0.1 second averaging, two subbands, and all 12 antennas 
(although antenna 5 produced no fringes, and had to be flagged). 

    The wobble phenomena for these data are not quite the same as for 
the X and C band data:

    A)  The amplitude-only wobbles at 2 and 4 Hz are present.  As as X 
and C bands, these are only in LCP,  on all subbands, and on all 
baselines connected to antenna 27.   The 4 Hz tone is very much stronger 
(factor of 4 or more) than the 2 Hz tone. 

    B) The large amplitude and phase wobble seen at X and C band in both 
polarizations on baseline 27x28 only is only weakly visible -- at 0.5 Hz. 

    C) Other, single-baseline wobbles are seen, in both polarizations 
and on both subbands, as listed below:

    2 x 15:  0.67 Hz
    2 x 19   0.72 Hz
    8 x 9     1.30 and 1.47 Hz
    15 x 19   0.78 and 1.52 Hz (both are quite weak).
    19 x 24   1.17 Hz
    19 x 25   0.54 and 1.10 Hz  (strong!)
   
    In general, these are seen in both amplitude and phase.