[evlatests] More on Xband

[Rick Perley]

    The X-band 'WIC' loop test, taken yesterday, appears to be as good 
as the C-band, with the only caveat being the mislabelling of the 
subbands, noted earlier. 

    All antennas connected to WIDAR are working in all polarizations. 

    The fraction of integer-zero records is the same (0.4%) as at C-band. 

    Delays (both in parallel and in cross hands) are of the 
single-digit-nanosecond level. 

    The off-axis source images to the correct location. 

    Cross-hand amplitudes are nice and low -- about 3% (these are the 
old, narrowband polarizers), with rather little frequency structure. 

    For both X and C bands, AIPS reports a mean 'closure' level of 0.02% 
-- I'm not sure what this actually means, but it sure is low! 

    We should try some sterner tests now...