[evlatests] Bad polarizer on ea27, at Ka band

[rperley]

I'm reducing the Cygnus A transient data, taken a week or so ago.

ea27, and Ka-band, has a *serious* polarizer problem -- 
cross-polarizations 20% or more, maximizing at 60% (!!!) near 31.5 GHz.

A plot is attached.

Rick
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