[evlatests] Ku-band Polarizer problems

[Rick Perley]

Observations made over the past two months show some antennas have problems with the Ku-band polarizers.

Most of these are at the high frequency end — between 16 and 18 GHz.
Bad antennas of note:

ea03:  cross-polarization of 10 to 20% between 16.7 and 17.6 GHz.

ea07:  10 to 40% between 16.2 and 18 GHz.  Also shows a resonance-like bump to 40% at 14.4 GHz.

ea14;  10 to 50% above 16.6 GHz.

ea15;  10 to 25% above 17.2 GHz.

ea02 and ea05 show a single high spike in cross-pol (to 40%) around 17.8 GHz.

All others are generally less than 5% over the entire band.

rick
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