[evlatests] antenna 1

[Ken Sowinski]

It sort of works.

The signal paths look OK at L and X bands.  And fringes are obtained.

There is no, or little,  noise getting to the downconverter
at K band.

Early in the day it was difficult because the subreflector appeared
to be stuck close to the right place for L band.  That was fixed in
mid afternoon.  After that nothing worked and the problem was
eventully found to be that the subreflector rotation positions are
now about half a turn from where they were when measured last week.
X band differs by about 192 degrees, L band by about 180 degrees.
The difference is probably accounted for by unknown pointing errors.

Delays have been made close at X band, but not much else can be done
until the subreflector is properly indexed or re-zeroed because
pointing errors and rotation errors are degenerate.