[evlatests] antenna 26

[Ken Sowinski]

Jerry and Donna reported a little while ago that 26 was ready
to try.  It sort of works, here is a preliminary report.

Power out of the X band receiver is very weak.  Even with the
T304 attenuators set to zero the output power is about -34 dBm.

Even so fringes were seen in a narrow bandwidth.  However
the distribution among correlator products is interesting.
AA  very 0.18, steady phases
CC  weak amplitude
AC  0.17, steady phases
CA  very weak amplitude
I am hard pressed to see how to get it to do this.

The SD for IF C is unstable once again.  Rob and Jerry
noticed this and fixed it by cycling power at the DTS
module.  It seems to have come back again.

No attempt has yet been made to set delays, focus or pointing.