[evlatests] EVLA L-Band on Antenna 24

[Bob Hayward]

The new EVLA L-Band receiver (S/N 01) was installed on Antenna 24 
yesterday. It is still cooling. The OMT is at 92K - we're hoping it gets 
down to about 65K. The receiver still requires its cabling to be 
finalized before it is ready for use. That should be completed today.

Note that I have set the noise calibration step much higher than usual 
(about 8K rather than the usual 1-2K). This is to allow us to achieve 
better accuracy in transferring the calibration measurements that we did 
with the integrated feed+receiver test in the Barn last week (the bigger 
the noise diode Y-factor, the better the on-antenna Tsys measurements 
will be). Once Rick and I are done of our efficiency tests in September, 
I'll pad the noise diode down to a more acceptable level.

-Bob