[evlatests] ea22 L-band

[Rob Long]

Hello everyone,

I did not get to go to ea22 today (I actually got an appointment to get 
my vaccine in Los Lunas), but the team did.

A coupler was installed between the L-band and the S2 switches with a 
spec an connected. The guys said that not only did everything look 
normal, but they could not get it to set up incorrectly using maint 
scripts. They tried switching to various bands and back to L-band and it 
always set up correctly on the first try.

Couplers were re-positioned after S2 and before T302; everything looked 
normal and set up correctly every time first time.

Couplers were moved to output of T302 (IF-B) and everything was still fine.

The antenna was switched from various bands back to L for 1.5 hours and 
never failed.

As soon as I got back home from vaccine mob and spoke to the team, I ran 
a maint script for L (it had been in X-band for a long time) and it 
immediately failed. Running a second script fixed the problem and 
everything set up correctly. The winds have everyone kicked off of the 
antenna, but I want to try installing a 1 dB pad on the outputs of the 
L-band receiver tomorrow if we can get the antenna for a short visit.

Rob