[evlatests] EVLA antennas

[Jim Jackson]

The following changes have been made to the EVLA antennas today:

A T301 4P converter has been installed in Antenna 18 and (at least to us) 
appears to be working.  P band should be available.  4-Band should be 
available once the dipoles are installed.

The EVLA antennas have been switched over to the 5MHz signal from the VLA 
LO racks.  This will allow the EVLA to follow the VLA should a backup 
references be connected in the event of a MASER outage.  This added 20-30ft 
of cable to the 5MHz timing to the EVLA. We're not sure whether or not this 
will effect delays  but it could.

Antenna 26 did have RCP accidentally connected to both T304's. This has now 
been corrected.  IF-C should now be LCP

A repaired L302 synthesizer was put into Antenna 16 IFs BD (L302-2). 
Hopefully this will fix the intermittent locking problems we've been having 
for the last few weeks.

The T304-a in antenna 16 has been reinstalled with a new analog 
board.  This should prevent the power supply overvoltage alerts that kept 
occurring in this module.  The RF section was not replaced so attenuator 
settings should remain the same.

They also discovered that timing was off by 7ms.  Apparently this was an 
issue with the IAT clock that probably occurred yesterday when MASER work 
was performed.  This has now been corrected.

Jim