[evlatests] Antennas 13 and 14 Status

[Jim Jackson]

Antenna 14:  Jerry and Leon did verify that, as suspected, the 128MHz input 
power to the L302's was low by about 3dB due to the production L305 that 
was installed last week.  All production units are trimmed to have the 
identical output power but apparently the prototype unit had slightly 
higher output power.   They readjusted the levels and resync'ed everything. 
Based on past experience, this was just low enough to cause erratic 
operation of the L302. Please try using the antenna to see if correcting 
this helped the IF B & D issue. Hopefully, this antenna is fixed now. If 
not, we will have to remove the L302-2 synthesizer for testing.

Antenna 13:  They tried replacing the L302-2 with the second unit from 
Antenna 18 (which was sitting in the rack powered off). Unfortunately, it's 
MIB would not come up on the network with module ID.  They are bringing 
both units back for repair.  After a short discussion with Rick, we decided 
to leave both Antennas 13 & 18 functioning with IF's A & C rather than 
breaking antenna 18 to fix antenna 13. So right now Antenna 13 does not 
have B & D IF's. We will try to fix one of the synthesizers and get it back 
out there tomorrow or Wednesday.

Jerry also discovered a timing cable was not connected to the L302-1 in 
Antenna 13. This would certainly have caused some problems with IF's A & C 
and has now been fixed.  You may want to try running this antenna to see 
what effect this had. If both synthesizers were not working, it could 
explain the results from the weekend.

Jim