VERY LONG BASELINE ARRAY OBSERVING LOG
--------------------------------------
Project:      BC120BA
Observer:     Chatterjee, S.
Project type: VLBA
Obs filename: bc120bacrd.*
Date/Day:     2003JUN28/179
Ants Used:    SC HN NL FD LA PT KP OV BR MK

=UT-Time===Comment===============================================MF#===%AD==AMD=
     0618  Begin file                                                           
           VCLOCK check ok. SC at -0.168                                        
           UT1-UTC time check ok.                                               
           GPS delta < 10 us                                                    
           Operator: T. Perreault                                               
0618-0622 *LA recovering from a loss of commercial power         11858  100    4
           earlier this evening that caused several false fire                  
           alarms. 20cm DEWAR is cold, but there is an ACU                      
           error (servo on synchro). Site tech Gene Dunn is                     
           on site and working on the problem. Antenna is                       
           not pointing correctly.                                              
     0626  LA site tech Gene Dunn is leaving site, He is done    11858          
           for the evening. He will start the 6cm and 7mm                       
           DEWARs cooling from home.                                            
0656-0804 *LA there is an EL pointing error of up to 6"          11858  100   68
           and getting a "jump" in EL by 5 degrees. Looks like                  
           there is an EL oscillation. Still have a "Servo on                   
           synchro" error. Called Gene on his cell phone, he                    
           is returning to the site. Have parked the antenna.                   
     0719  LA site tech Gene is back on site, he says that the   11858          
           EL encoder is oscillating badly (i.e. sending                        
           oscillation commands to the EL drives). He will                      
           check it out to see if it can be fixed.                              
     0728  NL wea: raining                                                      
     0750  LA site tech Gene called, said that the encoder is    11858          
           dead as a result of the loss of commercial power                     
           that happened earlier. Removed LA from observing                     
           for the weekend and rebooted the site computer.                      
0755-0800 *FD autostowed. Power glitch. Repointed.               COM    100    5
     0757  LA site tech Gene called, said that he may have       11858          
           corrected the problem, asked to have observation                     
           reloaded. Did so, have repointed the antenna.                        
     0804  LA on source, EL pointing looks stable. Gene has      11858          
           the ACU rack pulled out, going to leave things                       
           alone. He said that if it acts up again to park the                  
           antenna and leave it until Monday.                                   
     0819  End.                                                                 


Downtime Summary:
	Total downtime : 77 min
	Percentage downtime of observing: 6.4%
	Average downtime per hour : 3.8 min

    Total scheduled observing time (# Antennas): 1210 min (10)

Notes:
    * = Entries where data was affected.
    % = Entries where data may have been affected.
    & = Entries where the site tech was called out.
  WEA = Weather entries.
  MF# = Maintenance form or major downtime category associated with a problem.
  %AD = The percentage of an antenna affected by a problem.
  AMD = Total antenna-minutes downtime for a problem.
 Tsys = System Temperature (TP/SP x Tcal/2)
  ACU = Antenna Control Unit
  FRM = Focus/Rotation Mount
  RFI = Radio Frequency Interference
  VME = Site control computer
   CB = Circuit Breaker
 vclock = Program that compares site clock time to a standard.