VERY LONG BASELINE ARRAY OBSERVING LOG
--------------------------------------
Project:        BY019B
Observer:       Yuan, C.
Project type:   VLBA
Obs filename:   by019bcrd.*
Date/Day:       2005FEB23/054
Ants Scheduled: SC HN NL FD LA PT KP OV BR MK

=UT-Time===Comment===============================================MF#===%AD==AMD=
           Operator is Sonja Mendoza.                                           
           LA using MarkV disc pack NRAO-050, bank B.                           
           KP using MarkV disc pack NRAO-048, bank A.                           
           Vclock, GPS delta, and UT1-UTC time checks all ok.                   
          %HN WEA: Snow in dish.                                                
     0759  Begin observation.                                                   
     0827  PT WEA: precipitation starting.                                      
     0917  Readback check ok.                                                   
     0925  Readback check ok.                                                   
     0935  Readback check SC only ok.                                           
     0951 %PT Tape drive 1: Drive one appeared to be                            
           unloaded, as if it had lost vacuum. Reloaded the                     
           drive. When drive 2 tape was full, the observation                   
           properly switched to drive 1. However it appears to                  
           have started writing on track 3 instead of track 1,                  
           and the checker states that it doesn't know what                     
           tape is mounted. UPDATE: Confirmed with site tech                    
           tape VSN is SVLB0297. Tape was a fresh tape.                         
     1040  Readback check ok.                                                   
     1150  Readback check ok.                                                   
     1310  SC WEA: Light scattered low clouds, dry.                             
1316-1325 *BR Recorder #2 is unusable. Site tech is on site      15745  100    9
           to put up a new tape on recorder #1. Data will be                    
           lost during the transistion.                                         
     1340 %HN WEA: low, broken clouds; snow in dish.                            
     1345  FD WEA: Scattered cumulus, dry.                                      
     1356  Readback check SC only ok.                                           
1358-1408 *PT Run out of tape, trying to switch to drive         REC    100   10
           2. Have already contacted site tech who is enroute                   
           (delayed by snow/ice on roads).                                      
     1443  LA writing to MarkV disc pack NRAO-062, bank A.                      
     1445  New operator is Jim Ogle.                                            
     1449  BR reports clear skies.                                              
     1453  End at SC.                                                           
     1454  KP reports broken low clouds.                                        
     1459  End.                                                                 


Downtime Summary:
	Total downtime : 19 min
	Percentage downtime of observing: 0.5%
	Average downtime per hour : 0.3 min

    Total scheduled observing time (# Antennas): 4200 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.