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lbaops:lbamar2011:vt13egmlog [2011/04/20 14:45]
gmrt
lbaops:lbamar2011:vt13egmlog [2015/12/18 16:38]
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-Good data from 04:46 UT onwards 
- 
- 
-failure of the main communication links from the control computer to the 
-antennas, and no commands are going to the antennas.  This happened at 
-~ 06:30 UT, just about the time the cycle on the two sources J2225-0457 & 
-J2218-0335 came to an end, and the one on J2348-1631 & J2354-1513 was to 
-begin 
----------------------------------------------------------------------------- 
- 
-                   Observing Log for VLBI test of 8 Mar 2011 
-                   ------------------------------------------ 
- 
-Participating telescopes : GMRT + ATCA + Mopra  
- 
-Configuration at start of expt : 
-RF band = 1390,   LO-I = 1330,   LO-IV = 60,   LO-V = 140 (& 165),   IF BW = 16 
- 
-Test on 3c468.1 : fringes seen on all working antennas ; weak fringes on C03. 
- 
-Antennas selected for VLBI experiment : C00, C01, C02, C04, C05, C06, C08 
-(note : C04, C05, C06, C08 connected to BB monitor port o/p (both pols) 
- 
-0x:xx : Fringes still seen on ALL working antennas in GSB, except C08 !!   
-no LTA file recorded !!  
- 
-Slew to source 2253+1608 : need to go from outer to inner ==> 10 mins delay !! 
-Fringes seen in GSB. 
- 
-Meanwhile, checked disk mounting and remounted the data recording disks. 
- 
-Stopped real-time mode of GSB : hltndas.gsb 
- 
-Started raw-dump mode and did a short test : 09:57:00 onwards, for 100 blks 
- 
-Ready to start actual run : already about 30 mins behind the schedule ! 
-==> edited the cmd file accordingly to drop some of the initial pointings 
- 
-Sources to be done today are (all are being taken from main GMRT source list) : 
- 
-J2253+1608  (named 2253+161 in the GMRT source list)  10 Jy @ 20 cm; UVMax 7 kL 
-J2218-0335  (named 2218-035 in the GMRT source list) 1.0 Jy @ 20 cm; no UVlimits 
-J2225-0457  (named 2225-049 in the GMRT source list) 5.7 Jy @ 20 cm; UVMax 45 kL 
-J2348-1631  (named 2348-165 in the GMRT source list) 2.7 Jy @ 20 cm; UVMax 15 kL 
-J2354-1513  (named 2354-152 in the GMRT source list) 1.0 Jy @ 20 cm; UVMax 30 kL 
- 
-changed # of blocks in run_rawdump.csh of readSHM to 7200 (for 30 mins). 
- 
-Recording #1 :  
-  start at :  2011 03 08 09 59 00 ;  stopped at : 10 24 00 
-  raw_voltage1.vlbi_8mar_1.node0.scan0  
-   
-  should have been on 2253+1608 since the beginning, but had problems with  
-  the cmd file and had to fix things (cmode 0 vs cmode 1 -- latter needed 
-  for fixed time command execution !!) 
- 
-  finally, useful data on 2253+1608 is only from 10:12 or so onwards ! 
-    
-  first change of source in sync with schedule is at 10:16:00 to J2225-0457 
-  after that things are in sync... 
- 
-  typical settling time for the antennas to be on source is 30 sec ==> good 
-  data can be said to be available from 30 sec from nominal start minute, 
-  for each scan. 
- 
-  killed at 10 24 00, at end of scan on J2218-0335 
- 
-Recording #2 : 
-  start at :  2011 03 08 10 25 00 ;  stopped at : 10 53 30 
-  raw_voltage1.vlbi_8mar_2.node0.scan0  
- 
-  reached on source (J2253+1608) at 10:27:00 but immediately had problems  
-  due to changes made in cmd file !!  
-  fixed and restarted cmd file ; back on source (J2253+1608) at 10:29:30  
-  ==> 4.5 mins of good data till change of source to J2218-0335 
- 
-  killed at 10:53:30  (while on J2218-0335 scan) 
- 
-Recording #3 : 
-  start at :  2011 03 08 10 54 00 ;  stopped at : 11 24 00 
-  raw_voltage1.vlbi_8mar_3.node0.scan0  
- 
-  first source is J2225-0457 (usual 30 secs safe time from min value) 
-  last source is J2253+1608 (stop is in the middle of this scan) 
- 
-Recording #4 : 
-  start at :  2011 03 08 11 28 00 ;  stopped at : 11 58 10 
-  raw_voltage1.vlbi_8mar_4.node0.scan0  
- 
-  first source is J2218-0335 (on src is 50 secs after start!) 
-  last source is J2225-0457 (stop is in the middle of this scan!) 
- 
-Recording #5 : 
-  start at :  2011 03 08 12 00 00 ;  stopped at : 12 31 10 
-  raw_voltage1.vlbi_8mar_5.node0.scan0  
- 
-  first source is J2218-0335 (on src is 30 secs after start) 
- 
-  at around 12:05, commh system failed ==> no commands going from  
-  online to antennas !! 
- 
-  last source is .....  
- 
-  observation aborted;  took about 1 hour of debugging for the problem to be  
-    identified and fixed.  Resumed observations from 13:14 onwards. 
- 
-Recording #6 : 
-  start at :  2011 03 08 13 14 00 ;  stopped at : 13 30 30 
-  raw_voltage1.vlbi_8mar_6.node0.scan0  
- 
-  first source is J2354-1513 (already on src at start!) 
-  last source is J2348-1631 (stop afer end of the scan) 
- 
-Observing run over !! 
- 
-=============================================================================== 
- 
- 
  
lbaops/lbamar2011/vt13egmlog.txt · Last modified: 2015/12/18 16:38 (external edit)