User Tools

Site Tools


lbaops:lbamar2012:vt13fgmlog

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

lbaops:lbamar2012:vt13fgmlog [2015/12/18 16:38] (current)
Line 1: Line 1:
 +                   
 +
 +                   ​Observing Log for VLBI test of 1 Mar 2012
 +                   ​-----------------------------------------
 +
 +Participating telescopes : GMRT + Hobart + Mopra 
 +
 +Initial configuration done by Operator (Nilesh) :
 +  rotate feeds to L-band (already at L-band); ​ configure for standard ​
 +  1390 band and do pointing (already done);  ​
 +
 +Configuration at start of expt :
 +RF band = 1390,  LO-I = 1330,  LO-IV = 60,  [LO-V = 140 (& 165)], ​ IF BW = 16
 +Note : LO-V not used in this default set-up..
 +
 +Used 3c286 to check for fringes with real-time correlator (GSB in 16 MHz,
 +256 ch, total I mode) : fringes seen on all antennas in GSB, except C12, W02
 +(both having LO-I unlock) and E02 (servo problem).
 +GSB connections : as per normal settings for all antennas.
 +
 +Stopped real-time mode of GSB : hltndas.gsb
 +Started raw voltage recording mode (as per instructions in SoP)
 +
 +Did a couple of short runs of 100 blks to test the set-up.
 +
 +Changed IF BW to 6 MHz for C01 and C02
 +
 +Sources to be done today are from this list (all are 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
 +
 +Move to VLBI source # 1 : J2253+1608 ​ (named 2253+161 in the GMRT source list)
 +
 +Restarted real-time mode of GSB 
 +Checked fringes in real-time correlator -- OK, including 6 MHz BW of C01 & C02
 +
 +Changed back to raw voltage dump mode
 +
 +VLBI scan #1 :  on source 2253+161 for 10 mins
 +  start at :  2012 03 01  09 32 09 ;  stopped at : 09 42 12 
 +  original files : raw_voltageY.vlbi_1mar12_1.nodeZ.scan0 ​
 +  snippet files : vlbi_1mar12_1.CXX-R ​
 +
 +Changed 130 pol GSB connection of C06 and C09 to baseband signal derived
 +from broadband RF path, by using LO @ 1390 and BB ampl + filter of 16 MHz BW
 +
 +Restarted real-time mode of GSB and checked fringes -- looked OK, though some 
 +evidence of phase fluctuations was seen...
 +
 +Changed back to raw voltage dump mode
 +
 +VLBI scan #2 :  on source 2253+161 for ~8 mins
 +  start at :  2012 03 01  10 09 08 ;  stopped at : 10 17 09 
 +  original files : raw_voltageY.vlbi_1mar12_2.nodeZ.scan0 ​
 +  snippet files : vlbi_1mar12_2.CXX-R ​
 +
 +Changed Rb to new unit 
 +
 +VLBI scan #3 :  on source 2253+161 for ~10 mins
 +  start at :  2012 03 01  10 22 10 ;  stopped at : 10 32 13 
 +  original files : raw_voltageY.vlbi_1mar12_3.nodeZ.scan0 ​
 +  snippet files : vlbi_1mar12_3.CXX-R ​
 +
 +Changed C10 connections such that one copy of C10 130 IF is given to 5th LO
 +mixer and BB output connected to C11.   LO-V values were set to 140 and 165, 
 +as listed in the beginning.
 +
 +Changed Rb back to old unit
 +
 +Restarted raw dump mode 
 +
 +VLBI scan #4 :  on source 2253+161 for ~3 mins
 +  start at :  2012 03 01  10 57 04 ;  stopped at : 10 59 55 
 +  original files : raw_voltageY.vlbi_1mar12_4.nodeZ.scan0 ​
 +  snippet files : vlbi_1mar12_4.CXX-R ​
 +
 +Changed source to J2218-0335 ​ (named 2218-035 in the GMRT source list) :
 +    ​
 +VLBI scan #5 :  on source 2218-035 for ~8 mins
 +  start at :  2012 03 01  11 02 30 ;  stopped at : 11 09 22 
 +  original files : raw_voltageY.vlbi_1mar12_5.nodeZ.scan0 ​
 +  snippet files : vlbi_1mar12_5.CXX-R ​
 +
 +Changed source to J2225-0457 ​ (named 2225-049 in the GMRT source list) :
 +
 +VLBI scan #6 :  on source 2225-049 for ~8 mins
 +  start at :  2012 03 01  11 10 13 ;  stopped at : 11 18 52
 +  original files : raw_voltageY.vlbi_1mar12_6.nodeZ.scan0 ​
 +  snippet files : vlbi_1mar12_6.CXX-R  ​
 +
 +Changed source to J2348-1631 ​ (named 2348-165 in the GMRT source list)
 +
 +VLBI scan #7 :  on source 2348-165 for ~9 mins
 +  start at :  2012 03 01  11 21 34 ;  stopped at : 11 30 13 
 +  original files : raw_voltageY.vlbi_1mar12_7.nodeZ.scan0 ​
 +  snippet files : vlbi_1mar12_7.CXX-R ​
 +
 +Observing run over !
 +
 +===============================================================================
 +===============================================================================
 +
  
lbaops/lbamar2012/vt13fgmlog.txt · Last modified: 2015/12/18 16:38 (external edit)