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lbaops:lbafeb2009:vx014b [2010/03/17 18:53]
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lbaops:lbafeb2009:vx014b [2015/12/18 16:38]
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-VX014B is the second polarisation test. See [[lbaops:​lbamar2008:​vx014a|VX014A]] for the details and the results from the first. 
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-===== vx014b Setup: ===== 
- 
-^Description ​       | Pol test sched | 
-^Antennas ​          | At-Cd-Ho-Mp-Pa | 
-^Start ​             | 56 01:​00:​00 ​  | 
-^Stop               | 56 11:​00:​00 ​  | 
-^PI                 | Richard Dodson | 
-^Channel 1          | ''​ IFP#1-LO 6642 - 6658 MHz USB RCP  ''​ | 
-^Channel 2          | ''​ IFP#1-HI 6658 - 6674 MHz USB RCP  ''​ | 
-^Channel 3          | ''​ IFP#2-LO 6642 - 6658 MHz USB LCP  ''​ | 
-^Channel 4          | ''​ IFP#2-HI 6658 - 6674 MHz USB LCP  ''​ | 
-^Skyfreq ​           | 6658.00 MHz | 
-^Bandwidth ​         | 16 MHz         | 
-^DAS Mode           | vsop.pro ([[http://​www.atnf.csiro.au/​vlbi/​dasmodes/​16-2IF-1p-d.html|telescope]]) | 
- 
-Ftp: [[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​vx014/​vx014b]] 
----- 
- 
-===== Comments: ===== 
- 
-===== Observing comments for each antenna: ===== 
- 
-| [[.:​vx014batlog | At]] | [[.:​vx014bcdlog | Cd]] | [[.:​vx014bholog | Ho]] | [[.:​vx014bmplog | Mp]] | [[.:​vx014bpalog | Pa]] | 
----- 
-===== Observing Logs ===== 
-[[http://​www.atnf.csiro.au/​cgi-bin/​vlbi/​parkes-onsource.pl?​session=Feb2009&​start=56/​01:​00:​00&​end=56/​11:​00:​00| Parkes onsource flagging]]\\ 
-[[http://​www.atnf.csiro.au/​cgi-bin/​vlbi/​atca-onsource.pl?​start=56/​01:​00:​00&​end=56/​11:​00:​00&​year=2009| ATCA onsource flagging]]\\ 
-[[http://​www.atnf.csiro.au/​cgi-bin/​vlbi/​mopra_onsource.pl?​exper=vx014b| Mopra onsource flagging]]\\ 
-[[http://​www.atnf.csiro.au/​cgi-bin/​vlbi/​mopra_tsys.pl?​exper=vx014b&​plot=0| Mopra Tsys]] 
-([[http://​www.atnf.csiro.au/​cgi-bin/​vlbi/​mopra_tsys.pl?​exper=vx014b&​plot=1|plot]]) 
- 
----- 
- 
-ACTION 5a: Results of tests in Feb 09 (Richard/​Tasso). ​ 
- 
-VT11: I tested whether any noticeable difference could be found between continuous CLCAL and CLCAL on a 1 minute average looking at a (single) strong source. Nothing detectable. ​ 
- 
-VX014B: I tested continuous CLCAL with a 1 minute average looking at multiple strong sources. Solutions are averaged over 1 minute, whether there was a source change or not. This can be bad if there are large slews between C coded sources (as here). See [[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​incoming/​1934-638_phases.1scan.ps|plot]] of 1934-638. Early solutions are bad, and the correction is not helpful. One can see the timescale of the corrections in this plot as well. On the plus side this behaviour is good for phase referencing as it allows corrections which span the scans. ​ 
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-V255D/E: No continous CLCAL run.  
- 
-V255D: See [[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​incoming/​v255d.ph.ph_refs.ps|plot]] which shows the phases of the phase reference sources. A fair bit of wander is there, but it is not disastrous. ​ 
- 
-V255E: See [[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​incoming/​v255e.1755-22.ps|plot of 1755-22]] and [[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​incoming/​v255e.1808-21.ps|plot of 1808-21]]. The former shows the calibrator I had included for correcting the phases. I believe Tasso did phase up on this occasionally?​ It shows a pretty stable solution. Compare it to the latter, one of the phase references. ​ 
- 
-Conclusions. ​ 
- 
-CLCAL continously,​ if the sources are suitable. If they are not one can get as good result with one nearby source visited hourly. Distance sources would not be good.  
----- 
- 
-[[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​incoming/​CEDUNA_ODD.PS | Solution rates as a function of Hour Angle.]] This would have helped to diagnose the problem, if it had been correlated in a reasonable time. 
- 
-Results from LPCAL 
- 
-[[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​vx014/​vx014b/​0420.DOPOL.VPLOT.jpg | VPLOT showing post and pre LPCAL cal corrections]] 
- 
-[[http://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​vx014/​vx014b/​LPCAL.sol.ABS.ps | Absolute (average) values of D-term corrections,​ for IF-1 (blue) and IF2 (red)]] 
- 
-[[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​vx014/​vx014b/​LPCAL.sol.RMS.ps | RMS values of D-term corrections,​ for IF-1 (blue) and IF2 (red), for the 6 calibrators]] 
- 
-[[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​vx014/​vx014b/​LPCAL.sol.IF1.ps | Plot showing the solutions for IF1. Different colours for the 6 calibrators]] 
- 
-[[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​vx014/​vx014b/​LPCAL.sol.IF1.ps | Plot showing the solutions for IF2. Different colours for the 6 calibrators]] Note that IF2 is not nearly as nice as IF1.  
- 
-[[ftp://​ftp.atnf.csiro.au/​pub/​people/​vlbi/​vx014/​vx014b/​0834-201.pol.vx014b.ps | Polarisation map of one of the sources]] Others in the same place. ​ 
- 
- 
  
lbaops/lbafeb2009/vx014b.txt · Last modified: 2015/12/18 16:38 (external edit)