Recovery and Recalibration after Antenna Reconfigurations

Initialise

Ensure that the baseline information from the previous array xbones:/atomsexport/caobsonline/caobs_init/station_errors.file is saved in that configurations's directory (/atomsexport/reconfig/yyyymmdd)
In an xbones terminal create a new directory for work files for this configuration: (/atomsexport/reconfig/yyyymmdd) and cd into that directory.
in caobs:
- caobs > reconfig array name (where name is the config name, in lower case)
  The configuration names are found in /atomsexport/caobsonline/caobs_init/configs.dat
  (check that this has gone through to caccc1 by checking in $ATCA_CONNECTIONS_FILE on caccc1
- caobs > corr reconfig clear (clears global delays and phase offsets)
- caobs> reconfig ppinit (reset az/el offsets to defaults for this station post/antenna)
- caobs> reconfig bszero (reset baseline offsets on xbones (baseline information needs to be reset in caccc1 as well - see below)
in a caccc1 terminal:
caccc1% ~/bin/ZeroBslErrors resets the global delays back to the default


         Create baseline tags on xbones with 

          xbones% bslntags and answering the questions
         In CABB, reconnect the digitisers to the correlator:

          Click on the EDIT box, 

	  type prog inst
         Drive to a strong calibrator source e.g. PKS1934-638
         Initialise the digitisers with:

          cabb> diginit all
         Check in the F1 and F2 Data Link tabs that the 1ms values are reasonable. 

          values to CA06 should be around 12000, other antennas should be around 2000
	  - proportional to the distance from the control building
         Reset the rear transition modules:

          cabb> rtminit all



      Once you get on source, check for fringes in  spd  (check in autocorrelations as well as cross correlations).
        Deal with problems before proceding. (One common error is that the LOs are not locked:
        caobs> stop, then
        caobs> track #  again will probably fix this.)


      Once you have a working system, calibrate the global delays - which may be off by ~100nsec, however, as long as they are         stable, they are fine.

Pointing
    
       Ensure catag is running.

      
 Check that catag is using all appropriate antennas, all IFs and that the number of cycles is 2 with:

        caobs > sho point_a(ntenna)  (usually should be 123456)

        caobs > sho point_p(attern)  (usually should be 2)

        caobs > sho point_if (usually should be 1234).

      
 Do the  Rough Pointing calibration 
        to remove the worst of the Azimuth encoder offsets.
      
 When you are happy with this, start a  
        Fine Pointing Run. 

        Remember to note the start record 
          of your pointing run.
      
 Process the data with  point_process
        
 You should only need to modify the ea, ax, ay and fx parameters. 
        
 (If there are any antennas which do not require the data to be 
          processed (e.g. CA06 after it hasn't been moved) it should still be loaded and 
          processed with all the parameters unset.)
        
 To check that the values you have just calculated have been entered, 
          compare the /pp page of camon with the values of param.dat
     
Baselines
    
       When the atmospheric phases are stablish (less than one turn in 
        the hour) solve for the  baseline errors.
    
   Check
    
       Check that you haven't stuffed up completely by doing a small
        pointing run with approximately eight sources in it. The phases should
        remain pretty constant whereever you are on the sky. The pointing 
        should have errors of less than 10 arc sec.
    
  
 Finished!!!
Go to sleep - unless you have something better to do.


     

    

    
      Original: Robin.Wark@csiro.au (11-JUN-1997)

      Modified: Vanessa.Moss@csiro.au (01-SEP-2019)