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B.7. Changing Correlator Configs

Changing CABB modes is not (yet) simply a matter of selecting the desired mode in the CABB scheduler. (In fact, currently you cannot select a mode in the CABB scheduler.) Nor can you select a mode in the CACOR gui and hit the config button, this has intentionally been disabled.

To change modes it is necessary to:

  • stop the current scan

  • check the cccversion

    To check the cccversion: caccc> cccversion. It should be “newzmsy” for all modes except VLBI and “VLBItwommlos” for VLBI observing.

  • in cacor, open the edit menu

    select the edit button in the cacor gui,

    • select the appropriate config

      edit> get <config-name>

    • and program the correlator

      edit> prog

      Check that all blocks program correctly. If any blocks report an error, they need to be programmed again, e.g.:

      edit> prog 8 or edit> prog 8 27

    • if you are having problems with a block you can try

      edit> prog N cal which just reprograms the calibration (sometimes works)

    • <CR> to return out of the edit menu

  • If required (64MHz modes), set calbands, e.g.

    cacor> calband z z (z for zoom)

    NOTE: calband resets to the default (f f) every time you exit from the edit menu

  • start observing a strong calibrator, e.g.

    caobs> track 1

  • Check for rear transition module (rtm) problems

    F1 and F2 Datalinks (separate tabs in the CACOR gui) should not have red error messages, and the 1ms values are in the range 2000 - 13000 (i.e. not 260 000). Fix with:

    cacor> rtminit

  • Check (in spd) for “big humps”

    F1 and F2 datalinks list the antennas, frequencies (1 or 2) and pols (A or B) and the block associated with that ant/freq/pol. Reprogram that block to fix big humps.

  • Check (in spd) individual baseline amplitudes and phases for discontinuities and fix by reprogramming relevant blocks

  • Setup standard flagging

    NOTE: all flagging is cleared every time you exit from the edit menu

  • Check that tvch is set to appropriate values

  • Check that delavg is set to an appropriate value

  • Standard setup follows (i.e. check sampler levels, and for fringes, then dcal, acal, pcal etc.)