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B.8. Changing to 1MHz, No Zooms

IMPORTANT: 1MHz continuum observations can be done with either: ca_2048_2048_2f or ca_2048_2048_2f_zm16 . If CABB is in the ca_2048_2048_2f_zm16 config do NOT reprogram for 1MHz (non-zoom) continuum observations.

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 continuum config

      edit> get ca_2048_2048_2f

    • 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

    • <CR> to return out of the edit menu

  • Calband should be “f f” as this happens automatically whenever you exit from the edit menu. This is what you need for this config, but you can check with:

    cacor> calband

  • 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

    cacor> fflag f1 birdies

    cacor> fflag f2 birdies

    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.)