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 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.)