Recording to ATNF V015B
|01:57||pre-start cacal phase|
|02:00||onsource tied C12345|
Phase drifting relatively fast. Weather?
03:40 scan on 0252-474 shows rapid phase variation and amplitude dips. Seemon shows path noise has shot up to 2000 microns over the last ~10 minutes from ~500 microns, so atmospheric turbulence (usually worst in a diurnal sense at around this time of day) is the cause.
05:50 phase stability continues to be poor, so “untie” the array and keep only CA04 in the tied array.
05:57 concensus that tying 1 and 4 will be okay! So change catie and change correlator logging accordingly.
21:01 UT: stop during slew between sources to take CA06 out, then restart. (No impact on the VLBI observing, but note it here for the record.)