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On the VLA, a SCHED scan intended for array phasing is broken into subscans for purposes of obtaining phasing solutions at one solution per subscan. At least 4 subscans are required to obtain reliable phases. The length of the subscans can be set separately for each scan using VLAPTIME whose argument is in integer seconds. The default of 10 seconds will be good in most cases. Longer times can be used if a weak calibrator must be used or perhaps when phasing while recording on the VLBI target source. The subscan length is passed to the VLA through the VEX file in an INTENT that is created by SCHED.

Craig Walker 2014-06-17