Pie Town Link M. Claussen says that relative LO drifts should cancel if we set the LOs such that the sky frequency is the same as the frequency in the IF transmission system. Observing this way still exhibits long-term phase drifts which are not understood. There is a problem with the blanking system. A half hour integration on blank sky shows splattered power about ten times thermal with the long delays invoked. The first try at extending the blanking time to cover the transmission time through the delay system did not quite get all of the invalid data.
More work is necessary.
Pointing C. Carilli looked in more detail about how to do reference pointing. He tracked pointing over a 90 minute period. In the end, CC recommends that pointing every 30m is a reasonable generalization. Meeting time Wednesday is the usual VLA maintenance day. Another time would let people concerned with hardware attend.