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NOISE is the specification for each IF of the switching mode of the noise cals on the VLBA. The usual for VLBI is 'low-s' which means that the low noise cal, about 3 K, is switching continuously at 80 Hz for continuous system temperature measurements, while 'low-c' means low continuous. 'high-s' and 'high-c' are the same requests for the high (solar) cals; beware that most receivers do not have solar cals.

This has no effect on the VEX file.

Craig Walker 2014-04-14