MMA Memo #229

Some Comments on Instrumental Phase Calibration

A.R. Thompson, D.S. Bagri

September 18, 1998

Keywords: instrumental, phase, calibration

If we compare the requirements for instrumental stability in the MMA with those for the VLA with which we are familiar, two factors make the MMA case more difficult. (1) The maximum first-LO frequencies are higher by a factor of about 20. (2) Observations will be made with the MMA in which the calibrator measurements are at a different frequency from those of the target source. For example, calibrator observations near 86 GHz for target source imaging at, say, 650 GHz, for which certain phase errors would require a scaling factor of 7.6.

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Last modified: 09 December, 1999