Microwave phase calibration - generalities

•Baseline redundancy
–May be useful
–By itself, cannot meet requirements
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•Conventional approach
–Reasonable, but not heroic measures to stabilize system phase
–Add 1 or 2 large antennas for non-solar calibrations
–Interrupt solar observations every hour or two to recalibrate
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•Comments on conventional approach
–Cost of large antennas is equivalent to many small antennas
–Interruptions degrade solar science
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