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This paper discusses RF calibration schemes for coaxial one-port vector network analyzers other than the traditional short-open-load approach. Before use, the calibration standards are characterized by fitting polynomials to measured voltage reflection coefficient values. Simulated uncertainty profiles and example measurement uncertainties are presented for various calibration schemes. Examples of nonSOL schemes and a method of adaptively choosing the best calibration scheme, based on minimizing the uncertainty of measurement, for a particular device at a particular frequency are also presented.