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Abstract

A frequency control system is provided for controlling the radio frequency of a mechanically tuned coaxial magnetron under a wide variety of environmental conditions by initially tuning the magnetron according to resident tuning data and in response to a received frequency command signal, directly measuring the frequency of the magnetron output, comparing the frequency command signal with the actual frequency of each of a series of sampled output pulses, modifying a dynamically adapting calibration function according to any differences found during the comparison, retuning the magnetron according to the modified calibration function, and repeating the process to maintain the magnetron output frequency in agreement with frequency command signals. The coefficients of the calibration function converge to an optimum set of values within a few pulses. Frequency offset can be effectively corrected with the measurement of one pulse; and other frequency control characteristics, such as slope and nonlinearity, can be corrected with the measurement of but a few more at different frequencies.

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First Claim