A direct-reading wattmeter is described which uses a directional coupler and one or more thermocouples to monitor the power transmitted by a wave guide or a coaxial transmission line. It was used in connection with a 1000-watt magnetron transmitter which had a tuning range of 8 to 12 centimeters, and the calibration was substantially constant over this range.
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Harold C. Early (1946) studied this question.