A Heterodyne Near-Zone Field-Strength Meter

This paper describes a tunable field-strength meter covering the 12-30-MHz range, which can be used to measure electric intensities from 0.1 to 1000 V/m in the near zone of an antenna with an estimated uncertainty of ±2 dB. The use of high-resistance plastic telemetry lines enables the field to be probed without disturbance, while a novel detector circuit and meter enable a 40-dB display with minimal reading error. Laboratory and field test data on the device are presented.