Antennas

摘要

The discussion on the three-meter impedance instrument and the BASIC program for converting the scalar voltage measurements to impedance created much interest. This method of measuring impedance was first described in [1] way back in 1965. I made my first three-meter instrument in 1970 and used it extensively using the prescribed method of converting the voltage readings to impedance with the graphic method described below. At the time, the only instrument for measuring impedance in use by amateurs (those not able to lay their hands on a commercial bridge) was the noise bridge, the design of which, in those days, allowed only the measurement of the resistive component of impedance. The three-meter instrument was also described in RadCom in 1987 [2].