Lecher wire wavemeter

A Lecher wire wavemeter is an instrument used to determine the frequency of an electromagnetic wave. It consists of a pair of parallel wires, known as Lecher wires, which are adjusted in length. Standing electromagnetic waves form along these wires, and the position of their nodes and loops allows for frequency determination.12

This device is particularly useful for measuring higher frequencies. In a Lecher wire wavemeter, a sliding short circuit is employed. By identifying two points where this short circuit results in maximum signal absorption, a distance equivalent to half a wavelength can be measured directly. The instrument is named after Ernst Lecher, an Austrian physicist.12