The Model 43 THRULINE Directional Wattmeter accurately measures forward or reflected power in coaxial transmission lines under any load condition. Each Model 43 consists of a line section, ""QC"" (Quick Change) Connectors type N female and an indication meter housed in a rugged, corrosion-resistant aluminum case. The line section is a high-precision 50-ohm coaxial air line that inserts between the transmitter and the antenna or load. A socket is provided in each line section for a plugin element with the desired power rating and frequency range. Line section ends are equipped with ""QC""-type connectors.
7/8"" Plug-In Elements are calibrated in accordance with meticulous Bird calibration procedures supported by a long history of mean deviation values to assure adherence to advertised specifications of current instruments, as well as field interchangeability with equipment purchased, used and trusted in all the years since its introduction.