The observed 50-90 Kmc attenuation of two inch improved waveguide

A new measuring technique particularly suited to the measurement of low loss waveguide lines is described. Some measured results which employ this new technique are given for theTE_{01}transmission loss with two inch improved waveguide. Both the average loss and the random fluctuations over the 50-90 kmc band are low. The observed data obtained with long lines, one of solid copper and one all-helix waveguide, is presented.