Short wave direction finder - derives output signals for left and right rotating polarisation for comparison at same time from two different antennae

摘要

Several antenna elements (1,2) are switched between left and right rotating polarisation directions. A level comparison device (7) compares the signals for the two polarisation rotations, allowing the highest level to be selected for evaluation. The level comparison device compares the output signals for left and right polarisation rotation obtained simultaneously from two different antenna elements. ADVANTAGE - Copes with transmission signals with gaps or telegraph codes.