The relative merits of presentation of bearings by aural-null and twin-channel cathode-ray direction-finders

The relative merit of the display of radio bearings and sense by aural-null and twin-channel cathode-ray goniometers has been examined as a function of various characteristics of the signal. The visual method of bearing display has been shown to be superior in nearly all respects except for its relative ineffectiveness in operating at very low signal/noise ratios. It has been shown quantitatively that this disadvantage is slight and could be overcome by a suitable narrowing of the receiver bandwidth. The advantage of the visual method is specially pronounced when the signal received includes an appreciable phase-quadrature component. Similar conclusions have been reached regarding the performance of the associated methods of sense display.