Exalted-Carrier Amplitude- and Phase-Modulation Reception

An amplitude- or phase-modulation receiving system is described in which the harmonic distortion produced by fading of the carrier with respect to the sidebands is eliminated. The various parts of such a receiver, including the carrier filter, automatic-frequency-control discriminator, and detecting systems, are described. Analyses are given of the selectivity effect due to carrier exaltation and of exalted-carrier diode and multigrid detection. The optimum degree of carrier exaltation and the effect of carrier limiting are discussed. Results are given of observations of reception on an exalted-carrier diversity receiving system.