IMPROVEMENTS RELATING TO THE OUTPUT POWER DERIVED FROM PHASE MODULATING

摘要

A phase modulator according to the invention includes means for producing quadrature components of a carrier wave each phase reversal modulated by respective digital pulse signals, means for applying the components to respective adjacent terminals of a four terminal hybrid coupler, and means responsive to the digital pulse signals for selecting the appropriate one of the other terminals of the coupler to derive an output therefrom equivalent to the resultant of the quadrature components of the carrier wave.