Experimental Polyphase Broadcasting

An experimental installation of polyphase broadcasting is described using 1000 watts carrier power on a frequency of 1000 kilocycles. Fidelity measurements made of the modulated field intensity radiated from this installation indicate that comparable performance to other present-day amplitude-modulated broadcast transmitting equipment can be obtained readily. It is demonstrated that transmitting equipment of this type need only have a peak power capability of the output tubes approximately 1½ times carrier power.