Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

PROPAGATION CHARACTERISTICS 87In order to solve the problem of the effect of fading on frequencymodulation, oscilloscopic wave form and aural program observationswere made on the tone and program modulation after it had traversedthe radio circuit from California to New York. In this manner theinstantaneous harmonic distortion could be observed.The diversity problem was answered by applying the outputs oftwo receivers, fed by spaced antennas, to opposite oscilloscope plates.Hence, by proper interpretation of the Lissajous figures obtained, therelative phases and amplitudes of the two outputs could be determined.The TransmitterTo obtain the frequency modulation, a circuit of the type shown inFig,' 1 was employed. This type of modulator was used as the master'-