INTERFERENCE SUPPRESSION STUDIES. STUDIES OF TRANSMITTER BANDWIDTH LIMITING AND SPURIOUS OUTPUT SUPPRESSION.
PENNSYLVANIA UNIV PHILADELPHIA MOORE SCHOOL OF ELECTRICAL ENGINEERING
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A review of existing techniques for reducing intermodulation and harmonic distortion in radio transmitters is given. These techniques include linearization of amplifier stages by proper choice of tubes, tube design and operating point, the use of negative feedback and predistortion of the signal to be amplified. Filtering was not considered in this study. It is shown theoretically that distortion can be reduced by multiphase amplifier techniques. This was checked experimentally on a three phase amplifier at audio frequencies. The technique can be used at higher frequencies if the wide band phase splitting networks can be designed. Author