Single-Sideband Transmission by Envelope Elimination and Restoration
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A new type of single-sideband transmitter is described which does not require the use of linear radio-frequency amplifiers. Amplification is accomplished by a process in which the phase-modulation component of the single-sideband wave is amplified by means of Class-C amplifiers, and the amplitude envelope is restored at the final amplifier. Experimental results show performance equal to or better than conventional linear radio-frequency amplifier practices. The over-all efficiency is approximately the same as that of a double-sideband amplitude-modulated transmitter. This system is especially suitable for high-power operation.
[1] N. F. Schlaack,et al. A Single Side-Band Short-Wave System for Transatlantic Telephony , 1935 .