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The virtual elimination of the carrier in single-side-band emission makes mandatory the accurate control of the frequencies used at the terminals of a single-sideband communications circuit. Independent, absolute frequency control of the receiver and transmitter provide immunity to propagation vagaries and interference which plague systems using partly-suppressed carrier and afc. Oscillators using high-frequency quartz resonators provide accurate and stable reference signals in small, rugged packages. A master oscillator, stabilized by phase comparison with signals derived from the reference oscillator, provide a multiplicity of accurate and stable channel frequencies.