The design and performance of a circuit to measure the tuning error of single-side-band radio receivers
Jones, David Allan
Myers, Glen A.
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In order to automatically tune a single-sideband (SSB) radio receiver to the carrier frequency of a voice-modulated, suppressed-carrier, single-sideband radio signal, the difference between the frequency of the suppressed carrier and the frequency of the local oscillator in the receiver must be determined. A circuit which generates a sinusoidal voltage of the same frequency as the tuning error is examined analytically and experimentally. The design of the circuit is based on the principle that vowel sounds in human speech are periodic. The inputs to the circuit are the audio output of the SSB receiver for which the tuning error is desired and the audio output of an envelope detector which amplitude demodulates the SSB radio signal. The envelope detector provides a reference signal which is a harmonic of the fundamental modulating frequency of the SSB radio signal. This reference signal and the SSB receiver audio are non-linear processed to generate the error voltage. Receiver tuning errors as small as 0.1 Hertz were measured using this circuit.
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