. QST . Fjg. I —The basic phase-shift oscillator circuit. The phase shift through the network at har-monic frequencies is always less than 180 degreesand in some cases approaches zero. This givesrise to negative feed-back which reduces the gainat harmonic frequencies; therefore, essentially apure sine wave results. Maximum harmonic re-duction occurs at the point where the system isjust able to sustain oscillation. General Circuit Description A single (j.\X8 tul)e is us;d as oscillator andoutput section for each channel of the pentode section functions as the oscillator The two-to
. QST . Fjg. I —The basic phase-shift oscillator circuit. The phase shift through the network at har-monic frequencies is always less than 180 degreesand in some cases approaches zero. This givesrise to negative feed-back which reduces the gainat harmonic frequencies; therefore, essentially apure sine wave results. Maximum harmonic re-duction occurs at the point where the system isjust able to sustain oscillation. General Circuit Description A single (j.\X8 tul)e is us;d as oscillator andoutput section for each channel of the pentode section functions as the oscillator The two-tone test genera-tor is a compact and inex-pensive unit and providestwo audio signals of differentfrequencies and equal ampli-tudes for testing any typeof generator. Distortionis extremely low if proper careis used in May 1955 33
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
