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Acorn valves aerial amplitude change amplitude modulation amplitude variation angle swept anode circuit audio frequency carrier component carrier frequency carrier vector cathode centre tap coil condenser constant conversion efficiency coupling curve damping resistance decoupling desired signal detector diagram diode directly proportional distortion feedback frequency and phase frequency changer frequency deviation frequency modulated wave frequency modulation receiver frequency response grid input resistance grid leak harmonic hexode I.F. amplifier increased input voltage intermediate frequency kc/s mA/volt maximum Mc/s modulated carrier modulating frequency modulating voltage modulation index mutual inductance negative noise obtained off-tune frequency oscillator frequency output voltage overall parallel resistance pass band peak phase discriminator phase modulation primary and secondary Proc push-pull quency R.C.A. Review R.F. valve Radio reduce resonant frequency resultant secondary circuit shown in Fig sideband vectors signal-to-noise ratio single tuned circuit transformer transmitter ultra high frequency unmodulated value variable reactance valve volts Wireless Engineer x/xF zero