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147-cps signal adjusted alignment ampliﬁer amplifier stages amplitude amplitude modulation antenna audio amplifier audio channel audio frequencies AVC voltage band bandwidth battery bias block diagram capacitance capacitively coupled carrier cathode ceiver channel pulse circuit diagram coil communications receiver components connected control grid coupled crystal filter cycles detector deviation diode electrons equipment ﬁdelity ﬁlter ﬁrst frequency modulation grid leak headset heterodyne high frequency impedance indicator inductance input intermediate frequency limiter maximum mixer modulation index noise operation pentode phase position potentiometer power amplifier power supply provides quency radio range ratio rectiﬁer relay resistor response resting frequency RF amplifier RF signal secondary selectivity shown sideband signal strength speaker squelch superheterodyne superheterodyne receiver switch sync pulse target plate teletypewriter tion transformer transmitter triode triode section tuned circuit unit variable capacitor varies VHF and UHF voltage drop volume control waveform