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147-cps signal adjusted alignment AMPLIFIER amplitude amplitude modulation antenna audio ampliﬁer audio channel audio frequencies AVC voltage band bandwidth battery block diagram capacitance carrier cathode bias ceiver channel pulse circuit diagram coil communications receiver components connected control grid coupled crystal ﬁlter current ﬂows cycles deﬂection detector deviation diode electrons equipment ﬁdelity ﬁrst ﬁxed frequency modulation grid circuit headset heterodyne high frequency impedance indicator inductance input intermediate frequency limiter magnetic ﬁeld maximum mixer modulation index noise operation pentode phase plate voltage position potentiometer power ampliﬁer provides quency radio range ratio rectiﬁer relay resistor response resting frequency 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 troubleshooting tuned circuit unit variable capacitor varies VHF and UHF voltage drop volume control waveform