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12 and study amateur bands amateur operator Amateur Radio amateur service amateur station amperes amplifier AMTOR ARRL audio autopatch basic unit battery call sign capacitance capacitor Chapter 12 circuit coaxial cable coil communications conductor connect control operator device diagram dipole driven element electrical electrons energy equipment exam feed line Figure filter frequency ground harmonics impedance inductance inductor insulating interference ionosphere keyer layer license maximum messages mode modulation Morse code Novice ohms oscillator packet packet-radio plates polarized power supply propagation radiation radio amateurs radio waves radioteletype receiver repeater resistance resistor Review this section RTTY sideband Subelement switch SWR meter Technician teleprinter transceiver Transmatch transmission transmitter tubes tuning turn to Chapter VHF and UHF VHF/UHF voltage volts W1AW watts PEP output wavelength wire Yagi Yagi antenna