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adjusted amateur operator amateur radio operator Amateur Radio Service amateur radio station amateur station amplitude antenna application bandwidth call sign capacitance capacitor cathode coil Commission communications conductor control operator current flow cycle decibels detector diode dipole distortion effect effective radiated power electric field electrons element emission energy examination FCC Form feedback feedline filter gain grid signal half-wave harmonics high-pass filter impedance inductance inductor input signal load maximum measurement meter modulating signal modulation index normally ohms operator license oscillator output circuit peak peak envelope power permit phase plate current power amplifier produce quency questions radiation radio wave ratio reactance receiver rectifier reflected remotely controlled repeater operation resistance resistor RF amplifier sideband SSB signal stage standard station license superhet SZ/OOI telegraphy tion transformer transistor transmission transmitter tube tuned circuits vertical voltage watts waveform wire