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adjustment amplitude angle anode anode current anode voltage arrangement array attenuation beam capacity carrier carrier wave Chapter characteristic coil condenser conductor connected considered constant frequency coupling crystal curve cycles detector direction distance drive earth effect efficiency electric electrons energy envelope fading feed feeder field strength Figure filament grid circuit grid current half-wave aerial harmonic hence heterodyne high frequency horizontal impedance increase inductance input intermediate frequency ionised layer length load long wave loss magnetic Marconi maximum method metres modulation obtained ohms oscillator parallel percentage modulation polar diagram polarised Poldhu produced push-pull push-pull circuit radiation rays reactance receiver reflector resistance resonant circuit self-oscillator short wave band shown in Fig side band signal skip zone space stationary wave stations super-heterodyne supply telegraph telephone terminated transmission transmitter tuning ultra short waves valve vector vertical voltage volts wave aerial wavelength wire wireless zero