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actually amplifier amplitude amplitude modulation angle anode circuit anode current arrangement array audio-frequency carrier wave cathode Chapter characteristic impedance coil condenser considerable crystal diameter dielectric direction distance diversity reception dynamic resistance earth effect electric wave Electron Oscillators electrons energy field strength Frequency Changer frequency modulated half a wavelength half-wave aerial high frequencies impedance increase input intermediate frequency ionized Journal I.E.E. kc/s layer length lines of force loss magnetic field maximum Mc/s metres micro-waves Miller effect modulation frequency normal obtained ohms operation oscillating circuit output phase plane of polarization possible practice produced quency radiation radio reactance receiving aerial reception reflection reflector resistance resonance short waves short-wave shown in Fig side frequencies side-bands signal similar simple spacing standing waves suitable tion transmitter triode tuned circuit ultra-short waves upper atmosphere usually valve variation varies voltage wavemeter wire wireless waves zero