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accuracy aerial noise airborne aircraft amplitude angle of elevation anode aperture approximately array azimuth band width beam width beam-switching calibration cathode-ray tube centimetre centre Chain Home Chapter circuits clutter coils conical scan constant coordinate detection determination dipole direction direction-finding display echoing area effective elevation-finding Engrs equation example field strength formula frequency gain give goniometer ground stations half-wave aerial height Helical scanning horizontal Instn Elect isotropic limit maximum range Mc./sec measurement method miles modulation noise factor noise temperature normal obtained oscillator perception factor phase plan position indicator plane propagation pulse repetition frequency radar equipment radar station radial velocities radiation radio receiving aerial reflector reflexion coefficient refractive index responder result rotating scattered search radars secondary radar sender power sending and receiving signal strength surface switching target usually valves velocity velocity of propagation vertical polar diagram voltage wave form wave-lengths