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accurate adjustment air speed aircraft altimeter altitude amplifier amplitude amplitude modulation antenna approximation audio automatic automatic gain control azimuth beat frequency beat-note bias bomb release calibration capacitor cathode cathode follower channel Chapter characteristic circuit compensation constant correction cycles per second decibels detector determined diagram downsweep effect equation equipment f-m radar feet filter fixed flight follow-up frequency modulation grid indicated input limiter linear magnetron maximum range megacycles megacycles per second minimum modulation frequency modulation sweep motion nautical miles noise normal operation oscillator pass band phase position potentiometer produce proportional pulse radar quency radar signal radar system radio frequency range and speed range frequency range search range-beat frequency ratio receiver relay resistor rheostats rotation servo shaft shown in Fig slant Sniffer speed sensitivity square wave sweep width target tion transmitter tube unit upsweep variation varying vertical speed vertical-speed wave length zero