1-58 PULSE-REPETITION FREQUENCY (PRF)—The rate, in pulses per second, at which the pulses occur [9] [12] [18]. PULSE-REPETITION RATE (PRR)—Same as PULSE-REPETITION FREQUENCY (PRF) [9] [12] [18]. PULSE-REPETITION TIME (PRT)—Interval between the start of one pulse and the start of the next pulse; reciprocal of pulse-repetition frequency [18]. PULSE-TIME MODULATION (PTM)—Pulse modulation that varies one of the time characteristics of a pulse train (pwm, pdm, ppm, or pfm) [12]. PULSE WIDTH—Duration of time between the leading and trailing edges of a pulse [12] [18]. PULSE-WIDTH MODULATION (PWM)—Pulse modulation in which the duration of the pulses is varied by the modulating voltage [12]. PULSING—Allowing oscillations to occur for a specific period of time only during selected intervals [12]. PUMP—Electrical source of the energy required to vary the capacitance of a parametric amplifier [11]. PUSH-PULL AMPLIFIER—An amplifier that uses two transistors (or electron tubes) whose output signals are in phase opposition [8]. Q—(1) Figure of merit of efficiency of a circuit or coil. (2) Ratio of inductive reactance to resistance in servos. (3) Relationship between stored energy (capacitance) and rate of dissipation in certain types of electric elements, structures, or materials [2] [9]. QUALITY (OF SOUND)—The factor that distinguishes tones of pitch and loudness [10]. QUANTIZED WAVE—A wave created by the arbitrary division of the entire range of amplitude (or frequency, or phase) values of an analog wave into a series of standard values. Each sample takes the standard value nearest its actual value when modulated [12]. QUANTIZING NOISE—A distortion introduced by quantizing the signal [12]. QUANTUM-MECHANICAL TUNNELING—The action of an electron crossing a PN junction because of tunnel effect [7]. QUARTER-WAVE ANTENNA—Same as the MARCONI ANTENNA [10]. QUIESCENCE—(1) The state of an amplifier with no signal applied. (2) The operating conditions that exist in a circuit when no input signal is applied to the circuit [6] [71 [13]. QUIESCENT STATE—The period during which a transistor, tube, or other circuit element is not performing an active function in the circuit [9] [13]. RADAR—An acronym for RAdio Detecting And Ranging [18]. RADAR ALTIMETER—Airborne radar that measures the distance of the aircraft above the ground [18]. RADAR BEAM—The space in front of a radar antenna where a target can be effectively detected or tracked. Defined by areas that contain half or more of the maximum power transmitted [18].
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