PULSINGAllowing oscillations to occur for a specific period of time only during selected
QUANTIZED WAVEA wave created by arbitrarily dividing 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.
QUANTIZING NOISEA distortion introduced by quantizing the signal.
RADAR DETECTORA detector which, in its simplest form, only needs to be capable of
producing an output when rf energy (reflected from a target) is present at its input.
RATIO DETECTORA detector that uses a double-tuned transformer to convert the
instantaneous frequency variations of the fm input signal to instantaneous amplitude
RATIO OF TRANSMITTED POWERSThe power ratio (fsk verses AM) that expresses the
overall improvement of fsk transmission when compared to AM under rapid-fading and
REACTANCE TUBEA tube connected in parallel with the tank circuit of an oscillator.
Provides a signal that will either lag or lead the signal produced by the tank.
REACTANCE-TUBE MODULATORAn fm modulator that uses a reactance tube in parallel
with the oscillator tank circuit.
REGENERATIVE DETECTORA detector circuit that produces its own oscillations,
heterodynes them with an incoming signal, and detects them.
REST FREQUENCYThe carrier frequency during the constant-amplitude portions of a phase
REST TIME (rt)The time when there is no pulse or nonpulse.
ROTARY GAPSimilar to a mechanically driven switch. Used to discharge a pulse-forming
SENSITIVITY OF A MICROPHONEEfficiency of a microphone. Describes micro- phone
power delivered to a matched-impedance load as compared to the sound level being
converted. Usually expressed in terms of the electrical power level.
SERIES-DIODE DETECTORThe semiconductor diode in series with the input voltage and
the load impedance. Sometimes called a voltage-diode detector.
SHUNTMeans the same as parallel or to place in parallel with other components.
SHUNT-DIODE DETECTORA diode detector in which the diode is in parallel with the input
voltage and the load impedance. Also known as a current detector because it operates with
smaller input levels.
SIGNAL DISTORTIONAny unwanted change to the signal.
SIGNIFICANT SIDEBANDSThose sidebands with significantly large amplitude.