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F

FREQUENCY STABILITY

Refers to the ability of an oscillator to accurately maintain its operating
frequency [9].


FREQUENCY SYNTHESIS

A process that uses hetrodyning and frequency selection to produce a signal
[17].


FREQUENCY SYNTHESIZER

(1) A frequency source of high accuracy [17]. (2) A bank of oscillators in which the outputs can be mixed in various combinations to produce a wide range of frequencies [18].


FREQUENCY-DETERMINING NETWORK

A circuit that provides the desired response (maximum or minimum impedance) at a specific frequency [8].


FREQUENCY-DIVISION MULTIPLEXING

Multiplexing that transmits and receives the full 360 degrees of each sine wave [17].


FREQUENCY-RESPONSE CURVE

A curve showing the output of an amplifier (or any other device) in terms of voltage or current plotted against frequency with a fixed-amplitude input signal [8].


FREQUENCY-SHIFT KEYING

Frequency modulation somewhat similar to continuous-wave (cw) keying in AM transmitters. The carrier is shifted between two differing frequencies by opening and closing a key [12].


FRONT-TO-BACK RATIO

The ratio of the energy radiated in the principal direction compared to the
energy radiated in the opposite direction [10].


FULL-WAVE RECTIFIER

A circuit that uses both positive and negative alternations in an alternating
current to produce direct current [6] [7].


FULL-WAVE VOLTAGE DOUBLER

Consists of two half-wave voltage rectifiers and is used to reduce the output ripple amplitude [7].



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