"A", "B", "C", "D", "E", "F", "G"/"H", "I"/"J"/"K"/"L", "M"/"N"/"O",
"P"/"Q", "R", "S", "T"/"U"/"V"/"W"/"X"/"Y"/"Z"

Fading: A periodic decrease in received signal strength. Variations in signal strength by atmospheric conditions.

Feeder: A transmission line that carries energy to the antenna.

Feedpoint impedance: Impedance that is measured at the input terminals of an electrical device such as an antenna.

Fields: Regions in which each point has a value of a physical quantity (voltage, magnetic force, velocity, mass, etc.).

Flexible Coaxial Line: A coaxial line made with a flexible inner conductor insulated from the outer conductor by a solid, continuous insulating material. [Definition of Coaxial Cable, Coax]

Folded Dipole: An ordinary half-wave antenna (dipole) that has one or more additional conductors connected across the ends parallel to each other.

Four-Element Array: An array with three parasitic elements and one driven element.

Free space: The absence of matter.

Free space loss: The loss of energy of a radio wave because of the spreading of the wavefront as it travels from the transmitter.

Frequency: The rate at which a process repeats itself. In radio communications, frequency is expressed in cycles per second.

Frequency hopping: A method of jumping from frequency to frequency in synchronization with one another in a random order at a rate of up to 100 times per second. Frequency hopping is the preferred method of communication with SINCGARS radios.

Frequency modulation: The process of varying the frequency of a carrier wave, usually with an audio frequency, in order to convey intelligence. Also called FM.

Frequency of optimum transmission: 85 percent of the maximum usable frequency (MUF). A practical frequency selection which allows for MUF variations.

Antenna "G" and "H" Terms

 
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