The method for transmitting and receiving still images. These images can be maps, photographs, and handwritten or printed text [17].
FACTOR
Any of the elements, quantities, or symbols that, when multiplied together, form a product [13].
FADING
Variations in signal strength by atmospheric conditions [101 [17].
FARAD
The basic unit of capacitance. A capacitor has a capacitance of 1 farad when a voltage potential of 1 volt across it produces a charge of 1 coulomb [2].
FARADAY ROTATION
The rotation of the plane of polarization of electromagnetic energy when it passes a substance influenced by a magnetic field that has a component in the direction of propagation [11].
FAST-TIME-CONSTANT CIRCUIT
Differentiator circuit in the first video amplifier that allows only the leading edges of target returns, no matter how small or large, to be used [18].
FEEDBACK
The return of a portion of the output of a circuit to its input [8] [18].
FEEDER
A transmission line that carries energy to the antenna [10].
FEEDHORN
A horn radiator used to feed a reflector [18].
FEP
A synthetic type of insulation (fluorinated ethylene propylene) [4].