Definitions of RF Radar Terms
"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"

Water Line: A reference line used for vertical measurements. When used with an aircraft it is usually the ground with the landing gear extended normally. One of several aircraft location designations.

Waveguide: A transmission line consisting of a hollow conducting tube of arbitrary geometry (usually rectangular, but may be circular) within which electromagnetic waves may propagate. A hollow metal tube used as a transmission line to guide energy from one point to another. MIL-HDBK-660A - Fabrication of Rigid Waveguide Assemblies. [WaveGuide Manufacturers]

Wavelength: The distance traveled by a wave in one period (the period is the time required to complete one cycle). Wavelength = c/f. In the atmosphere, electromagnetic waves travel at c, the speed of light (300 million meters per second or 30 cm/nsec). At 5 GHz, one wavelength = 6 cm. At 10 GHz, one wavelength = 3 cm. The distance between points of corresponding phase of two consecutive cycles of a wave.

Wavemeter: An instrument for measuring the frequency of a radio wave. The wavemeter is a mechanically tunable resonant circuit. It must be part of a reflection of transmission measurement system to measure the maximum response of a signal. Below 20 GHz, the wavemeter has been replaced by the frequency counter with much greater accuracy and ease of use. For reference; Manufacturers of Test Equipment.

Whip antenna: A vertical monopole, another type of antenna. See graphic below right. [Antenna Manufacturers], [Antenna Dictionary].

White Noise: or random noise. White noise has random amplitude, but is equally distributed across the entire band of frequencies of interest.

Wire: Conductors in one of many different sizes with different kinds of insulation. The American Wire Gauge defines the different sizes of copper wire. [Wire and Cable Manufacturers]. Wire conductors may be insulated or uninsulated, or solid or stranded wire. Any number of wire strands could be used to produce the finished conductor.

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