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The antenna may not be more than 20 feet (6.1 m) above the highest point of the structure it is mounted to, or the highest point of the antenna must not be more than 60 feet (18.3 m) above the ground (47 CFR 95.408(c)) if installed in a fixed location. [4] CB radios must include AM or SSB modulation and may include frequency modulation. [5]
Citizens band radio (CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band.
"Wholesale Radio Service" was established in the early 1920s by Abraham Pletman in New York City. Radios sold by the company were trademarked “Lafayette” in July 1931. Following a Federal Trade Commission action in 1935, Wholesale Radio Service became "Radio Wire Television, Inc.". A 1939 company catalog bore the names Radio Wire Television ...
Swan merged with Cubic Corporation in 1967, and Johnson managed Swan as its subsidiary until 1973. Johnson founded Atlas Radio in 1974. Atlas produced smaller solid state radios for mobile communications from vehicles of all types. [3] Many Swan radios remain in service today, restored and operated by vintage amateur radio enthusiasts. [2]
Citizens band radio (often shortened to CB radio) is a system of short-distance radio communications between individuals on a selection of 40 channels within the 27-MHz (11 m) band. In the United Kingdom, CB radio was first legally introduced in 1981, but had been used illegally for some years prior to that.
An example of a low-gain antenna is the whip antenna found on portable radios and cordless phones. Antenna gain should not be confused with amplifier gain, a separate parameter measuring the increase in signal power due to an amplifying device placed at the front-end of the system, such as a low-noise amplifier.