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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]
The technical name for this type of antenna is a normal-mode helix. [7] Rubber ducky antennas are typically 4% to 15% of a wavelength long; [7] that is, 16% to 60% of the length of a standard quarter-wave whip. Protective rubber removed from the antenna on a UHF CB transceiver. The entire length is used for base loading.
Shown with Astatic brand D-104 desk mic Cobra 18 WX ST II mobile CB radio with microphone Cobra 50 WX ST Handheld CB Radio 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 ...
A radio repeater is a combination of a radio receiver and a radio transmitter that receives a signal and retransmits it, so that two-way radio signals can cover longer distances. A repeater sited at a high elevation can allow two mobile stations, otherwise out of line-of-sight propagation range of each other, to communicate. [ 1 ]
[2] [3] After December 2017, the FCC no longer accepts applications to certify hand-held FRS units providing for transmission in any other radio band. FRS radios must use only permanently attached antennas; [2] there are also table-top FRS "base station" radios that have whip antennas. This limitation intentionally restricts the range of ...
For example, the common quarter-wave whip antennas used on FM radios in the USA are approximately 75 cm (2.5 feet) long, which is roughly one-quarter the length of radio waves in the FM radio band, which are 2.78 to 3.41 m (9 to 11 feet) long.