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After the 1973 oil crisis, the U.S. government imposed a nationwide 55 mph speed limit, and fuel shortages and rationing were widespread.Drivers (especially commercial truckers) used CB radios to locate service stations with better supplies of fuel, to notify other drivers of speed traps, and to organize blockades and convoys in a 1974 strike protesting the new speed limit and other trucking ...
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]
'T' antenna of amateur radio station, 80 ft high, ... Gain of 8–10 dBi. Used as base station antennas for land mobile radio systems such as police, fire, ...
Waveforms: AM, AME, USB, LSB, CW, FM [10] Antenna connector: BNC female with threaded collar, 50 Ω characteristic impedance, unbalanced [10] Antenna Tuning Capability: OE-505 10-foot (3 m) whip, RF-1941 dipole, random wires, long wires [10] Data Interface: USB and Ethernet with adapter [10] GPS: Internal antenna, with external antenna connector.
The KVLY-TV mast is the tallest structure in the United States, at 2,063 ft (629 m) tall Galesville, Wisconsin WKBT-DT tower. This is a list of the tallest structures in the US that are at least 350 meters, ordered by height. Most are guyed masts used for FM- and TV-broadcasting:
Counterpoises are typically used in antenna systems for radio transmitters where a good earth ground connection cannot be constructed.. Monopole antennas used at low frequencies, below 3 MHz, such as the mast radiator antennas used for AM broadcasting, require the radio transmitter to be electrically connected to the Earth under the antenna; this is called a ground (or earth).
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