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In many areas of the US, other channels have been used in the past for similar purposes including 10, 17, and 21. [9] Channel 13 has been used in some areas for marine use [8] and for recreational vehicles. [9] Channel 9 is reserved by regulation [3] for emergency use and to provide traveler assistance. In decades past, the channel was ...
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 ...
Besides broadcast messages, Coast Guard stations handle direct traffic between aircraft, cutters, boats, and shore stations on VHF, MF, and HF frequencies, including the HF Data Link encrypted e-mail system and Digital Selective Calling (DSC), which uses radio telephone to send digitally encrypted signals to either one receiver or a group or ...
A vintage (76-89) marine VHF radiotelephone. Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters ), and in certain circumstances ship-to-aircraft. It uses FM channels in the very high frequency ...
Shortwave (HF radio) is used by transoceanic aircraft for communications with air-traffic control centers out of VHF radio range. Most countries with HF citizens'-band allocations use 40 or 80 channels between approximately 26.5 MHz and 27.9 MHz, in 10 kHz steps. Due to antenna-length requirements and the band's long-distance propagation ...
Channel 16 VHF. Channel 16 VHF (156.8 MHz) is a marine VHF radio frequency designated as an international distress frequency. [ 1] Primarily intended for distress, urgency and safety priority calls, the frequency may also carry routine calls used to establish communication before switching to another working channel.
Australia allows use of the standard 26.965–27.405 MHz AM/SSB 40 channel CB band for land mobile (and marine) communications plus 10 marine-only AM channels in the 27.68–27.98 MHz band. Many coast guard stations monitor 27 Meg channel 88 (27.880 MHz) in addition to VHF channel 16 (156.800 MHz) for distress, safety information and calling.
Citizens Broadband Radio Service (CBRS) is a 150 MHz wide broadcast band of the 3.5 GHz band (3550 MHz to 3700 MHz) in the United States. [1] In 2017, the US Federal Communications Commission (FCC) completed a process which began in 2012 to establish rules for commercial use of this band, while reserving parts of the band for the US Federal Government to limit interference with US Navy radar ...
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