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Frequency assignments between US and Canadian users are closely coordinated since much of the Canadian population is within VHF radio range of the US border. Certain discrete frequencies are reserved for radio astronomy. The general services in the VHF band are: 30–49.6 MHz: Licensed 2-way land mobile communication, with various sub-bands. [a]
One of the most powerful of these stations is WBCT in Grand Rapids, Michigan, which operates at 320,000 watts and 238 meters (781 ft) HAAT. Zone III (the zone with the flattest terrain) consists of all of Florida and the areas of Alabama , Georgia , Louisiana , Mississippi , and Texas within approximately 241.4 kilometers (150.0 mi) of the Gulf ...
The legally protected range of a station extends beyond this range, out to the point where signal strength is expected to be 1mV/m for most stations in North America, though for class B1 stations it is 0.7mV/m, and as low as 0.5mV/m for full class B stations (the maximum allowed in densely populated areas of both Canada and the U.S.).
R/C transmitters may use up to 4 watts on the first five channels and 25 watts on the last, 27.255 MHz. Some in-house paging systems, and car alarms with a paging feature, also use these frequencies, especially 27.255 MHz, where the higher power is permitted. The 27 MHz RCRS channels are not officially numbered by the FCC.
There was limited overlap between armor and artillery radios, and between artillery and infantry radios, but none between armor and infantry. The transceivers in the new AN/VRC-12 series were half the size and weight of the GRC-3x series, output twice the power, yet covered all frequencies in the larger 30 to 76 MHz FM band and provided 920 ...
The allocation limits amateur stations to 15 watts effective isotropic radiated power (EIRP); however some locations will be permit up to 25 W EIRP. 40 metres – 7.000–7.300 MHz – 42.83–41.51 m actual; Considered the most reliable all-season long distance band. Popular for DX at night, 40 metres is also reliable for medium distance ...
Land mobile radio systems use channels in the VHF or UHF bands, since the antennas used at these short wavelengths are small enough to mount on vehicles or handheld transceivers. Transmitter power is usually limited to a few watts, to provide a reliable working range on the order of 3 to 20 miles (4.8 to 32 km) depending on terrain.
A standard handheld marine VHF, mandatory on larger seagoing vessels under the GMDSS rules A VHF set and a VHF channel 70 DSC set, the DSC on top 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 ...