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GMRS radios are typically handheld portable (walkie-talkies) much like Family Radio Service (FRS) radios, and they share a frequency band with FRS near 462 and 467 MHz. Mobile and base station-style radios are available as well, but these are normally commercial UHF radios as often used in the public service and commercial land mobile bands ...
File:GMRS and FRS Frequency Spectrum Chart.svg. ... Correction to GMRS power level 462 MHz interstitial (2 to 5 watts) 22:01, 24 March 2022: 512 × 640 (12 KB)
Dual-mode GMRS/FRS equipment is also approved in Brazil (GMRS only in simplex mode, GMRS frequencies 462.550, 467.550, 462.725, 467.725 are not allowed) [8] and most other South American countries. Portable radios are heavily used in private communications, mainly by security staff in nightclubs and malls, but also in private parking ...
For a time dual-standard FRS and General Mobile Radio Service (GMRS) radios were available, that could be operated without individual licensing on the FRS channels, but which required a license to operate on the GMRS frequencies at a power level above the FRS standard. In May 2017 the regulations were changed so that FRS service included ...
Radio waves are defined by the ITU as: "electromagnetic waves of frequencies arbitrarily lower than 3000 GHz, propagated in space without artificial guide". [5] At the high frequency end the radio spectrum is bounded by the infrared band. The boundary between radio waves and infrared waves is defined at different frequencies in different ...
In addition to radio frequencies used to connect handsets with cellular base stations, other parts of the radio spectrum are used to interconnect base stations and the wired telephone network. Some frequency bands may be vulnerable to interference by existing services in adjacent frequency bands, such as UHF television broadcasting.
It can have a repeater input frequency of 467.675 MHz, and a tone squelch of 141.3 Hz. After FCC deregulation of simplex FRS/GMRS radios, FRS users may transmit up to 2 watts on the GMRS emergency channel 20 (462.675 MHz) with 141.3 Hz CTCSS, or channel 20-22. MURS: 151.940 MHz (only available in the United States)
(a) To develop the use of personal radio services as an additional source of communications for emergencies, disasters, and as an emergency aid to individuals; [1] (b) To establish 24-hour volunteer monitoring of emergency calls, particularly over officially designated emergency frequencies, from personal radio service operators, and report such calls to appropriate emergency authorities; [1]