. . . . . . . . "Le syst\u00E8me radio\u00E9lectrique du service mobile terrestre est constitu\u00E9 des stations radio\u00E9lectriques du service mobiles terrestre destin\u00E9es \u00E0 fonctionner durant le d\u00E9placement (ou pendant des haltes dans des points non d\u00E9termin\u00E9s) \u00E0 l'int\u00E9rieur des limites g\u00E9ographiques d'une r\u00E9gion, d'un pays ou d'un continent. Inclus et d\u00E9nomm\u00E9 en France dans les r\u00E9seaux radio\u00E9lectriques ind\u00E9pendants[\u00E9vasif]."@fr . . . . . . . . "1085066942"^^ . . "A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld walkie-talkies). Public land mobile radio systems are made for use exclusively by public safety organizations such as police, fire, and ambulance services, and other governmental organizations, and use special frequencies reserved for these services. Private land mobile radio systems are designed for private commercial use, by firms such as taxis or delivery services. Most systems are half-duplex, with multiple radios sharing a single radio channel, so only one radio can transmit at a time. The transceiver is normally in r"@en . "3080842"^^ . . . . . . . . . . . "A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld walkie-talkies). Public land mobile radio systems are made for use exclusively by public safety organizations such as police, fire, and ambulance services, and other governmental organizations, and use special frequencies reserved for these services. Private land mobile radio systems are designed for private commercial use, by firms such as taxis or delivery services. Most systems are half-duplex, with multiple radios sharing a single radio channel, so only one radio can transmit at a time. The transceiver is normally in receiving mode so the user can hear other radios on the channel; to talk, the user presses a push to talk button that turns on the transmitter mode of the transceiver. 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 transcievers. 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. Repeaters installed on tall buildings, hills or mountain peaks can be used to increase the coverage area. Older systems use AM or FM modulation, while some recent systems use digital modulation allowing them to transmit data as well as sound."@en . "Syst\u00E8me radio\u00E9lectrique du service mobile terrestre"@fr . . . . . . . . . . . . . . . . "10657"^^ . . . "Le syst\u00E8me radio\u00E9lectrique du service mobile terrestre est constitu\u00E9 des stations radio\u00E9lectriques du service mobiles terrestre destin\u00E9es \u00E0 fonctionner durant le d\u00E9placement (ou pendant des haltes dans des points non d\u00E9termin\u00E9s) \u00E0 l'int\u00E9rieur des limites g\u00E9ographiques d'une r\u00E9gion, d'un pays ou d'un continent. Inclus et d\u00E9nomm\u00E9 en France dans les r\u00E9seaux radio\u00E9lectriques ind\u00E9pendants[\u00E9vasif]."@fr . . . . . . "Land mobile radio system"@en . . . .