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Statements

Subject Item
dbr:Land_mobile_radio_system
rdf:type
yago:Object100002684 yago:Whole100003553 yago:PhysicalEntity100001930 yago:WikicatMilitaryRadioSystems yago:System104377057 yago:Instrumentality103575240 yago:Artifact100021939
rdfs:label
Système radioélectrique du service mobile terrestre Land mobile radio system
rdfs:comment
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 Le système radioélectrique du service mobile terrestre est constitué des stations radioélectriques du service mobiles terrestre destinées à fonctionner durant le déplacement (ou pendant des haltes dans des points non déterminés) à l'intérieur des limites géographiques d'une région, d'un pays ou d'un continent. Inclus et dénommé en France dans les réseaux radioélectriques indépendants[évasif].
dct:subject
dbc:Military_radio_systems
dbo:wikiPageID
3080842
dbo:wikiPageRevisionID
1085066942
dbo:wikiPageWikiLink
dbr:Push_to_talk dbr:Amateur_radio dbr:Two-way_radio dbr:Wavelength dbr:U.S._Federal_Communications_Commission dbr:Ultrahigh_frequency dbc:Military_radio_systems dbr:Government_Accountability_Office dbr:Demodulation dbr:Public_safety dbr:Astro_(Motorola) dbr:Continuous_Tone-Coded_Squelch_System dbr:U.S._military dbr:Ottawa dbr:Digital_signal dbr:Base_station dbr:Land_mobile_service dbr:Very_high_frequency dbr:Radio_receiver dbr:Transceiver dbr:Frequency_modulation dbr:Transmitter dbr:Walkie-talkie dbr:UHF dbr:VHF dbr:Half-duplex dbr:Repeater dbr:Taxi dbr:Amplitude_modulation dbr:Audio_signal
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yago-res:Land_mobile_radio_system n9:4q2ZW freebase:m.08q1wn wikidata:Q6484101 dbpedia-fr:Système_radioélectrique_du_service_mobile_terrestre
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dbo:abstract
Le système radioélectrique du service mobile terrestre est constitué des stations radioélectriques du service mobiles terrestre destinées à fonctionner durant le déplacement (ou pendant des haltes dans des points non déterminés) à l'intérieur des limites géographiques d'une région, d'un pays ou d'un continent. Inclus et dénommé en France dans les réseaux radioélectriques indépendants[évasif]. 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.
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wikipedia-en:Land_mobile_radio_system