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- Tunnel_transmitter abstract "A tunnel transmitter allows wireless reception in tunnels. It consists of a receiving antenna which receives the signal to be radiated in the tunnel, and a transmitting antenna installed in the tunnel, which is either a Yagi antenna or a line antenna. In principle, a tunnel transmitter can work purely passively, in which case the received signal is passed over a cable to the antenna in the tunnel. Active systems, however, are more often used. In some cases the radio frequency inside the tunnel is different from the one used by the broadcaster. More often the program inside is transmitted on the same frequency as outside, in which case the information signal should be demodulated or converted to an intermediate frequency in the outside receiver, and then modulated/shifted back in the transmitter. Otherwise feedback may occur.Tunnel transmitters are used in Germany only for audio transmitters working in FM-range and for further radio services, such as mobile phone services which also work in this frequency range. Elsewhere, there are also tunnel transmitters for audio broadcast transmitters, which work in the long and medium wave bands. An example of this is in the Dartford Crossing tunnel near London, where the programme \"Virgin 1215\" in the medium-wave band and the BBC's Radio 4 on 198 kHz long wave are rebroadcast in the tunnel. Emergency information could also be relayed using this system, interrupting programming to relay warnings.".
- Tunnel_transmitter wikiPageExternalLink Hazardous%20Vehicles%20Guide_Layout%201.pdf.
- Tunnel_transmitter wikiPageID "12828176".
- Tunnel_transmitter wikiPageLength "1944".
- Tunnel_transmitter wikiPageOutDegree "15".
- Tunnel_transmitter wikiPageRevisionID "695815010".
- Tunnel_transmitter wikiPageWikiLink Absolute_Radio.
- Tunnel_transmitter wikiPageWikiLink BBC.
- Tunnel_transmitter wikiPageWikiLink BBC_Radio_4.
- Tunnel_transmitter wikiPageWikiLink Broadcasting.
- Tunnel_transmitter wikiPageWikiLink Category:Antennas.
- Tunnel_transmitter wikiPageWikiLink Category:Broadcast_transmitters.
- Tunnel_transmitter wikiPageWikiLink Dartford_Crossing.
- Tunnel_transmitter wikiPageWikiLink Feedback.
- Tunnel_transmitter wikiPageWikiLink Intermediate_frequency.
- Tunnel_transmitter wikiPageWikiLink Leaky_feeder.
- Tunnel_transmitter wikiPageWikiLink Longwave.
- Tunnel_transmitter wikiPageWikiLink Medium_wave.
- Tunnel_transmitter wikiPageWikiLink Through-the-earth_mine_communications.
- Tunnel_transmitter wikiPageWikiLink Tunnel.
- Tunnel_transmitter wikiPageWikiLink Yagi-Uda_antenna.
- Tunnel_transmitter wikiPageWikiLinkText "Tunnel transmitter".
- Tunnel_transmitter wikiPageWikiLinkText "tunnel transmitter".
- Tunnel_transmitter wikiPageUsesTemplate Template:Cn.
- Tunnel_transmitter wikiPageUsesTemplate Template:Reflist.
- Tunnel_transmitter wikiPageUsesTemplate Template:Unreferenced.
- Tunnel_transmitter subject Category:Antennas.
- Tunnel_transmitter subject Category:Broadcast_transmitters.
- Tunnel_transmitter type Component.
- Tunnel_transmitter comment "A tunnel transmitter allows wireless reception in tunnels. It consists of a receiving antenna which receives the signal to be radiated in the tunnel, and a transmitting antenna installed in the tunnel, which is either a Yagi antenna or a line antenna. In principle, a tunnel transmitter can work purely passively, in which case the received signal is passed over a cable to the antenna in the tunnel. Active systems, however, are more often used.".
- Tunnel_transmitter label "Tunnel transmitter".
- Tunnel_transmitter sameAs Q2460115.
- Tunnel_transmitter sameAs Tunnelfunkanlage.
- Tunnel_transmitter sameAs m.02x6m2d.
- Tunnel_transmitter sameAs Q2460115.
- Tunnel_transmitter wasDerivedFrom Tunnel_transmitter?oldid=695815010.
- Tunnel_transmitter isPrimaryTopicOf Tunnel_transmitter.