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I think this is what is meant here. One definition: "(Cross-talk equipment translates one radio frequency signal to another, allowing radios with different frequencies to communicate in limited situations.)" http://www.fas.org/sgp/crs/homesec/RL32939.pdf ). Would appreciate a second opinion, though.
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Explanation: Langt fra sikker, men du kan i hvert fall bruke koblingen under til å finsjekke :-).
Ved større ulykker kan basestasjonene settes i gjennomsnakk, også kalt aksjonssamband.
Radio rebroadcast system
do a google search on rebroadcast system for example in one way communication:
The radio rebroadcast system allows CityLink to override the signal on your car radio with safety messages or specific emergency instructions. When driving in a CityLink tunnel it is recommended to always have your car radio switched on.
The link below explaing a voice and data rebroadcast system in two way communication: