Ultra-high frequency communication installation
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United States of America Patent
Stats
-
Jul 20, 1993
Grant Date -
N/A
app pub date -
Mar 6, 1991
filing date -
Mar 9, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A communication installation for use in a site having underground galleries, for information exchanges, comprises a repeater connected to a wired distribution network. The repeater is arranged for receiving messages which arrive over the wired network at a first frequency and for retransmitting the messages over the network at a second frequency different from the first frequency. The network comprises non-radiating cable sections, radiating cable sections capable to radiate at the second frequency and to collect radiation energy at the first frequency from a portable emitter-receiver set placed nearby. The network further comprises terminal antennae for emitting at the second frequency and collecting energy at the first frequency.
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