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RADIO COMMUNICATION TRANSMISSION SYSTEM FOR VEHICLES

  • US 3,750,020 A
  • Filed: 07/12/1971
  • Issued: 07/31/1973
  • Est. Priority Date: 08/17/1967
  • Status: Expired due to Term
First Claim
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1. A radio communication transmission system for moving vehicles following a track comprising a leaky coaxial cable installed in parallel along a track for a moving vehicle, repeaters interposed in said cable at predetermined locations, transmission means connected to said leaky coaxial cable to transmit thereon a signal from a ground station along said leaky coaxial cable at a low loss from repeater to repeater at a first intermediate frequency, amplification means at each repeater responsive to said first intermediate frequency signal to retransmit said first intermediate frequency signal at a low loss further along said leaky coaxial cable, a frequency converter at each repeater responsive to said first intermediate frequency signal to frequency convert a sample of said first intermediate frequency signal into a first radio frequency signal and to transmit said first radio frequency signal further along said leaky coaxial cable at a uniform leakage for coupling with a receiving antenna on a vehicle on the track, a transmitter with a transmission antenna on a vehicle on the track for the transmission of a second radio frequency signal which will couple with said leaky coaxial cable, said converter being operable to frequency convert said second radio frequency signal to a second intermediate frequency signal and to transmit said second intermediate frequency signal at a low loss on said leaky coaxial cable from repeater to repeater for eventual reception by a ground station.

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