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Automatic antenna coupler fault detector and indicator

  • US 5,257,407 A
  • Filed: 09/20/1990
  • Issued: 10/26/1993
  • Est. Priority Date: 09/20/1990
  • Status: Expired due to Fees
First Claim
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1. In a communication system having a plurality of transmitters for transmitting signals with pre-determined time intervals, also having a plurality of vehicles each having an antenna coupled to a receiver via an active transformation device being biased by a supply current from said receiver, said receiver intended for receiving and decoding said signals with pre-determined time intervals, a processor coupled to said receiver for processing said signals with pre-determined time intervals to determine geographical location of said plurality of vehicles, a transceiver coupled to said processor for transmitting signals containing said geographical location of said plurality of vehicles to a dispatch center, comprising:

  • a circuit for analyzing the coupling status of said receiver to said antenna, comprising;

    measurement means for measuring said bias current;

    comparator means coupled to said measurement means for comparing said bias current to pre-determined levels of current levels for determining the coupling status of said antenna to said receiver; and

    indicator means coupled to said comparator means for indicating said coupling status of said antenna to said receiver to said transceiver.

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