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Mobile radio extension unit with punch through operation

  • US 3,955,140 A
  • Filed: 05/20/1975
  • Issued: 05/04/1976
  • Est. Priority Date: 05/20/1975
  • Status: Expired due to Term
First Claim
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1. In a bidirectional communication system having a first carrier signal source, first transceiver means providing a communication link with said first signal source, second transceiver means for receiving and transmitting signals over a limited range, and an extension unit for establishing a communication link between said first signal source and said second transceiver via said first transceiver, the improvement wherein said extension unit includes punch through means responsive to receipt of a signal from said second transceiver means when said extension unit has established a communication link from said first signal source to said second transceiver via said first transceiver for enabling priority signal transmission from said second transceiver to said first signal source via said first transceiver, said extension unit including a transmitter and a receiver adapted to communicate with said second transceiver, and said punch through means includes sampling means for periodically interrupting transmission to said second transceiver to enable detection of said signal from said second transceiver and means responsive to detection of said last named signal for maintaining said extension unit receiver in the active state and for maintaining said first transceiver means in the transmit mode.

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