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Modular communications system including a portable unit range extender and selective-call system

  • US 5,163,158 A
  • Filed: 09/12/1991
  • Issued: 11/10/1992
  • Est. Priority Date: 01/12/1989
  • Status: Expired due to Term
First Claim
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1. A system for extending the range of portable transceivers adapted to operate in a first multi-channel unrestricted band comprising:

  • a multi-channel RF base station transceiver operating in an unattended mode in said band on a simplex basis and having and antenna coupled thereto for relatively long distance communication;

    a base control unit coupled to said base station transceiver for transmitting and receiving signals to and from said base station for the control thereof, said base control unit including a duplex transmission capability including means for transmitting RF signals to said portable transceiver on a first split channel within a second multi-channel unrestricted band, and means for receiving RF signals from said portable transceiver on a second split channel within said second unrestricted band;

    a power supply at said base station transceiver; and

    ,a portable transceiver operating in said second multi-channel unrestricted band, said portable transceiver having means for receiving and demodulating signals from said base control unit and for reproducing and demodulated signals; and

    , means for transmitting to said base control unit on one of said split channels signals representing voice communications, a signal for actuating said base station transceiver upon the activation of said portable unit, an authorization code signal such that said base station transceiver will only be under the control of said portable transceiver, a channel select code signal for setting the channel of said base station transceiver, and an end of transmission code signal for placing said base station transceiver in its receive mode, said base control unit receiving means having means responsive to said signals from said portable transceiver for controlling said base station transceiver in the manner dictated thereby.

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