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Dual mode satellite cellular telephone systems

  • US 20030060195A1
  • Filed: 10/21/2002
  • Published: 03/27/2003
  • Est. Priority Date: 09/14/1994
  • Status: Active Grant
First Claim
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1. In a dual-mode satellite/cellular telephone system including a cellular telephone, a satellite-cellular communications adapter, separate from said cellular-telephone, said communications adapter comprising:

  • a converter for converting satellite signals received from an orbiting satellite into information signals for use by said cellular telephone and for converting-information signals received from said cellular telephone into satellite signals for transmission to the orbiting satellite; and

    an interface for connecting said communications adapter to said cellular telephone and for communicating information signals between said adapter and said cellular telephone, wherein information signals communicated via said interface said cellular telephone to said adapter include balanced in-phase and quadrature drive signals, and wherein information signals communicated from said adapter to said cellular telephone include an intermediate frequency signal.

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