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RADIO TRANSMITTER RECEIVER INCLUDING LEVEL AND ANTENNA DIRECTION CONTROL CIRCUITRY

  • US 3,781,890 A
  • Filed: 11/20/1970
  • Issued: 12/25/1973
  • Est. Priority Date: 11/20/1969
  • Status: Expired due to Term
First Claim
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1. A radio transmitter-receiver for operation in one of k individual vocal frequency bands in an overall frequency range made up of k + 1 frequency bands, comprising a transmitter section for transmitting both communication and control signals, a receiver section for receiving signals from another transmitter-receiver, antenna means selectively connectable to said transmitter section and said receiver section, and call coder means for generating a pulsed code of n digits for modulation in one of said k individual vocal frequency bands, whereby a total of 2nk pulsed codes are available as the output of said call coder means, said call coder means being connected to said transmitter section for supplying the pulsed code thereto for transmission by said transmitter section.

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