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Radio Communication device capable of setting a frequency channel with a small frequency step

  • US 6,009,313 A
  • Filed: 07/02/1997
  • Issued: 12/28/1999
  • Est. Priority Date: 07/02/1996
  • Status: Expired due to Fees
First Claim
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1. A radio communication device comprising:

  • a carrier generating circuit for generating a transmit carrier signal, said carrier generating circuit comprising a first frequency synthesizer capable of varying an intermediate frequency of said transmit carrier signal using a first step frequency;

    a radio-frequency local signal generating circuit for generating a radio-frequency local signal, said radio-frequency local signal generating circuit comprising a second frequency synthesizer capable of varying a radio frequency of said radio-frequency local signal using a second step frequency different from said first step frequency;

    a transmitting section connected to said carrier generating and said radio-frequency local signal generating circuits for generating a transmit radio-frequency signal in response to said transmit carrier signal and said radio-frequency local signal with a frequency up-conversion to transmit said transmit radio-frequency signal; and

    a control circuit connected to said first and said second frequency synthesizers for cooperatively controlling said first and said second frequency synthesizers so as to allow a transmission channel to be set with a frequency step equal to a difference between said first and said second step frequencies.

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