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Multiple address radio system having automatic radio calibration for reducing frequency offset between radio frequency carriers

  • US 5,898,903 A
  • Filed: 03/14/1996
  • Issued: 04/27/1999
  • Est. Priority Date: 03/14/1996
  • Status: Expired due to Fees
First Claim
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1. A multiple address radio network comprising:

  • (a) central radio station for transmitting a first radio frequency carrier;

    (b) a remote radio located at a remote radio site for receiving said first radio frequency carrier from said central radio station and for transmitting a second radio frequency carrier; and

    (c) a frequency calibration circuit connected to said remote radio for sensing frequency offset between said first radio frequency carrier and said second radio frequency carrier at said remote radio site and for adjusting said remote radio at said remote radio site to reduce frequency offset between said first radio frequency carrier and said second radio frequency carrier, said frequency calibration circuit comprising a temperature compensated crystal oscillator adjustable for reducing frequency offset between said first radio frequency carrier and said second radio frequency carrier, said frequency calibration circuit further comprising a microprocessor for detecting and measuring the frequency offset between said first radio frequency carrier and said second radio frequency carrier, and a potentiometer responsive to the output of said microprocessor for adjusting said temperature compensated crystal oscillator to reduce frequency offset between said first radio frequency carrier and said second radio frequency carrier.

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