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Apparatus and method for radio channel selection

  • US 4,309,773 A
  • Filed: 04/18/1980
  • Issued: 01/05/1982
  • Est. Priority Date: 04/18/1980
  • Status: Expired due to Term
First Claim
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1. An improved method for selecting an optimum radio carrier frequency channel, of the type wherein a test signal is transmitted from a first radio for a period of time on each of a set of carrier frequency channels taken sequentially at one rate and a second radio is tuned to each in the set of carrier frequency channels taken sequentially at a higher rate to search for the test signal, the improvement comprising the steps of:

  • at the end of test signal transmission on a set of carrier frequency channels, switching the first radio to a receiving mode;

    tuning the first radio at the higher rate to each carrier frequency channel in the set while in the receiving mode to search for an answer signal from the second radio;

    at the second radio, evaluating with the aid of the test signal the signal-to-noise ratio at each carrier frequency channel on which the test signal is received;

    andat the second radio, after a second separate reception of the test signal on a carrier frequency, tuning the second radio to the carrier frequency channel on which the highest signal-to-noise ratio was detected for transmitting an answer signal thereon;

    whereby all available carrier frequency channels are asynchronously evaluated and the channel having the highest transmission quality is selected.

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