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System for identifying a responding station for a radio communications system

  • US 4,628,537 A
  • Filed: 10/18/1983
  • Issued: 12/09/1986
  • Est. Priority Date: 10/19/1982
  • Status: Expired due to Fees
First Claim
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1. A communications system having a plurality of speech channels one of which is to be selected to convey an information, adapted to perform a simplex communication, comprising:

  • a searching operation control means for comanding sequential operations of (I) setting the communications system to a receiving state at a speech channel and detecting the presence of a carrier signal and in turn selecting a next speech channel and detecting the presence of a carrier signal if the carrier signal is present at said speech channel, (II) transmitting an audible signal at a selected speech channel at which the carrier signal is not detected, (III) detecting once more the presence of the carrier signal at the selected speech channel, and (IV) memorizing infomation of the selected speech channel as a non-busy speech channel only if the carrier signal is not present at the selected speech channel.

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