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Gain adjustment method in two-way communication systems

  • US 5,778,309 A
  • Filed: 10/07/1996
  • Issued: 07/07/1998
  • Est. Priority Date: 07/06/1992
  • Status: Expired due to Term
First Claim
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1. A method of interrogating a portable RF transceiver, comprising the steps of:

  • providing an interrogator RF transceiver;

    establishing a minimum power level;

    setting a current power level value equal to said minimum power level;

    the interrogator transceiver transmitting an interrogation RF signal at said current power level;

    after transmitting the interrogation signal, the interrogator transceiver waiting a period of time to receive a response RF signal;

    the interrogator transceiver determining whether said period of time has elapsed without the interrogator transceiver receiving said response signal and, only if so, thenincreasing said current power level value, andrepeating the steps of the interrogator transceiver transmitting, waiting, and determining;

    providing a portable RF transceiver which is substantially smaller and lighter than the interrogator transceiver;

    the portable RF transceiver waiting to receive the interrogation RF signal; and

    in response to receiving the interrogation signal, the portable transceiver transmitting the response RF signal.

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