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Method for preventing an unauthorized device from operating in a 800 MHz trunked radio communications system

  • US 7,546,085 B1
  • Filed: 08/30/2005
  • Issued: 06/09/2009
  • Est. Priority Date: 08/30/2005
  • Status: Expired due to Fees
First Claim
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1. In a trunked radio communications system operating in the 800 MHz spectrum wherein the trunked radio communications system comprises at least one site, at least one control channel, at least one voice channel, and a plurality of receiving devices, a method for preventing an unauthorized device from operating in the trunked radio communications system, the method comprising the steps of:

  • at a receiving device in the trunked radio communications system;

    determining a transmit frequency, wherein the transmit frequency is calculated by subtracting a voice channel number from 759, multiplying by a channel spacing and adding a base frequency to yield the transmit frequency,wherein the voice channel number is communicated in an outbound signaling message defined by Motorola'"'"'s 3600-baud radio trunking protocol.

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