Patent ID: 7085573

Claim:
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 comprising the steps of: at a receiving device in the trunked radio communications system: requesting a voice channel for a communication; receiving an outbound signaling message on a control channel comprising a voice channel number for the receiving device to utilize for the communication on a voice channel, wherein the outbound signaling message is defined by Motorola™ 3600-baud radio trunking protocol; tuning to about a transmit frequency, wherein the transmit frequency is determined by multiplying the voice channel number by a channel spacing and adding a base frequency to yield the transmit frequency, if the voice channel number is between 0 and 119; modulating the communication to about the transmit frequency; and transmitting the modulated communication with a transmit deviation that relates to a maximum of 4 kHz.