A receiving device in a trunked radio communications system determines a transmit frequency, wherein the transmit frequency is calculated by subtracting 440 from a voice channel number, multiplying by a channel spacing and adding a base frequency to yield the transmit frequency, if the voice channel...http://www.google.fr/patents/US7171213?utm_source=gb-gplus-shareBrevet US7171213 - Method for operating in a 800 MHz trunked radio communications system for channels 440 to 559
Method for operating in a 800 MHz trunked radio communications system for ...
