Patent ID: 8811906

Claim:
An apparatus for transmitting data via frequency modulation (FM) of electromagnetic radiation; the apparatus comprising: a. a first FM transmitter configured to transmit a first FM signal on a first FM channel characterized by a first carrier frequency, the first FM signal including the data and optionally an indication of one or more first alternative frequencies (AFs); b. a second FM transmitter configured to transmit a second FM signal on a second FM channel characterized by a second carrier frequency, the second FM signal including the data and optionally an indication of one or more second AFs; c. a first receiver configured to receive incoming electromagnetic radiation associated with at least one of the first FM channel and the second FM channel; d. a second receiver configured to receive incoming electromagnetic radiation at least at one or more frequencies outside of the first FM channel and the second FM channel; and e. a controller operatively connected with the first FM transmitter, the second FM transmitter, the first receiver and the second receiver, the controller configured to determine the first carrier frequency and the second carrier frequency based upon incoming electromagnetic radiation; the controller further configured to separately control activation and deactivation of the first FM transmitter and the second FM transmitter.