Patent ID: 6885854

Claim:
A data transmission system for off-board communications to and from a railroad train comprising: a central processing unit to which information relating to operation of the train is received and formatted for transmission to a receiving site remote from the train; a radio to which a signal for transmission to the receiving site is supplied by the central processing unit, the radio operating within a specified frequency range; at least two antennas to each of which a transmission signal produced by the radio is sent for broadcasting by the antennas to a receiver located at the receiving site; and, a signal splitter by which a transmission signal produced by the radio is divided, the signal splitter supplying transmission signals to each of the antennas for transmission thereby to the receiving site on a selective basis which is a function of signal magnitude and phase weighting whereby the transmission signal is broadcast by the antennas, the central processing unit selecting which of the antennas over which the transmission signal is broadcast at any one time.