Method of setting radio transmitters for synchronous radio transmission

Claim 1

In a transmission system having a central radio station and a plurality of other radio stations connected by lines to the central station, wherein each of the stations includes a transmitter for transmitting to receiving devices, the method of setting, before transmission by a plurality of the radio stations of messages generated by the central station, for synchronizing the operation of a first of said other stations to a second of said other stations at least comprising the steps of: the central station sending on lines to said first and second other stations an order message to set for simultaneous transmission, each of said first and second other stations noting the time of receipt of said order message, said second other station radio transmitting said order message a first given period of time after the receipt thereof, said first other station noting and storing the time of arrival of said order message over the air from said second other station, said first station establishing the delay time of transmission over the air of a subsequent message received on a line, said established delay time being the difference between the time of reception via the line of said order message from the central station and the time of reception of said order message over the air from the second other station less the propogation time, stored in the first other station, for a message to be transmitted over the air from said second other station to said first other station.