H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/47
H04B 7/24 (2006.01)
Patent
CA 1071309
45 MR 112 ABSTRACT OF THE DISCLOSURE A plurality of transmitters, such as radio transmitters, frequently share a common communication medium or path, such as a single radio frequency channel. In order to prevent two transmitters from simultaneously transmitting over the common medium, each transmitter is provided with control apparatus. This apparatus causes transmission in response to a start action and in the absence of any other transmission on the medium. The apparatus also produces a repeating signal at predetermined intervals in response to the start action, so that if there is a transmission on the medium, the repeating signal continues until such time as there is an absence of any transmission on the medium. The repeating signal then causes a transmission, and thereafter the repeating signal is stopped. The interval between repeating signals may be the same for each transmitter, but simultaneous transmission by two transmitters will not or is very unlikely to occur because start times are likely to be different.
273070
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