A simplex communication system is one where all signals flow in one direction.
These systems are often employed in broadcast networks, where the receivers do not need to send any data back to the transmitter/broadcaster.
Examples Citizens band radio (CB) is, in the United States, a system of short distance radio communication between individuals on a selection of 40 channels within the single 27 MHz (11 meter) band. ...
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NTIA TR-97-343, Appendix F (714 words)
Simplex channel 22A was used as the desired signal channel for testing the interoperability of a 12.5 kHz transmitter with the 25 kHz receivers.
Channel 22A was also used to test the interoperability of a 25 kHz transmitter with a 12.5 kHz receiver on a simplex channel .
Channel 85 was used to test the interoperability of a 25 kHz transmitter and 12.5 kHz receiver on a duplex channel .
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