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Full duplex is when you can talk and listen at the same time like on a telephone handset. Half duplex is simple where you can use a pushbutton to talk then your listening is cutoff or release the pushbutton to listen but not transmit.
Automatic half duplex (voice switching) is used on cheap speakerphones where the circuit detects you are talking (or are in a noisy area) and it transmits and cutsoff the listening until your transmit is quiet then it switches to listenong but not transmitting.
I do not know what is "non coherent".
A microwatt transceiver uses low power for transmitting and receiving, probably with a short range.
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