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post #28 of Old 09-13-2006
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Just to be nitpicky , a simplex unit is one where the communication goes only one way i.e. a fire alarm box where you pull the handle and the alarm goes off at the fire station. A VHF or SSB radio is a half-duplex unit that can either transmit or receive but not both at the same time. Full duplex is illustrated by a telephone where transmit and receive happen at the same time.
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