Electronics (Mike Jaroch)
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DUMMY ANTENNASee DUMMY LOAD [16]. | ||
DUMMY LOADA dissipative but nonradiating device that has the impedance characteristics of an antenna or transmission line. Also called ARTIFICIAL LOAD [11] [16] [17]. | ||
DUPLEXERA radar device that switches the antenna from the transmitter to the receiver and vice versa [18]. | ||
DUTY CYCLEIn a transmitter, ratio of time on to time off [12] [18]. | ||
DYNAMIC MICROPHONEA device in which sound waves move a coil of fine wire that is mounted on the back of a diaphragm and located in the magnetic field of a permanent magnet [12]. | ||