1 a wasting away of the body, as from poor nutrition, nerve damage, or disuse. 2  to undergo atrophy; wither; degenerate:His crippled leg began to atrophy with no exercise. 3  to become weakened; decline:Industry atrophied in bad economic times.
Voice Amplifiers / Long Range Listening Devices. Listening devices can be utilized for a variety of purposes including listening through a wall, listening from a distance or enjoying your favorite animals in the wild. More complex systems contain an audio transmitter and receiver.
ANARC: Acronym for Association of North American Radio Clubs, an association of radio listener clubs in the United States and Canada. antenna tuning unit: A device installed between a receiver or transmitter and the antenna to match the radio impedance to the antenna impedance for maximum power transfer.