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In telephony, the carbon microphone that converts sound waves into audio-frequency signals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(Russian, transmitter).(1) A telegraph transmitting device in which code combinations of the characters in the text of a telegram are automatically converted into a series of electric current impulses that are sent to a communication line. The code combinations are represented by holes in a perforated paper tape.

During the initial stage in the development of telegraphy the electromechanical transmitter invented by C. Wheatstone in 1858 was used, and the Morse code, a type of unequal-length code, was employed. By the end of the 1950’s an electromechanical transmitter employing an equal-length five-element code had come into general use. In such a transmitter the perforated tape is advanced one step for each rotation of the transmitting distributor, and brush arms “read” the next code combination from the tape; by actuating contacts the brush arms produce the corresponding five-element combination of current and no-current signals. Telegraph transmitters are designed either as an accessory for automating the operation of the keyboard of telegraph transmitting equipment or as an independent unit. The use of a transmitter makes it possible to increase the output of transmitting equipment and the efficiency with which a communication channel is used.

(2) A transmitting device in remote-control and remote-signaling systems that is used in railroad transport to transmit coded electrical signals over a track circuit.


Osnovy telegrafii i telegrafnye stantsii. Moscow, 1970.
Kogan, V. S. Telegrafiia i osnovy peredachi dannykh. Moscow, 1974.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A device that generates signals. Contrast with receiver.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
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Evaluation of transmitter attachment techniques on growth of wild turkey poults.--J.
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where X is the transmitted signal from the transmitter t and [beta] is the path-loss coefficient [11].
and Japan Airlines Co., saying flights can be conducted with portable emergency transmitters alone, according to the officials.
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