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In telephony, the carbon microphone that converts sound waves into audio-frequency signals.



(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.



A device that generates signals. Contrast with receiver.
References in periodicals archive ?
Since I remembered that the first VOA broadcasts were sent via radiotelephone to the BBC in London from where they were retransmitted to Europe on BBC medium wave transmitters, I decided to ask the BBC whether their archives could ascertain the date of the first VOA broadcast.
The Project has supported PBC and Radio Pakistan Islamabad in replacing old medium wave transmitters in Faqirabad with high powered dual mode transmitters and renovated a master control room and five studios of National Broadcasting House, Islamabad.
An official source informed that FM transmitters are not being given priority to medium wave transmitters. Both are utilized separately as per need basis, according to their specifications.
Here are a few ideas of what I think the BBC might do, but this is only my opinion: If they could switch off local medium wave transmitters and merge some of the frequencies it would save a lot of money.
Ather major allocations include Rs 100 million for replacement of medium wave transmitters at Mirpur and Rs 75 million for ungradation of monitoring system upto 250 television channels.
The project has supported PBC and Radio Pakistan Islamabad for replacement of old medium wave transmitters in Faqirabad with high powered dual mode transmitters and has upgraded a master control room and five studios of National Broadcasting House, Islamabad.
Marathon transmission on nation hook-up will be aired by NBS, FM-93, and FM-101 networks, as well as by Medium wave transmitters except FM-94.
He said Radio Pakistan has signed an agreement with Japan International Cooperation Agency for installing a state of the art 500 KW medium wave transmitters at Faqirabad in Attock District, which will boost medium wave transmission of the organization in the country.
Responding to question by a listener, he strongly dispelled the impression that medium wave transmitters are being closed and said there are parts of the country especially Balochistan where even thousands of FM transmitters would not perform the job that a few medium-wave transmitters can.

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