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- W2027991778 abstract "Relays have been used for many years in wire telegraphy and other electrical work. The practical operation of relays actuated by received radio signals is a comparatively recent development, and has been made possible by the development of the electron tube amplifier. This paper describes the development and the operating principles of a type of relay recorder which is designed to operate from the output terminals of a radio receiving set and which may also be operated by any other source of audio-frequency signal. By the use of special electron tube circuits the audio-frequency signal is caused to operate an ordinary telegraph relay. In order to avoid the necessity for using a very sensitive relay, designed to operate on currents of a milliampere or less, which would have delicate adjustments and light contacts and spring tension, advantage was taken of an electron tube amplifier, which has now become a reliable radio instrument, to increase the input voltage to the relay circuit thus making possible the use of a simple ordinary high-resistance telegraph relay. The relay device has therefore been developed to operate from the output circuit of any suitable amplifier in place of the ordinary telephone receivers. The operation of the relay may serve to work a sounder, buzzer, tape register or any mechanism for remote control by radio. Two types are described. One type is designed to be operated from batteries." @default.
- W2027991778 created "2016-06-24" @default.
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- W2027991778 date "1922-01-01" @default.
- W2027991778 modified "2023-09-25" @default.
- W2027991778 title "A Relay Recorder for Remote Control by Radio" @default.
- W2027991778 doi "https://doi.org/10.1109/t-aiee.1922.5060779" @default.
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