During the first two decades of the 20th century, as radio stations began to transmit in AM voice ( radiotelephony ) instead of radiotelegraphy, radio listening became a popular hobby, and the crystal was the simplest, cheapest detector.
42.
Another advantage of the circuit was that the tube could be made to oscillate, and thus a single tube could serve as both a beat frequency oscillator and a detector, functioning as a heterodyne receiver to make CW radiotelegraphy transmissions audible.
43.
Alexanderson continued improving his machine, and the Alexanderson alternator became widely used in high power very low frequency commercial and Naval wireless stations to transmit radiotelegraphy traffic at intercontinental distances, until by the 1930s it was replaced by vacuum tube transmitters.
44.
The particular reference I'm trying to create, in, is a monstrosity : " ITU Radio Regulations 1990, Appendix 13 : Miscellaneous Abbreviations and Signals to Be Used in Radiotelegraphy Communications Except in the Maritime Mobile Service ".
45.
Reports from the roughly 40 visual observation stations were sent to sector headquarters, which controlled AAA . These reports were sent by high-frequency ( HF ) Morse code radiotelegraphy, in standardized message formats where only the specific details needed to be transmitted.
46.
The Recommendation ITU-R M . 1172 lists groups of letters from QOA to QUZ as abbreviations and signals to be used in radiotelegraphy communications .'SOS'is also generally excluded, however the old distress call of'CQD'can be allocated.
47.
Robert K . Karlowa had an longtime interest in radiotelegraphy, starting in 1907, and by early 1913 was " the chief operator of the Tri-Cities Wireless club ", which met on the sixth floor of the Best Building in Rock Island, Illinois.
48.
Before AM came into wide use around 1920, the first radios transmitted information by wireless telegraphy ( radiotelegraphy ), in which the radio signal did not carry audio ( sound ) but was switched on and off to create pulses that carried text messages in Morse code.
49.
This excitation or " keep-alive " circuit was absolutely necessary for single-phase rectifiers such as the excitron and for mercury-arc rectifiers used in the high-voltage supply of radiotelegraphy transmitters, as current flow was regularly interrupted every time the Morse key was released.
50.
In order to transmit information, the continuous wave must be turned off and on with a telegraph key to produce the different length pulses, " dots " and " dashes ", that spell out text messages in Morse code, so a " continuous wave " radiotelegraphy signal consists of pulses of sine waves with a constant amplitude interspersed with gaps of no signal.
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