File:Spark gap wireless station 1910.jpg
Spark_gap_wireless_station_1910.jpg (684 × 557 pixels, file size: 154 KB, MIME type: image/jpeg)
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Summary
[edit]DescriptionSpark gap wireless station 1910.jpg |
English: A typical amateur wireless telegraphy radio station from 1910. It consists of a spark-gap transmitter (on right) which generates radio waves with an electric spark, and a crystal radio receiver (on left), connected through a "transmit/receive" switch on the wall to a large outdoor wire antenna. When sending, the transmitter is turned off and on by the operator with a telegraph key on the table to produce different length pulses of radio waves, to communicate text messages in Morse code. |
Date | |
Source | Retrieved December 5, 2008 from George Washington Pierce (1910) Principles of Wireless Telegraphy, McGraw-Hill Book Co., New York, p. 322, fig. 231 on Google Books |
Author | George Washington Pierce |
Licensing
[edit]Public domainPublic domainfalsefalse |
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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Annotations InfoField | This image is annotated: View the annotations at Commons |
Induction coil steps up voltage from motor-generator to several thousand volts
Oscillation transformer
Spark gap in glass envelope
Glass plate capacitor in box forms tuned circuit with oscillation transformer
Headphones
Antenna loading coil, used to tune antenna to resonance at transmitter frequency
Crystal receiver
Transmit/receive antenna cutover switch
Motor-generator set which increases frequency of 60 Hz house current to 500 Hz to increase the spark rate giving the transmitter's signal a higher pitch in the receiver which cuts through interference better.
Hot-wire antenna current meter
Telegraph key
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current | 11:57, 3 May 2021 | 684 × 557 (154 KB) | Materialscientist (talk | contribs) | FFT | |
17:38, 19 January 2014 | 684 × 557 (124 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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