File:Quenched spark transmitter - Nauen Radio Station, Nauen Germany 1921.jpg
Original file (823 × 607 pixels, file size: 165 KB, MIME type: image/jpeg)
Captions
Summary[edit]
DescriptionQuenched spark transmitter - Nauen Radio Station, Nauen Germany 1921.jpg |
English: 100 kW longwave quenched spark gap transmitter at Nauen Radiotelegraphy Station, Nauen, Germany, in 1921. Built by AEG/Telefunken in 1906, this was Germany's most powerful radio station, which provided communication with the outside world during World War 1 when Germany's telegraph cables were cut. This transmitter was built in 1913 but was continuously updated with cutting edge technology. It transmitted on various frequencies between 43 and 100 kHz and had a range of up to 9000 km, sending commercial and diplomatic telegram traffic to Europe, North America and Germany's colonies in Africa by radiotelegraphy, using pulses of radio waves which spelled out text messages in high speed Morse code. The book discusses the components labeled in the picture:
(A) Four relays in the primary circuit of the transformer which keyed the transmitter, operated by a telegraph key in the operations room. |
Date | |
Source | Retrieved 26 January 2020 from Leggett, Bernard John 1921 Wireless Telegraphy, with special reference to the Quenched-Spark System, E.F. Dutton and Co., New York fig.150, following p. 296 on Google Books |
Author | Bernard John Leggett |
Licensing[edit]
Public domainPublic domainfalsefalse |
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Quenched_spark_transmitter_-_Nauen_Radio_Station,_Nauen_Germany_1921.jpg |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 14:01, 3 May 2021 | 823 × 607 (165 KB) | Materialscientist (talk | contribs) | fft | |
01:44, 27 January 2020 | 823 × 607 (129 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
The following page uses this file:
File usage on other wikis
The following other wikis use this file:
- Usage on en.wikipedia.org
- Usage on fr.wikipedia.org
- Usage on it.wikipedia.org
- Usage on nl.wikipedia.org
- Usage on www.wikidata.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Author | Chris Burks |
---|---|
Horizontal resolution | 96 dpi |
Vertical resolution | 96 dpi |
Software used | GIMP 2.4.7 |
File change date and time | 16:01, 3 May 2021 |
Unique ID of original document | xmp.did:eb480c52-dd9b-4e3f-ae3a-410c73c5989f |