File:200-kw HF Alternator.jpg
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Summary
| Description |
English: Alexanderson 200-kw alternator radio transmitter installed at the US Navy's New Brunswick, NJ station, 1920. The Alexanderson alternator was an early type of radio transmitter used between 1906 and the mid 1920s, mostly at powerful governmental and Naval radio stations. It consisted of a specialized electric generator spun at extremely high speed to generate radio waves, and was one of the first continuous wave radio technologies to transmit sound (AM). In this device the rotor had 600 poles, rotated at 2170 RPM and the output frequency was 22.1 kHz. The stator was water-cooled. Alexanderson alternators were very expensive, inefficient, and finicky to adjust, and were replaced by vacuum tubes in the 1920s. |
| Date | |
| Source | General Electric Review, October, 1920, pages 794–797 |
| Author | E. F. W. Alexanderson, Chief Engineer, Radio Corporation of America |
Licensing
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.
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Original upload log
Transferred from en.wikipedia to Commons using For the Common Good.
The original description page was here. All following user names refer to en.wikipedia.
| Date/Time | Dimensions | User | Comment |
|---|---|---|---|
| 22:57, 16 January 2013 | 491 × 333 (98,254 bytes) | w:en:Delusion23 (talk | contribs) | (Cropping out Figure 2 label) |
| 20:45, 17 February 2006 | 491 × 361 (33,622 bytes) | w:en:Erzahler (talk | contribs) | (Alexanderson 200-kw generator-alternator set installed at the US Navy's New Brunswick, NJ station, 1920.) |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:57, 16 January 2013 | 491 × 333 (96 KB) | Delusion23 | Transferred from en.wikipedia: see original upload log above |
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