File:Transmitter tank coil.jpg
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Original file (1,032 × 1,420 pixels, file size: 437 KB, MIME type: image/jpeg)
Summary
| Description |
English: Double helix oscillation transformer for an inductively-coupled spark-gap radio transmitter around 1918. The spark gap and capacitor were connected with clips to the bottom primary coil to make a tuned circuit. When the spark gap triggered, current from the capacitor flowed back and forth through the coil and created damped radio frequency oscillations. The top secondary coil was connected with clips to the antenna and ground. The mutual coupling between the primary and secondary coils was adjusted by moving the secondary up (less coupling) or down (more coupling). The oscillating currents induced in the secondary were radiated as radio waves by the antenna. |
| Date | before 1918 |
| Source | Downloaded July 22,2013 from The Principles Underlying Radio Communication, National Bureau of Standards radio pamphlet no. 40, US Signal Corps. December 10, 1918, US Government Printing Office p. 372, fig. 197 on Google Books |
| Author | Unknown author |
Licensing
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:43, 27 July 2013 | | 1,032 × 1,420 (437 KB) | wikimediacommons>Chetvorno | User created page with UploadWizard |
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