File:Ampco vario-coupler.jpg
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English: An electronic component called a vario-coupler, used in early vacuum tube radio receivers, manufactured by Ampco (American Pattern Foundry and Machine Co.), New York, from an ad in a 1922 radio magazine. The vario-coupler was an air-core RF coupling transformer with adjustable coupling. It consists of a coil of wire on a hollow cylindrical form, with a second coil of wire suspended inside on a slanted shaft. Rotating the shaft can rotate the inner coil so the angle between the axes of the inner and outer coil can be at any angle between 0° (parallel) and 90° (perpendicular), varying the coupling (mutual inductance) between the coils from maximum to near zero. |
| Date | |
| Source | Retrieved February 2, 2014 from QST, The American Radio Relay League, Inc., Hartford, Connecticut, Vol. 4, No. 2, September 1922, p. 100 on Google Books |
| Author | Unknown author |
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:11, 2 February 2014 | | 419 × 347 (22 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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