File:Transmitter tuning inductor.jpg
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Transmitter_tuning_inductor.jpg (472 × 332 pixels, file size: 38 KB, MIME type: image/jpeg)
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| Description |
English: An inductor used in the output stage of a high power radio transmitter in a radio station in 1945. This is probably an antenna tuning inductance used to match the antenna to the transmitter. It shows high Q construction to prevent losses at radio frequencies:the conductor is made of large diameter tubing to reduce losses from skin effect, the turns are spaced apart to minimize losses due to proximity effect, and the coil is supported by narrow dielectric strips to minimize dielectric losses. |
| Date | |
| Source | Retrieved June 13, 2014 from Radio News magazine, Ziff Davis Publishing Co., Chicago, Illinois, Vol. 33, No. 6, June 1945, p. 99 on American Radio History website |
| Author | Unknown author |
| Permission (Reusing this file) |
This image is from an advertisement for Johnson Co. without a copyright notice published in a 1945 magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain. |
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:59, 6 September 2014 | | 472 × 332 (38 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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