File:FM radio transmitter resonant lines 1947.jpg
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| Description |
English: A 10 kW commercial FM radio transmitter produced in 1947 by Radio Engineering Laboratories, New York. The output stage shown here consists of 4 Eimac 4-1000A air cooled tetrodes driving 4 silver-plated aluminum parallel rod resonant stubs in push-pull. The 4 rods are shorted together with a strap at top to make 2 pairs of quarter-wave stubs. The 4 rod line has increased efficiency over the common 2 rod lines due to reduced electric field in the space surrounding the rods. The output stage is driven by a 750 W driver stage. Plate voltage = 4950 V, plate current = 2.48 A, grid voltage = 400 V, grid current = 400 mA, screen grid voltage = 300 V. |
| Date | |
| Source | Retrieved July 4, 2014 from Tele-Tech magazine, Caldwell-Clements Inc., Bristol, Connecticut, Vol. 6, No. 7, July 1947, p. 49 on American Radio History website |
| Author | Unknown author |
| Permission (Reusing this file) |
This 1947 issue of Tele-Tech magazine would have the copyright renewed in 1975. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1974, 1975, and 1976 show no renewal entries for Tele-Tech. Therefore the magazine's copyright was not renewed and it is in the public domain. |
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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. 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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 14:44, 2 May 2021 | | 632 × 639 (248 KB) | Materialscientist (talk | contribs) | FFT |
| 16:06, 14 October 2014 |  | 632 × 639 (124 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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