File:Dipole array TV broadcast antenna.jpg
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Summary
| Description |
English: Dipole panel array TV broadcast antenna from 1963 advertisement in broadcasting magazine. This example is for use on the analog VHF low band (Band 1), channels 2 - 6, frequencies of 54 - 88 MHz. It comprises four panels mounted on the four sides of the tower, each consisting of a 2x16 array of broadband dipole antennas mounted in front of a flat reflective screen. The column of dipoles serves to concentrate the radiated power in the horizontal direction to cover the viewing area, with little power radiated into the sky or down toward the earth and wasted. Caption: Low band broadband dipole antennas for channels 2-6. Gains to 10.3. VSWR of 1.04. |
| Date | |
| Source | Retriever May 31, 2015 from Broadcast Engineering magazine, Howard W. Sams Co., Indianapolis, Indiana, Vol. 5, No. 6, June 1963, p. 8 on http://www.americanradiohistory.com/ |
| Author | Unknown author |
| Permission (Reusing this file) |
This image is from an advertisement by Coel Co. without a copyright notice published in a 1963 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. |
Licensing
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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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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:57, 1 June 2015 | | 410 × 750 (55 KB) | Chetvorno | User created page with UploadWizard |
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