File:Reflex_klystrons_and_microwave_cavities.jpg
From Wikipedia, the free encyclopedia
Reflex_klystrons_and_microwave_cavities.jpg (418 × 275 pixels, file size: 18 KB, MIME type: image/jpeg)
This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
DescriptionReflex klystrons and microwave cavities.jpg |
English: Two reflex klystrons attached by waveguide to microwave cavities, from an ad by Varian, Inc. in an electronics magazine. At top is the Varian VA-1281 cavity with the VA-201 klystron, at bottom is the VA-1282 cavity and X-26 klystron. The reflex klystron is an obsolete vacuum tube used around World War 2 to produce microwaves. The microwave cavities, consisting of closed cylindrical metal containers, serve as tuned circuits, determining the resonant frequency.of the oscillators. Cavity resonators are used instead of tuned circuits at microwave frequencies because the size of discrete inductors and capacitors required would be very small. They can have much higher Q_factor than LC circuits, approaching the frequency stability of quartz crystals. |
Date | |
Source | Retrieved December 29, 2014 from Tele-Tech magazine, Caldwell-Clements Inc., New York, Vol. 14, No. 10, October 1955, p. 18 on http://www.americanradiohistory.com |
Author | Unknown authorUnknown author |
Permission (Reusing this file) |
This image is from an advertisement by Varian, Inc. without a copyright notice published in a 1955 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
Public domainPublic domainfalsefalse |
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.
العربية ∙ беларуская (тарашкевіца) ∙ čeština ∙ Deutsch ∙ Ελληνικά ∙ English ∙ español ∙ français ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ Nederlands ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ ไทย ∙ Tiếng Việt ∙ 中文(简体) ∙ 中文(繁體) ∙ +/− |
Items portrayed in this file
depicts
October 1955
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 12:31, 25 May 2015 | 418 × 275 (18 KB) | Chetvorno | User created page with UploadWizard |
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):
Global file usage
The following other wikis use this file:
- Usage on ca.wikipedia.org
- Usage on fr.wikipedia.org
- Usage on hi.wikipedia.org