File:NRAO Calibration Horn Antenna (1967).jpg
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English: The Calibration Horn Antenna, nicknamed the “Little Big Horn,” at Green Bank. As its name implies, this 120-foot long horn antenna was used to measure the intensity of radio waves coming from the sky’s strongest non-solar radio source, Cassiopeia A. The Calibration Horn measured a total power output for Cas A at a frequency of 1.4 GHz (a wavelength of 20cm), and thus provided astronomers with a standard reference point on the sky against which they could measure other sources. |
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| Source | https://public.nrao.edu/gallery/little-big-horn/ |
| Author | NRAO/AUI/NSF |
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Attribution: NRAO/AUI/NSF
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 12:51, 5 May 2021 | | 1,920 × 1,485 (1.43 MB) | Sv1xv (talk | contribs) | Uploaded a work by NRAO/AUI/NSF from https://public.nrao.edu/gallery/little-big-horn/ with UploadWizard |
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