File:C G-K - DSC 0442 (by).jpg
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DescriptionC G-K - DSC 0442 (by).jpg |
English: Front view of antennas of the Allan Telescope Array, a radio telescope for combined radio astronomy and SETI (search for extraterrestrial intelligence) research being built by the University of California at Berkeley, outside San Francisco. The first phase, consisting of 42 6-meter dish antennas shown here, was completed in 2007. Eventually it will have 350 antennas. This type of antenna is called an offset Gregorian design. The incoming radio waves are reflected by the large parabolic dish onto a secondary parabolic reflector in front of the dish, and then into a feed horn. A metal shroud along the bottom of the secondary reflector shields the antenna from ground noise. It covers the frequency range from 0.5 to 11.2 GHz. |
Date | |
Source | DSC_0442 |
Author | Colby Gutierrez-Kraybill |
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This image, originally posted to Flickr, was reviewed on September 29, 2008 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:22, 29 September 2008 | ![]() | 3,888 × 2,600 (2.37 MB) | File Upload Bot (Magnus Manske) (talk | contribs) | {{Information |Description= |Source=[http://www.flickr.com/photos/69043449@N00/1558791338/ DSC_0442] * Uploaded by ComputerHotline |Date=October 11, 2007 at 10:56 |Author=[http://www.flickr.com/people/69043449@N00 Colby Gutierre |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D40X |
Exposure time | 1/160 sec (0.00625) |
F-number | f/6.3 |
ISO speed rating | 100 |
Date and time of data generation | 10:56, 11 October 2007 |
Lens focal length | 50 mm |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Ver.1.00 |
File change date and time | 10:56, 11 October 2007 |
Exposure Program | Not defined |
Date and time of digitizing | 10:56, 11 October 2007 |
APEX exposure bias | 0 |
Maximum land aperture | 1.6 APEX (f/1.74) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
DateTime subseconds | 00 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 75 mm |
Scene capture type | Standard |
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Saturation | Normal |
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Subject distance range | Unknown |