File:Cutlervlf.jpg
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[edit]DescriptionCutlervlf.jpg |
English: US Navy Cutler VLF Transmitter facility, Maine, as seen from across the Little Machias Bay of a distance of about 2 miles. It transmits operational orders one-way to submerged submarines worldwide at a frequency of 24 kHz with a power of 1.8 megawatts, and was at one time the most powerful radio station in the world. This type of antenna is called a trideco or umbrella antenna, a form of capacitively top-loaded monopole antenna. It consists of an array of 13 vertical steel masts attached at the top to a system of horizontal cables like an 'umbrella". The cables are divided into 6 "panels" which radiate out from the central tower in a pattern resembling a snowflake. The central mast is 979 ft (298 meters) tall, and the entire array is 6140 ft (1.871 km or 1.16 miles) in diameter. The central mast actually radiates the VLF radio waves, while the top cables form a large capacitor with the ground, which serves to increase the efficiency of the antenna. Under each mast there is also a system of cables suspended a few feet above the ground radiating from the mast base, called a counterpoise (not shown) which functions as the other plate of the capacitor. |
Date | |
Source | Own work |
Author | Noelle Keyser |
Permission (Reusing this file) |
Released into the public domain (by the author). |
Licensing
[edit]Public domainPublic domainfalsefalse |
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:29, 30 January 2012 | 2,560 × 1,920 (2.64 MB) | AndreasPraefcke (talk | contribs) | Reverted to version as of 02:21, 29 March 2008 | |
15:22, 27 June 2011 | 2,560 × 1,920 (1.46 MB) | Jakuzem (talk | contribs) | Reduced file size by selecting higher compression level. | ||
02:21, 29 March 2008 | 2,560 × 1,920 (2.64 MB) | Atlantea (talk | contribs) | {{Information |Description=The Cutler VLF Transmitter as seen from across the Little Machias Bay of a distance of about 2 miles. |Source=self-made |Date=2007-03-15 |Author= Noelle Keyser |Permission=Released into the public domain (by th |
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Camera manufacturer | Panasonic |
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Camera model | DMC-FZ5 |
Exposure time | 1/1,300 sec (0.00076923076923077) |
F-number | f/8 |
ISO speed rating | 80 |
Date and time of data generation | 15:03, 11 March 2007 |
Lens focal length | 6 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS3 Windows |
File change date and time | 22:13, 28 March 2008 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 15:03, 11 March 2007 |
Meaning of each component |
|
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 36 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Supported Flashpix version | 1 |
Image width | 2,560 px |
Image height | 1,920 px |
Date metadata was last modified | 18:13, 28 March 2008 |
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15 March 2007
image/jpeg
07dcc411f0cbc969ab0eebac2c2e3b34ee08436c
2,772,023 byte
1,920 pixel
2,560 pixel
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