File:VLF umbrella antenna - Anthorn Radio Station UK - central mast.jpg
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DescriptionVLF umbrella antenna - Anthorn Radio Station UK - central mast.jpg |
English: Central mast of the huge wire trideco antenna of the very low frequency (VLF) naval radio transmitter at Anthorn Radio Station, Anthorn, UK, used by the British Navy to communicate with submerged submarines. This facility was actually under the command of NATO, and in a nuclear war would be used to transmit missile launch orders to ballistic missile submarines. It transmits on 19.6 kHz with a callsign of GQD with output power of 550 kilowatts. The antenna consists of six vertical wire radiators (two are visible in the photo) driven at the base of the mast, attached at the six insulator strings visible to six 2148 foot rhombic-shaped horizontal multiwire toploads. These extend at angles of 60° from the central mast, supported by 12 surrounding masts, giving the antenna the shape of a 6-pointed star when viewed from above. The entire antenna is more than a mile in diameter. The standing waves on the high Q antenna create very high voltages on the topload wires, requiring long insulator strings with corona rings at each end to stand the voltage. |
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This file was derived from: Anthorn Radio Station central mast (geograph 3354038).jpg |
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current | 04:15, 11 August 2019 | 4,592 × 3,448 (1.54 MB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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Camera manufacturer | Panasonic |
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Camera model | DMC-G3 |
Exposure time | 1/800 sec (0.00125) |
F-number | f/7.1 |
ISO speed rating | 160 |
Date and time of data generation | 11:40, 2 March 2013 |
Lens focal length | 109 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | GIMP 2.10.12 |
File change date and time | 11:09, 5 August 2019 |
Y and C positioning | Co-sited |
Exposure Program | Landscape mode (for landscape photos with the background in focus) |
Exif version | 2.3 |
Date and time of digitizing | 11:40, 2 March 2013 |
Meaning of each component |
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Image compression mode | 2 |
APEX exposure bias | 0 |
Maximum land aperture | 4.55859375 APEX (f/4.85) |
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 | 218 mm |
Scene capture type | Standard |
Scene control | Low gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |