File:East Coast Chain Home radar station CH15176.jpg
East_Coast_Chain_Home_radar_station_CH15176.jpg (800 × 592 pixels, file size: 72 KB, MIME type: image/jpeg)
Captions
Summary[edit]
DescriptionEast Coast Chain Home radar station CH15176.jpg |
English: Royal Air Force Radar, 1939-1945 Chain Home: CH receiver room at an East Coast station, showing one of the two RF7 Receivers (left) and the Mark 3 Console (right) in use. This is typical of late-war CH stations, which had been semi-automated through the use of an analog computer referred to as the "fruit machine". On the left, the radar operator's hand is resting on the goniometer control, which allowed her to change the sensitive direction of the receiver in order to determine the bearing of the target. An additional control set an electronic pointer on the display, the "strobe", to lie over a selected target. When both the direction and range were selected, a button was pushed to send this information electrically to the fruit machine. The fruit machine then applied a number of calculations to these measures to correct for known oddities of the receiver system and geography of the local site, then translated these corrected range and direction measures into map grid references using basic trigonometry. Operators on the right would use this information to develop "tracks" for various targets, updating them on the board hanging from the right wall (only the back can be seen here). Telephones were used to send this information to the various control stations in the reporting chain. |
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Date |
between 1939 and 1945 date QS:P,+1950-00-00T00:00:00Z/7,P1319,+1939-00-00T00:00:00Z/9,P1326,+1945-00-00T00:00:00Z/9 |
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Source |
http://media.iwm.org.uk/iwm/mediaLib//39/media-39666/large.jpg
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Author | Royal Air Force official photographer | |||
Permission (Reusing this file) |
This image was created and released by the Imperial War Museum on the IWM Non Commercial Licence. Photographs taken, or artworks created, by a member of the forces during their active service duties are covered by Crown Copyright provisions. Faithful reproductions may be reused under that licence, which is considered expired 50 years after their creation. | |||
Part of InfoField | Air Ministry Second World War Official Collection | |||
Subjects InfoField |
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Category InfoField | photographs | |||
Image Sorted InfoField | yes |
Licensing[edit]
This image is in the public domain because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:
This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag. Note: This tag applies to scans and photocopies only. For photographs of public domain originals taken from afar, {{PD-Art}} may be applicable. See Commons:When to use the PD-Art tag. |
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current | 07:24, 5 February 2013 | 800 × 592 (72 KB) | Fæ (talk | contribs) | {{Information |description = {{en|''Royal Air Force Radar, 1939-1945''<br/> Chain Home: CH receiver room at an East Coast station, showing one of the two RF7 Receivers (left) and the Mark 3 Console (right) in use.}} |author = Royal Air Force official p... |
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