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COLC server MARTIN

COLC Colc Server Africa
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COLC Colc Server Cambridge
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COLC Colc Server Christian
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COLC Colc Server Martin
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CV Software Martin software development engineer
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MILTON Milton Map amd Aerial photos
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NO GLASSES You Don't Need Reading Glasses !
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WEATHER Weather Forecaster Martin http://cambonli01.uuhost.uk.uu.net/forum/buchan/vw/weahome.htm

WEBPAGES Martin's Websites 2007, webdata.js
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WEB ADDRESS CARD Martin's Web address card
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COUNCIL TAX Council Tax doubles every 8 Years
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CV RF Martin radio frequency design engineer
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FAMILY Joyce and Martin's Family
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HEARING Test your hearing Cambridge Kits
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      I tried to remember what it was. Colonel Kim turned to some photos at the back of the report. "The Germans did not have a thing called a Transmitter Receiver cell, which was invented in Britain. The TR cell allows both the radar transmitter and receiver to use the same antenna. The TR cell is filled with neon gas which strikes, and the electrical conduction of the gas protects the sensitive receiver from the powerful pulses of microwave energy coming from the transmitter. Having a common antenna for the transmitter and receiver makes the whole process of deciding where the aircraft is so much simpler. However, the German Würzburg and Freya radars, without the TR cell, had to use separate transmitter and receiver antennas, and keeping them both pointing in exactly the same direction was much more of a problem."
      Surely they are not taking my story seriously ? I could feel myself sweating slightly.
      "It is lucky that you had studied older radar systems, because that seems to be what gave you the idea for countermeasures against the stealth bomber," said Colonel Kim, smiling. "The stealth bomber is made in an unusual shape to minimise the radar signal from it, but this shape only minimises the signal reflected back to the radar transmitter. There is still a lot of radar signal that is reflected off the aircraft in other directions, and in particular scattered forwards away from the radar. This is in spite of all the Radar Absorbing Material covering the aircraft. The RAM is especially designed to reduce this forward scattered signal, but even when the RAM is dry it probably absorbs only about ninety percent of the signal. The remaining ten percent is still strong enough to be useful, and that is what our system uses."
      "Captain Jang has deployed many low-cost SAM trucks all around the countryside, with their surveillance transmitters switched off so that the enemy cannot home on to them, and listening for aircraft forward scatter signals produced by some of our other SAM radars. All these signals are continually sent to a central computer, something the Germans never had of course, which can then calculate where the aircraft is. The computer does this by comparing the different time delays - rather like the techniques used in radio astronomy. When we know where the aircraft is we can track it, and when we can track it we can launch a missile against it. All our system needs is a short run by one of our own aircraft for position calibration, and we can even use the American satellite Global Positioning System to help us with that !"
      They're mad. It was only a story. "You have actually built this system ?" I asked incredulously.
      "Well, almost. We can track a small radio controlled aircraft, the Jindivik, which you may remember was used for target practice many years ago. We are fairly confident that the forward scatter signal is no more than that from the F-117, but our remaining problem is finding at what height it is flying. This is especially important in a hilly country like ours. Anyway, you can talk to Captain Jang about that tomorrow."