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Old 2nd Aug 2020, 06:14
  #75 (permalink)  
illusion
 
Join Date: Oct 2006
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Here is a Wikipedia clue.....

Jindalee Operational Radar Network (JORN) is so sensitive it is able to track planes as small as a Cessna 172 taking off and landing in East Timor 2600 km away.[citation needed] Current research is anticipated to increase its sensitivity by a factor of ten beyond this level
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