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Old 9th Mar 2014, 14:56
  #879 (permalink)  
FREDAcheck
 
Join Date: Jun 2003
Location: UK
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Primary Surveillance Radar (PSR) ... is a physical 'echo' from any object within range (as already discussed, that is typically 60NM)
@andrasz

What limits primary radar to a range of "typically 60NM"? I mean, the distance to the horizon at FL350 is over 200NM, so is the range typically limited by sensitivity, or noise and clutter at low angles of elevation?
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