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Thread: What information does the aircraft transponder send to ATC?
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Old Sep 18, 2013 | 8:18 pm
  #14  
DesertNomad
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Join Date: Jun 2008
Location: Northern Nevada
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Originally Posted by DXjr
The only data sent from a transponder to an ATC radar site is an encoded altitude and (if the plane has mode S, which all commericial aircraft should) a hexidecimal aircraft idenifier. Nothing else.

As for your link, all I see is a map.
The transponder code is actually an octal number 0000 to 7777
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