Posted by MarkB_MI on March 22, 2014 at 04:50:56 from (75.198.69.41):
In Reply to: Re: Lost Airliner posted by John Fulton on March 22, 2014 at 03:53:16:
John, transponders don't squawk at different frequencies, they squaw codes. The codes are from 0000 to 7777 octal, giving a total of 4096 unique codes (8 raised to the 4th power). A few codes are reserved (1200 for VFR flights, 7700 for emergency, etc.) and the rest are assigned to aircraft by ATC as they see fit.
Don't expect any changes to the existing transponder code system, even though technology exists to enhance it. The technology is quite old, based on WWII Identification Friend or Foe systems. Upgrading it would require expensive changes to all ground stations. Meanwhile, ATC technology is moving away from ground radar-based systems and going to satellite-based systems like GPS and ACARS. It's much more likely that commercial flights will be required to keep in communication with ATC using ACARS or a similar system and continually report their GPS-based location.
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