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pscraig · June 10th, 2002, 22:02

I have heard that Mode S transponders encode much more information than a standard Mode C, but while searching the FAA registration database, I noticed *all* aircraft have an assigned, presumably predetermined, Mode S code. When ATC pings the transponder, does it reply with all of the information, or does the ATC computer have a database of aircraft information and look it up as needed?

June 10th, 2002, 22:02	#1
pscraig Senior Member Join Date: Jul 2001 Location: Houston, TX Posts: 1,021	Mode S Transponders I have heard that Mode S transponders encode much more information than a standard Mode C, but while searching the FAA registration database, I noticed all aircraft have an assigned, presumably predetermined, Mode S code. When ATC pings the transponder, does it reply with all of the information, or does the ATC computer have a database of aircraft information and look it up as needed?