Gillham code

Gillham code
Digits12
Tracks9..11[1][2]
Continuityno
Cyclicyes
Minimum distance1
Maximum distance1
Lexicographyno
A Cessna ARC RT-359A transponder (the beige box) in the instrument panel of an American Aviation AA-1 Yankee light aircraft. The transponder gets its altitude information from an encoding altimeter mounted behind the instrument panel that communicates via the Gillham code.

Gillham code is a zero-padded 12-bit binary code using a parallel nine-[1] to eleven-wire interface,[2] the Gillham interface, that is used to transmit uncorrected barometric altitude between an encoding altimeter or analog air data computer and a digital transponder. It is a modified form of a Gray code and is sometimes referred to simply as a "Gray code" in avionics literature.[3]

  1. ^ a b Cite error: The named reference Honeywell_2002 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tooley-Wyatt_2009 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Phillips_1998_MODEC was invoked but never defined (see the help page).