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→Decoding: none of the sources support the described theory from a forum post that 100ft is encoded separately from 500ft - see talk; the entire section probably should be deleted, a second opinion is needed Tag: Reverted |
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== Decoding ==
{{Disputed section|date=August 2022|The "Altitude Encoder" and "Decoding the Gillham Code" sections}}
Bits D2 (msbit) through B4 (lsbit) encode the pressure altitude in 500 ft increments (above a base altitude of −1000±250 ft) in a standard 8-bit [[reflected binary code]] (Gray code).<ref name="Phillips_1998_ASCII"/><ref name="Stewart_2010"/><ref name="Gray_1947"/><ref name="Steinbuch_1962"/><ref name="Steinbuch-Weber_1974"/> The specification stops at code 1000000 (126500±250 ft), above which D1 would be needed as a most significant bit.
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