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<ref name="Wightman_2017">{{cite book |author-first=Eric Jeffrey |author-last=Wightman |title=Instrumentation in Process Control |date=2017 |orig-date=1972 |edition=Revised |publisher=[[Butterworth-Heinemann]] |isbn=978-1-48316335-2<!-- 1-48316335-0 --> |chapter=Chapter 6. Displacement measurement |pages=122–123 [123] |chapter-url=https://books.google.com/books?id=8WEhBQAAQBAJ&pg=PA123 |url=https://books.google.com/books?id=8WEhBQAAQBAJ |quote=[…] Other forms of code are also well known. Among these are the [[Royal Radar Establishment]] code; The [[Excess Three decimal code]]; Gillham code which is recommended by [[ICAO]] for automatic height transmission for [[air traffic control]] purposes; the [[Petherick code]], and the [[Leslie and Russell code]] of the [[National Engineering Laboratory]]. Each has its particular merits and they are offered as options by various encoder manufacturers. A discussion of their respective merits is outside the scope of this book. […]}}</ref>
<ref name="Phillips_1998_ASCII">{{cite web |title=Altitude - MODEC ASCII |author-first=Darryl |author-last=Phillips |date=26 July 2012 |orig-date=1998 |publisher=AirSport Avionics |url=http://www.airsport-corp.com/modecascii.txt |url-status=
<ref name="Ameriking_2004">{{cite web |title=Ameriking AK-350 Altitude Encoder |publisher=Ameri-king |url=http://www.ameri-king.com/altitude_encoder.html |access-date=14 January 2018 |year=2004 |url-status=dead |archive-url=https://web.archive.org/web/20160625175313/http://www.ameri-king.com/altitude_encoder.html |archive-date=25 June 2016}}</ref>
<ref name="ACK Encoder">{{cite web |title=Model E-04 406/121.5 MHz ELT |work=Products |publisher=ACK Technologies, Inc. |date=2002 |url=http://www.ackavionics.com/products.htm |access-date=14 January 2018 |url-status=live |archive-url=https://web.archive.org/web/20180116184013/http://www.ackavionics.com/products.htm |archive-date=16 January 2018}}</ref>
<ref name="Shadin_2016">{{cite web |title=Altitude Encoder Model 8800-T Operating Manual |date=2016 |id=OP8800-TC Rev. F |publisher=Shadin Avionics |url=https://www.shadin.com/wp-content/uploads/2020/06/OP8800TC.pdf |access-date=14 January 2018 |url-status=live |archive-url=https://web.archive.org/web/20180116190458/https://www.shadin.com/documents/manuals/OP8800TC.pdf |archive-date=16 January 2018}}</ref>
<ref name="Phillips_1998_MODEC">{{cite web |title=Mode A and Mode C - The straight scoop on how it works |author-first=Darryl |author-last=Phillips |date=2012 |orig-date=1998 |publisher=AirSport Avionics |url=http://www.airsport-corp.com/modec.htm |access-date=14 January 2018 |url-status=
<ref name="Decoder Patent">{{cite book |title=Circuit for converting one code into another code |author-first=Hans |author-last=Langheinrich |publisher=[[VDO Tachometer Werke Adolf Schindling GmbH]] |___location=Frankfurt, Germany |orig-date=1971-10-27<!-- fdate --> |date=16 April 1974<!-- adate --> |id={{US patent|3805041}}. Application 192830 |url=https://patentimages.storage.googleapis.com/0a/3b/16/a511d87808faae/US3805041.pdf |access-date=14 January 2018 |url-status=live |archive-url=https://web.archive.org/web/20200805111933/https://patentimages.storage.googleapis.com/0a/3b/16/a511d87808faae/US3805041.pdf |archive-date=5 August 2020}} (7 pages)</ref>
<ref name="Stewart_2010">{{cite web |title=Aviation Gray Code: Gillham Code Explained |date=3 December 2010 |author-first=K. |author-last=Stewart |publisher=Custom Computer Services (CCS) |url=http://www.ccsinfo.com/forum/viewtopic.php?p=140960#140960 |access-date=14 January 2018 |url-status=live |archive-url=https://web.archive.org/web/20180116184525/http://www.ccsinfo.com/forum/viewtopic.php?p=140960 |archive-date=16 January 2018}}</ref>
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