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Add picture of typical alt encoder. |
actually the info box is for the article, the picture is just illustrative, image formating |
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{{Infobox aviation
|name=
|image=Image:CessnaARC-RT-359ATransponder04.jpg
|caption=A Cessna ARC RT-359A [[Transponder (aviation)|transponder]] (the beige box) in the instrument panel of a [[Grumman American AA-1|American Aviation AA-1 Yankee]] light aircraft. The transponder gets its altitude information from
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== Altitude Encoder ==
[[Image:ACK A-30 Altitude Encoder 2.jpg|thumb|right|
▲|caption=A typical altitude encoder, the ACK Technologies A-30. Note the 15 way D-type connector to send the Gillham code to the transponder and the port on the top of the case that connects to the aircraft's static pressure system.
An altitude encoder takes the form of a small metal box containing a pressure sensor and signal conditioning electronics.<ref name="Ameriking Encoder"> [http://www.ameri-king.com/altitude_encoder.html Ameriking AK-350 Altitude Encoder] </ref><ref name="ACK Encoder"> [http://www.ackavionics.com/products.htm ACK A-30 Altitude Encoder] </ref> The pressure sensor is often heated which requires a warm up time during which height information is either unavailable or inaccurate. Older style units can have a warm up time of up to 10 minutes, more modern units warm up in less than 2. Some of the very latest encoders incorporate unheated 'instant on' type sensors. During the warm up of older style units the height information may gradually increase until it settles at its final value. This is not normally a problem as the power would typically be applied before the aircraft enters the runway and so it would be transmitting correct height information soon after take off.<ref name="Shadin Manual">[http://www.shadin.com/service/manuals/OP8800TC.pdf Shadin 8800-T Altitude Encoder Operating Manual]</ref>
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