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Thread: Transponder Mode A and TA
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Old 8th April 2009 | 16:19
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Graybeard
 
Joined: Nov 2006
Posts: 896
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From: SoCalif
TCAS measures slant range to a mode A target, just like DME. Assuming they are not at same altitude, the rate of closure will decrease, and the target may disappear, or actually move around at the slant range distance when crossing over.

GB
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