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#7
August 19th 07, 01:39 PM
posted to rec.aviation.ifr
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WTF??
On Sat, 18 Aug 2007 11:50:00 -0400, NoneYa
wrote: When you use ancient technology like the FAA the comment about system overload is real and not a joke. The FAA ground DME stations routinely overload at major airports(Atlanta is real bad) because the ancient ITT equipment in the FAA facilities was only designed to simultaneously interrogate about 150 aircraft at a time. After that threshold is reached the system begins to throttle back and drop targets at the outer range of the DME equipment. In technical terms the "reply efficiency" drops. How does the system know which are the outer dme "targets"? Is it just the weaker dme transmissions that are received by the ground station that are dropped? Stan 
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