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Old 20th May 2021, 20:22
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Dan Dare
Join Date: May 2000
Location: SE England
Posts: 636
I'm no expert, but I think if you look at the aerodrome charts you will still see a DME transmitter somewhere near the mid-point of the runway. That would be quite clever so you only need (the costs and complexity of) one transmitter aerial to do both directions. The clever bit is merely tweaking appropriate DME timing so that it shows zero at e.g. the threshold.
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