Mike Rawlins wrote:
Upon further review, I seem to understand the NDB
approach, and the AP waypoint GUI accepts GPS
waypoints . Regarding these approaches, from what I
can tell, it's all about the MDA and MAP!
A message on the developers group from Feb 2003
mentions a DME radio, but I can't seem to figure out
where this is on the radio stack.
DME has it's own frequency, but it is normally slaved to the VOR receiver's channel. A VORTAC has a VOR transmitter and a DME transponder at the same location (also has a TACAN, but that's for military use only.) So, if you set the NAV receiver for a nearby VORTAC, the DME will automatically pick up the associated DME transponder. (It is possible for the DME to lock onto a more distant DME transponder on the same channel, but that is a rarity except at high altitude.)
In aircraft that have remote DME indicators, there is no "DME radio". It is a hidden black box, slaved to the NAV channel, and readion distance on the remote indicator dial. On some older aircraft, there actually was a DME box, with the distance indicator, as well as some controls and a light that indicated it was receiving a response from a transponder.
Jon
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