[ARC5] NDB useful range ?

[Hubert Miller]

How far can an aircraft in the air be from an NDB and the signal is still useful for homing?
Reason for my particular question: was reading a little tonite in "Survivors of Stalingrad",
Reinhold Busch, 2012. This is a collection of short accounts by German veterans of Stalingrad.
Good winter bedtime reading, if your taste goes to grim Brothers Grimm or other scary
stories. Anyway, on what was the last flight into Stalingrad, the pilot says he used a radio
beacon to point the way. I was a little surprised the Germans were able to set up a radio
beacon at emergency, extemporized airfield Gumrak. So I am wondering how far these
LF beacons are usable. I realize transmitter power varies; I would assume this one was low
powered.
thanks-   Hue Miller
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