Several articles on LDE were published at Antentop
(use google search engine to find all articles at the site). Evidence
of different people from different countries shows that LDE is
not a myth, LDE is the reality.
Subject "LDE" at www.qrz.com was appeared at hot summer 2007. Lots
interesting commentaries were at the topic. Some of the replies
(thanks for courteously permission of the authors) were pasted
ball to reality of the LDE
Posted:July 09 2007,
I also experienced an LDE while working for the US government, in the mid 1960s.
It was on CW.
It was only a portion of a regular one-minute long transmission
we made, automatically, on a guard frequency. Our guard
sent one minute of CW then one minute of monitoring. We
monitored simultaneously four different HF frequencies, on speaker
monitor, as we were often away from the operating console.
one of the one-minute transmissions, a few seconds after it stopped,
part of that transmission was repeated back, but since I was not
at the console I do not know on which receiver it was heard. At
the time we were monitoring frequencies at 6, 10, 13, and 18 mhz.
My guess would be the 13 mhz frequency, but it is only a guess.
The duration of the echo was only about 10-12 seconds, not a complete
retransmission. It had no fade. It was on frequency,
so was not shifted by any Doppler.