Talk:Long delayed echo

message: I have encountered LDE's on some DX stations (VE2 and western EU) from Australia over the past 6 years or so...  ie not my own echo's, but delays between the DX main signal and then replications of their signals..  
Being an engineer (PE) with a very practical bent... I simply put this down to the effects of signal progression in a waveguide - where it is possible to have a signal moving through a waveguide down to 1% to 2% of the speed of light or less...   A classical microwave worked example is referred below.
I am confident the ionosphere can 'fabricate' a sizable waveguide style duct over short periods. While this would and could easily explain a single signal delay, some discontinuity in the 'ionospheric waveguide' could generate return loss blips... hence echo's.   
Anyway, I figured I'd share my idea with you... as I sort of took this  for granted for the past 25 years that every engineering student who studied microwaves could see this phase velocity effect in practice on the HF bands. (UNSIGNED by 203.185.214.196)
TO OP: Fascinating!  — Preceding unsigned comment added by 91.190.161.223 (talk) 08:05, 5 February 2020 (UTC)
thread_title:  Possible explaination

message: On Nov. 27th there was a new evant of an LONG-DELAY RADIO ECHO. Reportetd here http://www.spaceweather.com/  —Preceding unsigned comment added by 87.189.183.33 (talk) 14:55, 1 December 2010 (UTC)
thread_title:  New event

message: I come to this by way of a 5 page description in Paul Watzlawick's 1976 book, "How Real Is Real," in which he uses the 1927-1928 Eindhoven events as an example in his discussion of communication theory. Specifically in his chapter on the difficulties that can be anticipated with extraterrestrial communications. It is the Bricewell probe theory. And, in Watzlawick's extensive footnotes there is a citation to an April 1973 article in Spaceflight, the monthly magazine of the British Interplanetary Society, by Duncan A. Lunan, titled, "Space Probe from Epsilon Boötis." This would be an acceptable citation to satisfy Wiki's need to verify, in support of a more detailed discussion of the specific 1927-1928 LDEs as a possible Bricewell probe.
Two points. 1) There is no indication that the Bricewell probe theory is offered to explain every long delay echo, and 2) regarding the 1927-1928 LDEs, Watzlawick states, "too many pieces of the puzzle fall into place for Lunan's hypothesis to be dismissed out of hand." What to do?  —Preceding unsigned comment added by Tomwfox (talk • contribs) 04:58, 2 December 2010 (UTC)
thread_title:  Non-technical point of view 

message: Hello fellow Wikipedians,
I have just modified one external link on Long delayed echo. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20080501145808/http://www.vhfdx.net/discuss/lde.html to http://www.vhfdx.net/discuss/lde.html
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 21:31, 5 January 2018 (UTC)
thread_title:  External links modified 

message: The article contains many well sourced explanations. It's unencyclopedic to promote a WP:SENSATIONAL "mystery" angle. - LuckyLouie (talk) 14:40, 14 January 2020 (UTC)
replies: text: Agree No reason for this category. David J Johnson (talk) 21:32, 14 January 2020 (UTC)
thread_title:  Category "Unexplained"? 

message: What is that? Sounds like a good subject for a new article.  — Preceding unsigned comment added by 108.54.109.52 (talk) 21:38, 18 December 2023 (UTC)
thread_title: Ionization Ducting