[Elecraft] LDEs (Long-Delayed Echos)

[Dauer, Edward]

I just finished reading Eric Nichol’s (KL7AJ) book titled Radio Science 
for the Radio Amateur, in which LDEs and other non-linear propagation 
events are discussed (ch. 11).  Eric considers some of the proposed 
explanations but concludes that none of them really work.  I heard it 
myself once on HF, during the sunspot peak many years ago.  As I remember 
it, the delay was about 1 to 2 seconds.  Truly spooky.

Ted, KN1CBR

>Message: 18
>Date: Thu, 26 Nov 2015 19:54:40 -0800
>From: Jack Brindle <jackbrindle at me.com>
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] P3 Showing Transmit Signal
>Message-ID: <D810200A-586F-4CBA-ADA1-C1F7F17FA0DE at me.com>
>Content-Type: text/plain; charset=utf-8
>
>That would be from me? Amazingly, this was on 80 meters, and was heard 
>all over the bay area up into central CA. At times the ?echo? was louder 
>than the direct signal!
>There are at least two recordings from that event. Very strange, and 
>extremely interesting. While it was ongoing, both 40 and 80 were open 
>across NA. When it stopped,
>40 collapsed to the point where the only signal heard was VY1AAA, and 80 
>became only local. In 40+ years of hamming, this is the first time I have 
>experienced anything like that.
>I have to say, it was also very cool to experience.
>
>73,
>Jack, W6FB
>
>> On Nov 25, 2015, at 11:38 PM, Bill Frantz <frantz at pwpconsult.com> wrote:
>> 
>> We had a report at the November West Valley Amateur Radio Association 
>>meeting of one member who experienced "echos" from his own CW 
>>transmissions during Sweepstakes on November 7-8. He verified by 
>>listening to another nearby station that the echo was 1/7 second later, 
>>the time for a radio signal to go around the world. The K3's full break 
>>in allowed him to hear himself between the morse code units.
>> 
>> 73 Bill AE6JV
>> 
>> On 11/26/15 at 10:25 PM, arato.andras at wigner.mta.hu (Andras ARATO) 
>>wrote:
>> 
>>> I could see this these days, but it was my signal coming back from 
>>>around the Earth when transmitting on 21 MHz. It was a good propagation 
>>>with K=1 and SFI=121. I could hear it too.
>>> 
>>> 73! de HA4AA Andras
>> 
>> -----------------------------------------------------------------------
>> Bill Frantz        | Truth and love must prevail  | Periwinkle
>> (408)356-8506      | over lies and hate.          | 16345 Englewood Ave
>> www.pwpconsult.com |               - Vaclav Havel | Los Gatos, CA 95032
>> 
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>