Transmission echos today

[RatsoW8]

I'm participating in the 13 colonies special event today and kept hearing the tail end of my exactly when I would un-key. It happened several times on 20 and 40m. I though someone was messing with me until I heard almost my full call and realized it was my voice! LOL

So I'd heard of this before but never experienced it. I Googled it and came up with LDE (long delayed echo). Interesting.

 

[rabbiporkchop]

I know a bunch of folks that have experienced that on the 11 meter band. They call it a round robin.

 

[wavrider]

RatsoW8,, you been drinking adult beverages??

Just joking.

Last time I heard a delay echo some idiot had a sadelta echo mic on his rig talking on 75 meters,he was saying breaker one nine I am looking for a professional radio check,,should have heard the cussing on that frequency.

 

[rabbiporkchop]

He said it was coming through his receiver after unkeying. sounds like skip to me. naturally there would be a delay.

 

[vkrules]

I believe you!! I've experienced LDE a few times.

No you cant just put it down to "skip".Even hearing your own sig long path only results in the last syllable then click.
How far would a radio wave have to travel for you to hear your own call back? Two three times round the earth. Some have reported 4 second delay.

It.'s one of those unexplained mysteries. and has been reported since radio began ,( so no it's not a recording either.)

 

[rabbiporkchop]

EME propagation would have a delay of 2.6 seconds. Was the delay greater than 2.6 seconds?

 

[vkrules]

Not EME. tThe return signal would be well under the noise floor on 40m ( like a hundred db or more) and thats assuming you have a 20 element yagi.

 

[vkrules]

Wonder if it's related!
"June 30, 2017 @ 16:30 UTC Possible Earth Directed CME A weak coronal mass ejection (CME) observed on June 28th is predicted to possibly deliver a glancing blow to our geomagnetic field by July 2nd. A minor geomagnetic disturbance may be possible at higher latitudes."

 

[Captain Kilowatt]

Radio waves travel completely around the world in about 0.13 seconds and EME just ain't gonna happen on 40m. The cause of LDE's has yet to be determined however their existence is very real. One theory is that the signal gets trapped in a layer similar to a waveguide and circles the earth many times before finally breaking thru to be heard.

 

[sp5it]

You just heard your signal travelled long path back to your antenna.
Easier to hear that on CW, but I heard a few times my signal when unkeyed.
That how it sounds when you receive someone LP and SP in the same time.
http://w473.wrzuta.pl/audio/9p7JvItuvsu/sn0hq_20m_iaru_contest_2005
Mike

 

[Captain Kilowatt]

You just heard your signal travelled long path back to your antenna.
Easier to hear that on CW, but I heard a few times my signal when unkeyed.
That how it sounds when you receive someone LP and SP in the same time.
http://w473.wrzuta.pl/audio/9p7JvItuvsu/sn0hq_20m_iaru_contest_2005
Mike

LDE's have a much longer delay than simple longpath or LP&SP combined. I have heard LP and SP combined and it j7st has a hollow echo sound but not delayed by several seconds.

 

[RatsoW8]

LDE's have a much longer delay than simple longpath or LP&SP combined. I have heard LP and SP combined and it j7st has a hollow echo sound but not delayed by several seconds.

Yes, agree not LP. Here's a Wiki on the subject.

https://en.wikipedia.org/wiki/Long_delayed_echo

 

[wavrider]

Interesting reading RatsoW8,,thanks for the link

 

[RatsoW8]

No echoes today but I did work the last two 13 colony stations and the two bonus stations WM3PEN and GB13COL. All on wire

 

[543_Dallas]

No echoes today but I did work the last two 13 colony stations and the two bonus stations WM3PEN and GB13COL. All on wire

I worked 2 yesterday testing a new tuner. I forgot to mail the qsl cards this morning. I'm a fan of wire myself.