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Author Topic: Delayed Echo?  (Read 588 times)
KG6AMW
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Posts: 616




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« on: February 17, 2006, 12:55:47 PM »

I heard something strange on 75 meters Wednesday night.  When I finish my QSO and signed off, I heard my call sign. I thought someone was calling me, but it turned out to be my own voice coming back to me.  The interesting thing here is it was about an 8-10 second delay. Is it possible that it just bounced around the ionosphere for that length of time?
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WB2WIK
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Posts: 20636




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« Reply #1 on: February 17, 2006, 01:21:15 PM »

NSA stuff.  Shhhhh.

More likely it was someone who used their digital recorder and played you back.  Some rigs have this feature built-in as standard equipment.

WB2WIK/6
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W3JJH
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« Reply #2 on: February 17, 2006, 01:38:46 PM »

Don't worry, it's very rare.
 worry, it's very rare.
 it's very rare.
 very rare.
 rare.
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WB6BYU
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« Reply #3 on: February 17, 2006, 01:39:54 PM »

There have been a number of documented cases of long-delayed
echoes (LDEs) over the years - and study of them going
at least back to the 1950's if I remember.  I've heard a
number of theories about what caused them, but nothing
definite yet.  Delays of several seconds are some of the
most difficult ones to explain, as it only takes 1/7 of a
second for signals to travel around the earth.

So uncommon?  Certainly.  Unheard of?  No.

Wish I have references handy, but I don't.  You might
try searching for "long delayed echo" on the net.
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KG6AMW
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Posts: 616




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« Reply #4 on: February 17, 2006, 03:07:28 PM »

Steve, I think this was legit. When it occurred I went back checked it a half dozen times and the results were always the approximate 8 second delay.  The timing was too consistent for someone attempting a digital play back.  Dale, thanks for the info, I will reserch it on the internet.  Well anyway, back to asylum.
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N4ZOU
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Posts: 340




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« Reply #5 on: February 17, 2006, 03:31:59 PM »

The same thing happened to me on 10-meters once. This was in 1990 when the cycle was really hot. The "echo" had a strange wavering sound to it but it was I and it was about an 8 second delay as well.
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KB3LXY
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« Reply #6 on: February 17, 2006, 04:32:29 PM »

Moon bounce on 75 meters??? LOL
Smiley
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RobertKoernerExAE7G
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Posts: 1435




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« Reply #7 on: February 17, 2006, 07:38:12 PM »

Give yourself a signal report next time.

73
Bob
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W4TME
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Posts: 299




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« Reply #8 on: February 17, 2006, 08:36:32 PM »

Can you QSL yourself and have it count as award credit?  At least you can save the cost of postage

-Tim
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KB4QAA
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Posts: 2450




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« Reply #9 on: February 17, 2006, 09:37:32 PM »

I had 2 or 3 experiences with a delayed echo of about a second during the sun spot peak of 1979.  I was working CW as a Novice using a Heathkit SB-102, which was not exactly a QSK rig so there was definitely a delay.  

The occured during the winter, at night, mostly on 15M, possibly once on 40M.  The echoed signal had a soft fluttering tone and typically appeared towards the end of the QSO's.  

I felt that they were probably associated with auroral activity, but in those pre-internet days there was no way for me to know of it.

Bill
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K5DVW
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Posts: 2193




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« Reply #10 on: February 18, 2006, 07:14:02 AM »

8 seconds at the speed of light... wow, that's nearly one and a half million miles to travel one way! Now, what's out there in space bouncing those signals back? Maybe there's a big charged particle cloud out there somewhere?
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KG6WLV
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Posts: 41




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« Reply #11 on: February 21, 2006, 11:39:13 AM »

You've just heard an LDE -- Long Delayed Echo. They've been documented for decades. I heard about them on Radio Netherlands' Media Network program quite some time ago. You might do a search of their website and see if they still have anything about them.
Nobody seems to know where these things come from, but they occur on HF from time to time. My theory is that the signal is ducted somehow in the ionosphere for several orbits of the earth before scattering back to earth at the entry point.
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