[ARC5] LDE

[Dennis Monticelli]

Mike,

I think somebody made a recording of you to have some fun.

Back in January I was calling a DX station repeatedly on split. You guys
know the drill. Then I was shocked to hear my own call covering up the DX
while I was trying to copy him.  It was not only my call....it was exactly
my fist.  I figured that somebody had recorded my call with one of those
new fancy rigs and re-transmitted in a way to make me look like a lid.  I
was not amused!

Dennis AE6C


On Thu, Jul 18, 2013 at 3:37 PM, Mike Everette <radiocompass at yahoo.com>wrote:

> The wildest LDE I ever experienced was on 20 meter SSB, on Field Day
> 1973.  One of my friends, sitting right next to me, called CQ, and about 30
> seconds later we both very clearly heard the transmission come back.  My
> friend didn't recognize it as an LDE and was about to answer the CQ.  My
> hair was standing up... I told him, "No -- that was YOU!"  He hesitated a
> few moments, kind of stunned, and then tried calling CQ again but the
> phenomenon never repeated.
>
> 73
>
> Mike
> W4DSE
>
>
>
>
> ________________________________
>  From: Kenneth G. Gordon <kgordon2006 at frontier.com>
> To: Bruce Long <coolbrucelong at yahoo.com>
> Cc: Arc5 at mailman.qth.net
> Sent: Thursday, July 18, 2013 12:45 PM
> Subject: Re: [ARC5] LDE
>
>
> On 18 Jul 2013 at 7:37, Bruce Long wrote:
>
> > yes I think I heard one as well and there is scientific documentation-
> > not much but some- of the phenomona.
>
> The first one I experienced was VERY clearly an LDE. I was operating as
> NCS on PAN (a CW traffic net) back in the 1960s or 1970s sometime. I was
> operating full break-in with a KW rig I had then, a TechRad T-350-XM (wish
> I
> still had that rig).
>
> I began hearing a weaker signal between my sending and I thought it was
> someone trying to break me and join the net.
>
> The signal got stronger and stronger, and I finally figured out it was my
> own
> sending coming back to me with a significant delay
>
> The echo built up to a good 579. I tested it by sending "long dots", and
> listening for the reply, which was, at its shortest, about 1/2 second or
> so, as I
> remember it.
>
> It built up to a peak in loudness, then slowly faded out and finally
> disappeared.
>
> The time between my sending and the echo became longer and longer as it
> faded out.
>
> The length of time this LDE lasted was on the order of several minutes from
> when I first heard it to its final fade out.
>
> The second such incident which occurred to me was much less "impressive",
> only lasting a few seconds, and took place at least 25 years after the
> first
> one. I don't remember much about that one, except that it did occur.
>
> What little documentation I have read on these things never really
> satisfied
> me as to the explanation of the cause. "Ducting" was one.
>
> It is still a complete mystery to me.
>
> Ken W7EKB
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