[ARC5] LDE

[Christopher Bowne]

Wierdest LDE effect I ever heard was hearing my own CQ  in the receiver on 80 meters for quite a while after I had justf inished sending one.   It turned out that it was a spur radiating from a VHS video tape that my wife was watching upstairs.  The tape was recorded a few days earlier apparently while I was calling CQ then on the same frequency, and somehow the RF EMI picked up by the VCR made it onto the tape and was being reradiated on playback!




________________________________
 From: Mike Everette <radiocompass at yahoo.com>
To: "kgordon2006 at frontier.com" <kgordon2006 at frontier.com>; Bruce Long <coolbrucelong at yahoo.com> 
Cc: "Arc5 at mailman.qth.net" <Arc5 at mailman.qth.net> 
Sent: Thursday, July 18, 2013 6:37 PM
Subject: Re: [ARC5] LDE
 

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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