[ARC5] LDE

[Dennis Monticelli]

Geoff,

Your experience on 40M sounds more like simultaneous long and short path
than LDE.  LDE delays are integer multiples of dah length. The delay due to
short vs long path is about a dit at 20 to 25wpm.  That means the dits from
the long path perfectly fill in the spaces between the dits over the short
path.  Inasmuch as short path vs long path strengths can be nearly equal
over a short stretch of time, copy becomes damn near impossible. I have
heard this phenomena many times over my ham career and several times just
this past winter on 40M at sunrise while working Europe.

Dennis AE6C


On Thu, Jul 18, 2013 at 10:55 AM, Geoff <geoffrey at jeremy.mv.com> wrote:

> Ive heard LDE's many times from 80-15M as I was obsessively active for
> decades. The strangest was on 40M one morning just past sunrise when
> Asiatic signals from JA, UA0 and similar were arriving stronger from the SW
> than the direct NW path and after their weaker direct path which had
> intense auroral flutter. If it wasnt for the yagi I used copy would have
> been very hard. Comments on the DX Packet Cluster from many with verticals
> and wires was that they couldnt even copy their own calls.
>
> Carl
>
>
> ----- Original Message ----- From: "Kenneth G. Gordon" <
> kgordon2006 at frontier.com>
> To: "Dennis Monticelli" <dennis.monticelli at gmail.com>
> Cc: <Arc5 at mailman.qth.net>
> Sent: Thursday, July 18, 2013 1:16 PM
> Subject: Re: [ARC5] LDE
>
>
>  On 18 Jul 2013 at 10:01, Dennis Monticelli wrote:
>>
>>  Ken,
>>>
>>> On what band did you experience this LDE?
>>>
>>
>> Yes. I forgot to mention that: it was on 80 meters, around 3580 Khz, as I
>> remember it.
>>
>>   I have heard LDE's on the
>>> strong signals of local DX'ers on occasion.  The band was 20M.
>>>
>>
>> Hmmm...that second one I heard may have been on 20 meters...
>>
>>  LDE's occur in integer delays of approx 128ms as I recall (the time it
>>> takes for a signal to circumnavigate the earth).  Yes, ducting is the
>>> theory usually offered.
>>>
>>
>> Thanks, Dennis. As I said, that explanation really doesn't satisfy my
>> mind on
>> it, but it may be correct.
>>
>> Ken W7EKB
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>