Message-id: <0981E79236EE4643B62A60EC21CA1407@MichaelSappPC>
From: "Michael Sapp" <wa3tts@verizon.net>
To: <rsgb_lf_group@blacksheep.org>
References: <BCD71DC47DD24A84B6EC3430360D270B@MichaelSappPC>
 <55E834F5.5050008@gmx.net>
In-reply-to: <55E834F5.5050008@gmx.net>
Date: Thu, 03 Sep 2015 08:43:05 -0400
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Subject: Re: LF: Odd sunset captures
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Tobias: Thank you for the explanation, I was aware of the multi-part 
transmission format, but not sure of the significance in this capture 
instance.

73, Mike wa3tts

----- Original Message ----- 
From: "Tobias DG3LV" <DG3LV@gmx.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, September 03, 2015 7:54 AM
Subject: Re: LF: Odd sunset captures


> Hi Mike !
>
> Your screenshot shows Stefan's Callsign as "<DK7FC>". This means it was 
> (identified as) one part of a multi-part transmission. To correlate those 
> sequential transmissions WSPR uses a hash-table to identify the 
> corresponding parts. In your case the 23:04 reception was erroneously 
> correlated to a prior(!) transmission of Stefan. As the "decoded" grid is 
> not a legal gridsquare, you can be shure the decoding is one of the rare 
> incidents, where the significance threshold of the WSPR-decoder was still 
> too low to eliminate false decodings. This happens from time to time, but 
> you can identify those easily by inspecting the callsign or the gridsquare 
> which are either illegal or implausible.
>
> 73 de dg3lv Tobias
>
> Am 03.09.2015 um 02:18 schrieb Michael Sapp:
>> Hi All: I'm not sure what to think of this....
>> https://www.dropbox.com/s/xwnopmbl2fz5ye5/IMG_4537.JPG?dl=0
>> I have been experimenting with IF shifting my radio to get WG2XJM very
>> strong signal 10 to 13 dB down the IF bandpass
>> curve to improve weak signal reception of other stations when Eric is
>> transmitting.  Odd sunset partial captures appear
>> to be transatlantic, but I am not sure about reality with this data. My
>> EWE antenna was configured to favor a SE direction, but with
>> 120 degree 3dB beam width pattern it covers the NE as well.   Long
>> distance transition zone propagation is a possibility, but I
>> would be hesitant to claim it not having received correct grid square
>> information......
>> 73, Mike wa3tts
>