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Re: LF: Odd sunset captures

To: <[email protected]>
Subject: Re: LF: Odd sunset captures
From: "Michael Sapp" <[email protected]>
Date: Thu, 03 Sep 2015 08:43:05 -0400
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
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" <[email protected]>
To: <[email protected]>
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....
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
73, Mike wa3tts

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