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Re: LF: Europe to South America on 2200m in WSPR-15

To: [email protected]
Subject: Re: LF: Europe to South America on 2200m in WSPR-15
From: Stefan Schäfer <[email protected]>
Date: Thu, 07 Feb 2013 18:03:58 +0100
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Oh yes, the wideband window looks quite interesting on Martin's grabber: The 15 minute long dashes of the US WSPR-15 stations were clearly visible arround 137.6 kHz. Arround 3:30 UTC they AND THE QRN became much weaker. However the behaviour of the levels of DCF-39 remained normal.
When looking to http://lasp.colorado.edu/space_weather/dsttemerin/dsttemerin.html there was an event during the night that may have lowered the US signals on that path, and the QRN coming from there.
This may have improved my SNR in the next hours. Rare events and constellations.

Answer to your incoming email: The QRG is 137.615 kHz (as written in the table). I run a 50% cycle.

73, Stefan/DK7FC

Am 07.02.2013 17:52, schrieb Stefan Schäfer:
G..

The wideband and DCF plot of that time is still on the website. Martin shuts down the PC during daytime.

S..


Am 07.02.2013 17:44, schrieb Graham:
Only  a single  decode  in the  wspr  data  base , for  such a  signal  level , what  did  the  grabber  show  over  this time  period  ?
 
G..

Sent: Thursday, February 07, 2013 1:28 PM
Subject: LF: Europe to South America on 2200m in WSPR-15

LF,

I'm most excited to see that my last nights WSPR-15 transmission starting 5:30 UTC was decoded by YV7MAE in Venezuela:

Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
 2013-02-07 05:30   DK7FC   0.137615   -33   0   JN49ik   1   YV7MAE   FK81bd   7812   264 


That's a first digimode one-way between these continents on LF. The SNR wasn't even close to the decode limit. Actually the is room for another 6 dB :-) The losses here on the TX side were even quite high due to the bad WX.

Thanks to Martin/YV7MAE for running the RX system (http://dl.dropbox.com/u/74746618/LF/YV7MAE_LF_Grabber.html ) all the time and thanks to Joe/K1JT for develpoing this great software.

Image: https://dl.dropbox.com/u/19882028/LF/DL-YV.png

73, Stefan/DK7FC
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