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
|
|
