Well, the left 4 dashes must be Jay or Bob or both together. My single
decode happened about in the middle of that image, where the colour
turns from blue to purple and then back to blue. You can find a few
bright(er) pixels on the QRG to that time.
This spectrogram on the YV grabber is set to 1 Hz NBW so the SNR is not
as high as possible. However it is necessary to cover the complete LF
band in one Spectrogram with reasonable CPU load...
73, Stefan
Am 07.02.2013 18:32, schrieb Graham:
Is this you signal Stefan ?
Sent: Thursday, February 07, 2013 5:03 PM
Subject: Re: LF: Europe to South America on 2200m in
WSPR-15
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
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