Hello Markus,
I received your VLF night transmission with Eb/N0= 1.4 dB, see
attachment.
However there was a second decode which was stronger. And the message
only decoded at a -2 second offset. So it was worth to watch the decode
or the log file. You see there was a large time offset because my FFT
covers 11.8 hours. When using the file with the lowest time offset
value, there is no decode at all. Strange things are happening here!
BTW i have analysed my local 6470 Hz EbNaut message that was recorded
on the Raspi. It decoded without problems and without time- or
frequency offsets, just like the same message from the tree. The
postprocessing was done with SL V2.90b2 and PPS+NMEA. So there seem to
be no problems, neither with the Raspi nor with the older SL version. I
still didn't get a decode from my 5 char message on 970 Hz. But i
optimised the filter/blanker settings for the best view of the carriers
in the spectrogram. The EbNaut message was more buried in the noise. So
maybe there is still some hope by trying different filter/blanker
settings.
73, Stefan
Am 10.06.2017 21:52, schrieb Markus Vester:
Sending
another short EbNaut message from Nuremberg tonight:
Frequency: 8270.1 Hz,
5 characters, 8K19A, 16 bit CRC,
20 s symbols,
start Saturday 2017-06-10 20:00 UT, end 22:50:40.
Best 73,
Markus (DF6NM)
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