Hello Paul,
Something went wrong. The transmission should have stopped at 11:48:16
UTC. But the PSK continues. Obviously i made a mistake. The symbol time
is correct, one can also see it by the psk sidebands which have a null
in +- 0.25 Hz 'distance' to the center frequency
(http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html
).
I checked the txt file for the transmission, it contains 4384 symbols.
That would fit the number of seconds for a 40 character message
when all other parameters are set as announced. That transmission would
stop at 12:52:16 UTC. The expected Eb/N0 would be even 0.2 dB
lower. Let's just try and see what happens. I can give you the txt file
for analysis if we can't manage a decode, then we at least see what
went wrong...
So, an even higher challenge!
73, Stefan
Am 19.04.2017 11:19, schrieb Paul Nicholson:
Yes it looks borderline. But the blanker setting I used
for the carrier measurements was appropriate for nighttime.
I can probably gain a dB or two when I decode the EbNaut
by using a daytime threshold.
So, cautiously optimistic on this one.
--
Paul Nicholson
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