Thank-you Paul, Wolf and Markus for your sotware advice and assistance.
I have rsNTP running on the pc and the SR calibrated at 12k. The next
step is setting up SL frequency offset detector to compensate for
the RX (FT-817) drift.
Should rsNTP be left running in the background while SL is tasked with
EbNaut and would it be OK to calibrate at a higher SR for
future experiments on VLF (8.277 kHz)?
On Mon, 12 Dec 2016, Paul Nicholson wrote:
Well done with this - a great result and close to the limit.
A distance of 4555km.
12110608_result.png
12110608_sym.png
Always fascinating to see a message decoded from a signal that
is quite invisible. No trace of the squared carrier or any
sign of an axis to the symbol plot, so impossible to extract
a reference phase.
This is a good use of EbNaut - it needed both list decoding
and a full reference phase search. S/N was about -48dB in
audio bandwidth. I don't know if any other mode could have
got a message through.
There is probably some other signal within the bandwidth of the
wav file, hence the -4dB Eb/N0 estimate from the carrier S/N.
Usually the carrier derived Eb/N0 is more accurate than the
Eb/N0 estimated from the BER, but not so when the input file
contains other signals.
--
Paul Nicholson
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