Hi Paul,
I wonder why the reference phase was constant, because we used day and
night for the transmission. Do you stop the decoder when you get a valid
result or do you let it run until the process is completed? I would
expect a phase shift between day and night...
73, Stefan
Am 25.05.2017 21:50, schrieb Paul Nicholson:
Stefan wrote:
> Well, let's try something for the record list again:
> f = 8270.100000 Hz
> Start time: 24.May.2017 20:00:00 UTC
> Symbol period: 10 s
> Characters: 160 ( 1 SMS length :-) )
> CRC bits: 10
> Coding 8K21A
> Duration: 22h
Copied
"THIS IS THE FIRST SMS SENT OVER VLF BY RADIO AMATEURS.
THANKS TO PAUL NICHOLSON, DL4YHF AND DF6NM FOR SOFTWARE
DEVELOPMENTS. JOIN IN THE EXPERIMENTS! 73, DK7FC"
Rank 0, constant reference phase;
Eb/N0 = +0.6 dB;
BER 27.3%;
carrier S/N: 30.17 dB in 12.6 uHz,
-18.81 dB in 1Hz,
-52.79 dB in 2.5kHz;
That's a new record message length for VLF.
--
Paul Nicholson
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