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Re: VLF: EbNaut tonite

To: [email protected]
Subject: Re: VLF: EbNaut tonite
From: DK7FC <[email protected]>
Date: Mon, 29 May 2017 15:13:26 +0200
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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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