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Re: VLF: EbNaut tonite

To: [email protected]
Subject: Re: VLF: EbNaut tonite
From: Jacek Lipkowski <[email protected]>
Date: Thu, 25 May 2017 22:12:19 +0200 (CEST)
In-reply-to: <[email protected]>
References: <[email protected]cal> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Alpine 2.11 (DEB 23 2013-08-11)
I've tried the decoded message in ebnaut signal analysis mode, the decoder returns:
initial reference phase 45.0 amplitude 2.401e-03
carrier phase: 45.4
carrier Eb/N0: -7.1
carrier S/N: 22.50 dB in 12.6 uHz

so around 6-7dB, and it would be receivable here too. PSE QRO!

VY 73

Jacek / SQ5BPF


On Thu, 25 May 2017, Paul Nicholson wrote:

Date: Thu, 25 May 2017 19:50:31 +0000
From: Paul Nicholson <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: VLF: EbNaut tonite


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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