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RE: VLF: EbNaut tonite, 'SMS' via VLF

To: <[email protected]>
Subject: RE: VLF: EbNaut tonite, 'SMS' via VLF
From: <[email protected]>
Date: Thu, 25 May 2017 21:30:56 -0400
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Wow!

Nice work all.

Jim AA5BW

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of DK7FC
Sent: Thursday, May 25, 2017 4:32 PM
To: [email protected]
Subject: Re: VLF: EbNaut tonite, 'SMS' via VLF

Hi Paul, VLF,

That's amazing! A 'SMS' via VLF over ~ 25 wavelengths distance on the 36 km 
band, from a fixed antenna, in less than a day and without stacking! 
Again i think back to 2010 :-)
Such a result in late May! We used to say that VLF won't work in summer, 
because of the high QRN levels...
I'm impressed!

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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