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
> --
>