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Date: Wed, 27 Dec 2017 14:55:37 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: VLF: Finally back on the 58 km band...
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Thanks for that summary Paul.

Especially the good SNR at IK1QFK is impressing! He will have no problem 
to receive the following 12 character message i guess, when stacking 2 
or 3 days.

So far i transmitted the message 4 times. That could be enough but Alex 
told me he will visit the garden tomorrow or Friday, so i better run 
some more transmissions so we get a very clear decode.
He already sent me 2 txt files and i could have a look into them. On the 
23th, the message is a -5.0 dB, on the 24th it is at -8.0 dB. Combined 
is at -3.6 dB. So this looks promising and as expected.

Since October it was my goal to send a 12 char message on 5170 Hz over 
to Moscow before i QSY to 4470 Hz. This may take 2 weeks but i think i 
will do it anyway. There will still be enough time to experiment on the 
lower frequencies.
Maybe the periodic transmissions will be interrupted for some days on 
970 Hz! I hope your H field RX was further improved now?

73, Stefan


Am 26.12.2017 08:06, schrieb Paul Nicholson:
>
> Stefan wrote:
>
> > f = 5170.1000 Hz
> > Start time: 23.Dec.2017  15:30:00 UTC (daily)
> > Symbol period: 60 s
> > Characters: 3
> > CRC bits: 11
> > Coding 16K21A
> > Duration: 13:04 [hh:mm]
>
> Results from the sites I have signal data for:
>
> Todmorden (881.2 km)
> --------------------
>
>  23/24 Eb/N0 +10.6 dB phase 43.4, *Decoded*
>  24/25 Eb/N0 +11.8 dB phase 45.7, *Decoded*
>  25/26 Eb/N0  +3.4 dB phase 32.8, *Decoded*
>
> Bielefeld (303.8 km DL4YHF)
> ---------------------------
>
>  23/24 Eb/N0 +16.1 dB phase -51.2, *Decoded*
>  24/25 Eb/N0 +15.7 dB phase -50.2, *Decoded*
>  25/26 Eb/N0 +15.0 dB phase -50.8, *Decoded*
>
> Warsaw (919.3 km SQ5BPF)
> ------------------------
>
>  23/24 Eb/N0 -4.3 dB phase -37.4;
>  24/25 Eb/N0 +2.2 dB phase -13.5, *Decoded*
>  25/26 Eb/N0 -3.1 dB phase  -2.5;
>
>  First Germany to Poland message on 58km band.
>
> Cumiana (504.6 km IK1QFK)
> -------------------------
>
>  23/24 Eb/N0 +5.0 dB phase -173.0, *Decoded*
>  24/25 Eb/N0 +4.2 dB phase -176.9, *Decoded*
>  25/26 Eb/N0 +2.4 dB phase +165.2, *Decoded*
>
>  First Germany to Italy message on 58km band.
>
> -- 
> Paul Nicholson
> -- 
>