Stefan wrote:

> f = 8270.1000 Hz
> Start time: 11.November.2017 17:00:00 UTC
> Symbol period: 6 s
> Characters: 300
> CRC bits: 16
> Coding 4K19A
> Duration: 12:13:36h

> message start delayed by 15 minutes...

Copied

"HELLO PAUL AND THE REST OF THE LF GROUP! WELL, THIS IS THE NEW
LONGEST MESSAGE TRANSMITTED ON VLF. THANKS TO ALL STATIONS WHO
PARTICIPATE IN THE EXPERIMENTS SINCE 2010! VLF IS A GREAT REAGION
IN THE RF SPECTRUM. WHO KNOWS WHAT WE WILL DEVELOP AND DISCOVER
IN THE NEXT TIME :-D 73 DE DK7FC IN JN49IK"

using combined 12th/13th and 13th/14th.

Constant reference phase, Eb/N0 = +1.7 dB, BER 21.4%, list rank 0
S/N -12.40 dB in 1Hz, -46.38 dB in 2.5kHz.

Each night:

11th/12th Eb/N0 = -4.4 dB, phase 101.5 deg, -18.50 dB in 1Hz;
12th/13th Eb/N0 = -2.0 dB, phase 92.5 deg, -16.07 dB in 1Hz;
13th/14th Eb/N0 = -0.6 dB, phase 100.6 deg, -14.73 dB in 1Hz;

Combinations
11/12 + 12/13: -0.1 dB (no decode up to 6E6 list);
12/13 + 13/14: +1.7 dB (decodes BER 21.4% rank 0);
11/12 + 13/14: +0.7 dB (decodes BER 22.6% rank 82);

All three: +2.6 dB;

--
Paul Nicholson
--