Re: VLF: Finally back on the 58 km band...

[Paul Nicholson <vlf0403@abelian.org>]

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]

Now with the 4th night.  Good phase and amplitude
repeatability, except at Todmorden. The repeats
should stack very well.

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*
 26/27 Eb/N0  +3.6 dB phase 54.4, *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*
 26/27 Eb/N0 +14.6 dB phase -45.0, *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;
 26/27 Eb/N0 -0.2 dB phase -17.4, *Decoded*

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*
 26/27 Eb/N0 +2.3 dB phase -175.3, *Decoded*

> I hope your H field RX was further improved now?

As you can see, the problem with H S/N at this frequency
is still there.  I can say with confidence it is not
the rx and probably not the antenna.

--
Paul Nicholson
--