Re: VLF: 300 mA on 4470 Hz, 67 km band

[Paul Nicholson <vlf0403@abelian.org>]

Stefan wrote:

> f = 4470.100000 Hz
> Start time: 18.JAN.2018  16:00:00 UTC
> Symbol period: 60 s
> Characters: 2
> CRC bits: 16
> Coding 16K23A (NEW)
> Duration: 13h20min [hh:mm]
> Antenna current: 300 mA

Todmorden (881.2 km)
--------------------

 19/20 Eb/N0  +8.6 dB, S/N -27.7 dB/1Hz, phase 70.3 *Decoded*
 20/21 Eb/N0 +10.8 dB, S/N -25.4 dB/1Hz, phase 65.0 *Decoded*

Bielefeld (303.8 km DL4YHF)
---------------------------

 19/20 Eb/N0  -2.0 dB, S/N -38.3 dB/1Hz, phase -45.2;
 20/21 Eb/N0 +12.5 dB, S/N -23.8 dB/1Hz, phase -55.7 *Decoded*

Cumiana (504.6 km IK1QFK)
-------------------------

 19/20 Eb/N0  +8.9 dB, S/N -27.4 dB/1Hz, phase -116.3 *Decoded*
 20/21 Eb/N0 +11.3 dB, S/N -24.9 dB/1Hz, phase -105.0 *Decoded*

No uplink from Warsaw.

The average S/N so far at this frequency is distinctly better
than at 5170 Hz.

Todmorden: 5170 Hz -28.1 dB/1Hz;
           4470 Hz -26.5 dB/1Hz;

Cumiana: 5170 Hz -31.0 dB/1Hz;
         4470 Hz -26.2 dB/1Hz;

--
Paul Nicholson
--