Re: VLF: IW4DXW 8270.003 Hz

[Riccardo Zoli <riccardozoli80@gmail.com>]

A new transmission is starting at 13:00 UTC. Antenna current: 600 mA.

73 de Riccardo IW4DXW

Il Ven 5 Ott 2018, 08:13 Riccardo Zoli <riccardozoli80@gmail.com> ha scritto:

A new transmission is starting at 06:30 UTC.

73 de Riccardo IW4DXW

Il Gio 4 Ott 2018, 21:43 Riccardo Zoli <riccardozoli80@gmail.com> ha scritto:

Ok, Stefan, thanks. I'm ready:

Start at 00:00 UTC (5 Oct)

Coding 16K21A

CRC 16

20 sec/sym

6 char

Duration 6 h, 24 min

...hoping the noise remains low.

73, Riccardo IW4DXW

Il Gio 4 Ott 2018, 21:25 DK7FC <selberdenken@posteo.de> ha scritto:

Hi Riccardo,

now i switched to the N-S loop in the 424 uHz window. It may give the best result in the spectrogram.
If you like to try a message, don't hesitate :-)

73, Stefan

Am 04.10.2018 00:30, schrieb Riccardo Zoli:

Hi Stefan, VLF

Thanks, Stefan! It's a good news for me.

Unfortunately tonite I can't mantain a good antenna current, now it's slightly oscillating around 525 mA. Anyway, I'm still on air with a continuous carrier.

Thanks again and have a good night.

All the best

73 de Riccardo IW4DXW

Il Gio 4 Ott 2018, 00:06 DK7FC <selberdenken@posteo.de> ha scritto:

Hi Riccardo,

The noise at night has not been unusual high. Today it was very quiet in daytime however. Ich searched for your signal in daytime, from 6...16 UTC:
N-S loop: 15.45 dB in 27.9 uHz
E-W loop: 4.52 dB in 27.9 uHz
E field: 6.98 dB in 27.9 uHz
...so the signal is there, on the N_S loop. I will try to combine the signals to form a cardioid into your direction but my PC is very slow. So this is just a first positive feedback for tonite.
I'm sure it would work to decode your callsign or another message with the same length...

Thanks for the signal, useful for learning...

73, Stefan

Am 03.10.2018 17:14, schrieb Riccardo Zoli:

Yes, Stefan: I'm still on air.

My working conditions are the same they were in my last VLF transmissions (7-13 May). How about noise?

Thanks for report.

73 de Riccardo IW4DXW

Il Mer 3 Ott 2018, 16:36 DK7FC <selberdenken@posteo.de> ha scritto:

Ciao Riccardo,

Thanks for the signal.
Somehow i did not see it on my grabber.
I analysed 6 hours starting 21 UTC, for the N-S loop and the E field
(separately) but i don't get a significant SNR.
Did you actually transmit during that time, i.e. went all well?

73, Stefan


Am 02.10.2018 20:07, schrieb Riccardo Zoli:
>
> Hi VLF,
>
> I'm putting on air a continuous carrier started at 17:30 UTC.
> Current is about 570 mA on my inverted "L".
> As usual, reports are welcome.
>
> All the best
>
>
> 73 de Riccardo IW4DXW
>
>
>