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Re: VLF: Back on 5.17 kHz / 58 km...

To: [email protected], Renato Romero <[email protected]>
Subject: Re: VLF: Back on 5.17 kHz / 58 km...
From: DK7FC <[email protected]>
Date: Sun, 01 Jan 2017 16:17:24 +0100
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
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Hello Paul, VLF,

My congrats, the message is correct! :-) The first EbNaut on 5170 Hz!!! :-)
I did not stop transmitting since friday afternoon (unfortunately this makes my LF grabber unusable). So maybe you got some first informations about propagation on 58km?
It seems to be a promising band, at least in that range of distances.

There is even a trace in Italy!!! Renato can see a trace on 5170 Hz, see
I will make QSY to 5169.99975 Hz at 16 UTC, hopefully the step becomes visible on his grabber :-)
Maybe he even received the EbNaut message? Could you check that?

The QRN levels become lower there, relative to 8270 Hz or 6470 Hz. That's not only the frequency response of my VLF RX.

BTW i sent another EbNaut message today:

f = 5170.000000 Hz
Start time: 01.Jan.2017   09:00:00 UTC
Symbol length: 20 s
Characters: 3
CRC 16
Coding 16K25A
Duration: 5h, 09m, 20s
Antenna current: ~ 200 mA

30 second symbols would have been a better choice but i had to make a quick decision :-)

73, Stefan

Am 31.12.2016 17:41, schrieb Paul Nicholson:

Stefan wrote:

> f = 5170.000000 Hz
> Start time: 31.12.2016   09:00:00 UTC
> Symbol length: 60 s
> Characters: 2
> CRC 16
> Coding 8K19A

I wrote:

> I expect an easy decode at about Eb/N0 = 4.5dB

Copied '58' with Eb/N0 = 4.5 dB, constant reference phase.

S/N: 15.06 dB in 45.3 uHz,  -62.4 dB in 2.5kHz.

Paul Nicholson

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