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

To: [email protected]
Subject: Re: VLF: Back on 5.17 kHz / 58 km...
From: DK7FC <[email protected]>
Date: Mon, 02 Jan 2017 10:19:18 +0100
Cc: Renato Romero <[email protected]>
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
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Hi Paul, VLF,

Many thanks for the decode and analysis of Renatos data!
Well, 517 is correct of course. But HNY would have been the better choice for a message. But i just woke up 4 minutes before 9 UTC and had to make quick decisions :-)
You already proved that Renato receives my signal (not a 1PPS harmonic
crosstalk from the other soundcard channel). The frequency shift of -250
uHz is now also visible on his grabber:
http://www.webalice.it/rromero/live_cumiana/last-LFtest_8970-6470.jpg
Now it is snowing and the antenna current falls below 150 mA,
http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/TX.png
When the WX is better again i will further improve the coil and i think
i can manage a stable 230 +- 10 mA then.
With this signal it should be possible to transfer 5 characters (e.g. my
call) to you in a single day when using 16K25A.
73, Stefan

Am 01.01.2017 17:00, schrieb Paul Nicholson:
Stefan wrote:

> There is even a trace in Italy!!!

Distance 504.6km to Renato Romero's online receiver 'vlf15'
at Cumiana via http://abelian.org/vlf

> Maybe he even received the EbNaut message?

Easy decode from the recording of vlf15 (this is after a stage
of vorbis compression and decompression).

'58' with constant reference phase.

Carrier Eb/N0: 4.2
Carrier S/N: 14.75 dB in 45.3 uHz,  -62.7 dB in 2.5kHz.

Interesting.  At 6140 and 8270 your signals at Cumiana vlf15
are usually a few dB weaker than at Todmorden (Cumiana land path
and E-field only).  Not so on this occasion.

> f = 5170.000000 Hz
> Start time: 01.Jan.2017   09:00:00 UTC
> Symbol length: 20 s
> Characters: 3
> CRC 16
> Coding 16K25A

Signal calculator predicts 1.6 dB.

Copied '517', constant reference phase.

Carrier Eb/N0: 2.0 dB
Carrier S/N: 14.31 dB in 53.9 uHz,  -62.3 dB in 2.5kHz.

Expect Cumiana also got it, will check that next.
--
Paul Nicholson
--





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