Message-ID: <586A1B16.8070804@posteo.de>
Date: Mon, 02 Jan 2017 10:19:18 +0100
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
CC: Renato Romero <contact@vlf.it>
References: <159526aa32e-1297-2d056@webprd-m96.mail.aol.com> <5867AA75.6030603@posteo.de> <5867DFA9.5020604@abelian.org> <58691D84.9030201@posteo.de> <586927A4.5060400@abelian.org>
In-Reply-To: <586927A4.5060400@abelian.org>
Subject: Re: VLF: Back on 5.17 kHz / 58 km...
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Status: RO

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
> -- 
>