RE: LF: EbNaut on LF

[VIGILANT Luis Fernández <luis@vigilant.es>]

Thank you for the signal Domenico

 

Unfortunately no decode, but this helped me to identify some problems here in my Rx

First is the VAC problem. What I get from 11.904 Alpha at 3.5mHz FFT is a bunch of carriers

as you can see in my grabber (scroll down to VLF screen)

https://ea5dom.ure.es/grabber/index.html

 

Getting the stronger carrier as reference I calibrated SL sample rate. The result is probably

acceptable, as I have got some peaks from Domenico's signal at the right time slots

This were observed using Show_ramsys. But the peak is wide and not a sharp mark as shown

in the examples provided by Markus, which have been my routing map (thank you !)

 

I think the best file is 04242231 and produced this graphic in Show_ramsys

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/EbNaut/04242231%20rawsym.bmp

 

Using some frequency shift in the decoder I got the peak almost centered

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/EbNaut/04242231%20shifted.bmp

 

But the decoder produced no message

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/EbNaut/04242231%20decoder.bmp

 

This peaks can only be seen in the files with FFT recoded at time slots xx:00 and xx:30

And even not in all the files but just five. The converted wav can be found here if there is interest in squizzing it

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/EbNaut/04242231.wav

 

There is also a problem with the time of the recordings. I'm not getting the records at the exact hour

and don't know how to configure it in SL. You can see that the file named 04242231 by SL is reported

by EbNaut as starting at 22:26 and suposed to contain a record of 10 minutes, so ending at 22:36

 

So it may contain just a fraction of Domenico's message, which started at 22:30 untill 22:40 aprox

Is that right ? How can I manage to get the FFT files recorded at the right time ?

 

73 de Luis

EA5DOM

 

PS: Yes Roelof. "free" VAC version here. And quite outdated, by the way ;-)

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De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de Domenico IZ7SLZ
Enviado el: lunes, 24 de abril de 2017 21:03
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: EbNaut on LF

EbNaut session is exended. Transmissions will continue until 08.00 UT of tomorrow April 25th.

73, Domenico IZ7SLZ

On 24 Apr 2017 13:16, "Domenico IZ7SLZ" <iz7slz.domenico@gmail.com> wrote:

PS:signal generated with Paul's program EbSynth.

73, Dom

On 24 Apr 2017 13:12, "Domenico IZ7SLZ" <iz7slz.domenico@gmail.com> wrote:

QRG 137495.000 Hz

At XX.00 and XX.30

18 characters

0.5 s/sym

8K19A CRC16

Duration 9 min 28 s

Until 22.00 UT of today.

Reports are welcome.

73, Domenico iz7slz