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Re: LF: Ebnaut tonite from JN80

To: [email protected]
Subject: Re: LF: Ebnaut tonite from JN80
From: Domenico IZ7SLZ <[email protected]>
Date: Tue, 29 Jan 2019 19:20:03 +0100
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LF, EbNauters

Rob has sent his wave file coming from the Spectrum Lab EbNaut recorder

With the help of the linux programs vtwavex i have converted it in the vlfrx-tools native .vt file and i have attempted the decode.

Indeed the only possible decode is Riccardo's transmission of 2108-01-27_23:00 obtained with 0.4s of time offset

initial reference phase 58.9 amplitude 7.760e-02
phase   0    0    0    0    0
found rank 0 ber 3.8095e-01 Eb/N0 1.4 M -1.078971028e+00 ph 0 0,0,0,0 [73]
carrier phase: 2.3 deg
carrier Eb/N0: 3.2 dB
carrier Es/N0: -11.53 dB
carrier S/N: 13.73 dB in 496.0 uHz, -19.31 dB in 1Hz, -53.29 dB in 2.5kHz

Then I have investigated on failed decodes on my frequency slot at that hour.
Knowning the message 'IZ7SLZ' and using the signal analysis function of EbNaut I found (with +0.001 Hz of frequency offset):

carrier phase: -113.4
carrier Eb/N0: -7.2 dB
carrier S/N: 8.09 dB in 595.2 uHz, -24.16 dB in 1Hz, -58.14 dB in 2.5kHz

Maybe >6 dB  are necessary to pass my full callsign in 30 minute of transmission.

Thanks again Rob for the attempt.

73, Domenico IZ7SLZ

On Mon, 28 Jan 2019 at 15:09, Domenico IZ7SLZ <[email protected]> wrote:
that 'wave' file should be ok.

Paul Nicholson includes the program 'vtwavex' in his vlfrx-tools that can extract signals from a WAV file.


Domenico IZ7SLZ 


On 28 Jan 2019 15:00, "Rob Renoud" <[email protected]> wrote:

The single file that I saved for last night was the decimated FFT file (.wav file) using the Spectrum Lab Wave Recorder.  The file covers the entire RX session starting at 2059 UTC and runs until I stopped recording about 1030 UTC this morning (sample rate: 10.766602/sec, RX freq: 1000.000 Hz (137545.000 Hz RF center frequency), File Size: 3.77 MB).    

Will this file work for you?


On Jan 28, 2019, at 07:29, Domenico IZ7SLZ <[email protected]> wrote:

Thanks dear friends Jay and Rob for the your efforts on trying to decode my small signal.

Is it possible to have from you the Spectrum Lab raw files with the info needed to convert them (using DF6NM's program)  in 'wave' format (i.e. sample rate, FFT lenght, center frequency) or can you share the files already converted in 'wave' format ?
I would like to attempt a decode using vlfrx-tools: with diagnostic tools -f15 -f16 -M 'IZ7SLZ' i will look for the missing dB's.
Thanks in advance.
Domenico IZ7SLZ

On Mon, 28 Jan 2019 at 13:18, Rob Renoud <[email protected]> wrote:
Domenico and Riccardo,

Riccardo:  1 Decode at 2300 UTC
Rank 0; cEb/N0 3.2; Eb/N0 0.9; MSG 73, BER 38.7; Ref Phase 0,0,0,0

Domenico:  Sorry, no decodes.


On Jan 28, 2019, at 06:06, "[email protected]" <[email protected]> wrote:

Sorry to report no decodes ;~( .
Jay W1VD
----- Original Message -----
From: Domenico IZ7SLZ <[email protected]>
Reply-To: <[email protected]>
Sent: 1/27/2019 1:32:37 PM
Subject: Re: LF: Ebnaut tonite from JN80

Rob, Jay, LF

Another attempt tonight. Same parameters (6 char, 3 s/sym, crc16, 8K19A)
Qrq is 137545.2 Hz 
(The script is ok now!!)
Every hour from 21.00 utc 'til 07 utc of tomortow)

73, Domenico IZ7SLZ 

On 27 Jan 2019 15:25, "Rob Renoud" <[email protected]> wrote:

No decodes as you were outside of my receive range.


On Jan 27, 2019, at 05:27, Domenico IZ7SLZ <[email protected]> wrote:

my previous  transmission's announcement was wrong.

Since i have run an obsolete setup file, the transmissions succeeded but on 137540.0 Hz  (instead of 137545.2 Hz) with 6
char, 3 s, 8K19A, CRC16.
I hope that receiving attempts can be done anyway. Sorry for the trouble.

I will send now, via daytime propagation, an 'hope' message on 137540 Hz, 38 characters 0.5 s/sym 8K19A, CRC16
at 10:30, 11:30, 12:30, 13:30.

Finger crossed also for that situation !

73, Domenico IZ7SLZ

On Sun, 27 Jan 2019 at 00:24, Domenico IZ7SLZ <[email protected]> wrote:
Yes Markus, LF

Confirm: 6 characters.

Apologies for the clerical error and thanks Markus for the advice.

73, Dom IZ7SLZ

On Sat, 26 Jan 2019, 22:49 Markus Vester <[email protected] wrote:
Hi Domenico,

6 characters I would guess?

73, Markus

-----Ursprüngliche Mitteilung-----
Von: Domenico IZ7SLZ <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Sa, 26. Jan. 2019 19:55
Betreff: LF: Ebnaut tonite from JN80

LF, Ebnauteers

An attempt to pass my complete call sign with EbNaut on 137545.2 Hz.

5 char, 3 s, 8K19A, CRC16, duration 28', every hour from 21.00 UT to 08.00 UT of tomorrow.
73, Domenico IZ7SLZ

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