|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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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 
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:
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