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RE: LF: 2200M EbNaut Beacon

To: "[email protected]" <[email protected]>
Subject: RE: LF: 2200M EbNaut Beacon
From: VIGILANT Luis Fernández <[email protected]>
Date: Tue, 2 Oct 2018 08:37:27 +0000
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Thread-topic: LF: 2200M EbNaut Beacon

Congratulations Domenico, EbNaut


I checked my Rx files this weekend but was unable to decode Rob’s message. Need more gain in this receiver


Would you please publish the current parameters your grabber is searching for decode ?

I think it would be interesting to keep a few set of different parameters, so we would easily test different messages

varying in length and frequency


It can be used as a kind of “EbNaut Repeater”. Two stations can transmit and get the decodes at your grabber

not bothering for the Rx part. Not a QSO indeed but a different experience and fun is guaranteed


As EbNaut Tx is the easy part of the game, your EbNaut Rx grabber makes it very easy start for beginners

An EbNaut grabber in central Europe will let many hams with small signals in LF to try EbNaut Tx and say “Hi” J


73 de Luis



De: [email protected] [mailto:[email protected]] En nombre de Domenico IZ7SLZ
Enviado el: martes, 02 de octubre de 2018 1:16
Para: [email protected]
Asunto: Re: LF: 2200M EbNaut Beacon


LF EbNauters,


thanks to Markus and Stefan for the comments and to Rob for putting on air a very good signal.

I was also surprised to see the decode achieved by the auto-decoder without any time and frequency offset !

Propagation conditions are becoming better, but noise here is still high.

I tried a deep investigation: no further decode,  but with an offset of -0.0001 Hz and +0.005s (ooops !) i have improved the 2018-09-30_03:00 UT decode:


initial reference phase -62.3 amplitude 2.049e-01
phase   0    0    0    0    0
carrier phase: -6.9 deg
carrier Eb/N0: 0.5 dB
carrier Es/N0: -10.10 dB
carrier S/N: 19.87 dB in 672.0 uHz, -11.86 dB in 1Hz, -45.84 dB in 2.5kHz
elapsed 58
found rank 43 ber 3.4980e-01 Eb/N0 -0.6 M -7.389708042e+00 ph 0 0,0,0,0 [K3RWR_FM18QI_73]



Looking on the October 1st recordings, with these offsets,  i got another decode at 02:30 UT:


initial reference phase -6.6 amplitude 2.356e-01
phase   0    0    0    0    0
carrier phase: -1.2 deg
carrier Eb/N0: 0.4 dB
carrier Es/N0: -10.23 dB
carrier S/N: 19.74 dB in 672.0 uHz, -11.99 dB in 1Hz, -45.97 dB in 2.5kHz
elapsed 58
found rank 84 ber 3.6694e-01 Eb/N0 -1.7 M -7.504411221e+00 ph 0 0,0,0,0 [K3RWR_FM18QI_73]


QRB  is about 7600 km.


Working conditions here, (vintage 😀) as usual:

- miniwhip (a modified ex-Navtex antenna from Furuno ; see attachment)

- receiver JRC NRD-92M with external 10 MHz reference signal steered by  GPS

- a modest PC (Intel P4 CPU 3.50GHz x2) from scrap with Ubuntu 14.04LTS

- software vlfrx-tool from Paul Nicholson.


I have attached also the latest version of  the bash './autoebnaut' i.e. the list of the commands that recall vlfrx-tool programs to start the decoder each 30 minutes.

Other linux programs are running in background:

- vtcard and vttime to manage and calibrate the audio card

- vtwrite to store audio coming from receiver

- gpsd and chrony to manage the nmea and 1pps from neo8 gps (connected at serial COM1) and adjusting the PC clock.



73, Domenico IZ7SLZ














On Mon, 1 Oct 2018 at 03:24, Markus Vester <[email protected]> wrote:

Just happened to see this on Domenico's auto-Decoder:

2018-09-30_03:00:00 137470.000Hz N=15 T=1.5s 8K19A CRC=16 list=1000 sym=992 Duration=1488.0s
found rank 29 ber 3.5081e-01 Eb/N0 -0.7 M -8.147493362e+00 ph 13 -150,-150,180,180 [K3RWR_FM18QI_73]
found rank 9 ber 3.5988e-01 Eb/N0 -1.3 M -8.275846004e+00 ph 49 -120,-150,-150,180 [K3RWR_FM18QI_73]

Cool, well done both!

73, Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Rob Renoud <[email protected]>
An: RSGG_LF <[email protected]>
Verschickt: Fr, 28. Sept 2018 15:49
Betreff: LF: 2200M EbNaut Beacon

Hello 2200 Meters EbNaut,

I will run the EbNaut beacon on 28, 29 and 30 September from 2300 UTC to 1100 UTC this coming weekend as follows:

Code: 8K19A
Symbol Period: 1.5 sec
CRC: 16
Number of Char: 15 (K3RWR_FM18QI_73)
Signal Bits: 992
Duration: 1488 sec (00:24:48.00)
Frequency: 137470.000 Hz
TX Sequence: 2 X per hour starting on minutes 00 and 30
Power: 1 Watt EIRP

Reports and comments welcome :-)

Rob - K3RWR
“Practicing the Art of Radio”

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