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Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received

To: "[email protected]" <[email protected]>
Subject: Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received
From: VIGILANT Luis Fernández <[email protected]>
Date: Sat, 27 Oct 2018 08:46:36 +0000
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Thread-topic: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received
Hi EbNaut

Alaska is still too far away for me. Even in EbNaut :(
I'm struggling here with the antenna. Most of the time impedance rises and I hardly run 1A RF current
For long EbNaut transmissions the PA needs to work more relaxed and last night it was no more than 200mA

Domenico decoded my messages too. I tried a 30 characters message at 0.1s but didn´t work
Which are the EbNaut scripts you have configured now, Domenico ? Only for 6 characters at 3s/symbol ?
Can you run different srips at the same time to try different message lenghts and speeds ?

Rainy weekend here. Impedance drops a lot after rain. Let's see how much current can drain
Last time I could see almost 4A RF. But for short time untill a mosfet rised a white flag ;-)

73 de Luis

De: [email protected] [[email protected]] en nombre de Laurence KL7 L [[email protected]]
Enviado: sábado, 27 de octubre de 2018 0:19
Para: [email protected]
Asunto: Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received

Im trying to quieten down my 1pps into the sound card so it doesnt bleed over....getting there slowly!

Lauence KL7L

From: [email protected] <[email protected]> on behalf of Markus Vester <[email protected]>
Sent: Friday, October 26, 2018 1:51 PM
To: [email protected]
Subject: Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received
Another strong decode with zero symbol errors. This can go much further! I hope someone in DX-land is observing the frequency.

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: VIGILANT Luis Fernández <[email protected]>
An: [email protected] <[email protected]>
Verschickt: Do, 25. Okt 2018 12:36
Betreff: RE: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received

Hi Domenico, LF


I can test again tonight. No problem. I will transmit in “second” periods at minute 30


Finally made an small pcb with 4013 and 4070 in SMD. It plugs directly in the 4013 shocket. Uses just one row of the shocket

So it is a very easy way to get phase modulation in Class-D G0MRF style PA’s. Just plug and play. Attached is a picture of an ugly

wired version. A new pcb is already designed using just one side, no drills, and just one wire jumper. Easy to reproduce with

big SMD components (1206)


Schematic and picture attached


73 de Luis



De: [email protected] [mailto:[email protected]] En nombre de Domenico IZ7SLZ
Enviado el: miércoles, 24 de octubre de 2018 23:36
Para: [email protected]
Asunto: Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received


Hi Luis, Markus and all


i'm sorry Luis becouse i miss your recent EbNaut transmissions.

My Linux PC was engaged in SAQ reception. After dinner i have restored the setup and now receiver on 136.490 kHz and autodecoder are again operational so i hope that you are planning to transmit again further messages tonight.


Good reception of SAQ here in JN80nu thanks to very low QRN and to Paul's vlfrx-tools used for acquiring, filtering and stream the audio to Windows PC.  Then i have used Spectrum Lab to convert to analog and send the audio to the speaker. Path is about 2300 km.

This is the audio recordered:

In perfect 'vintage' marine radio officer style, i have prepared the text sent by SAQ :


a nice text about the Peace. Thanks to the SAQ staff for their activities.


73, Domenico IZ7SLZ









On Wed, 24 Oct 2018 at 22:43, VIGILANT Luis Fernández <[email protected]> wrote:

Thank you Markus ! :-)


A second message was transmited at odd (second) period. Your auto decoder is performing very good 


73 de Luis




El 24 oct. 2018 21:38, Markus Vester <[email protected]> escribió:

Luis, you've made it! 

An error-free decode at DF6NM, and also successful at DL0AO (with lower SNR, presumably due to the RX antenna pointing in another direction).

Best 73,
Markus (DF6NM)


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