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Re: [gaia] Video about community network using HF band

Jane Coffin <coffin@isoc.org> Wed, 18 March 2020 15:21 UTC

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From: Jane Coffin <coffin@isoc.org>
To: Adam Burns <adamb@free2air.net>, "gaia@irtf.org" <gaia@irtf.org>
Thread-Topic: [gaia] Video about community network using HF band
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Date: Wed, 18 Mar 2020 15:20:51 +0000
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Subject: Re: [gaia] Video about community network using HF band
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@Adam – I was wondering what might kick-in now that we have these challenges in front of us.
I fully expect that it is time for me to study the short-wave course manuals sitting on my work-table 😉

From: gaia <gaia-bounces@irtf.org> on behalf of Adam Burns <adamb@free2air.net>
Date: Wednesday, March 18, 2020 at 6:13 AM
To: "gaia@irtf.org" <gaia@irtf.org>
Subject: Re: [gaia] Video about community network using HF band


In Berlin late last year, I demonstrated extremely low cost old-school AX.25 Packet Radio connectivity using the open source Direwolf (which effectively acts as a software modem and AX.25 terminal) and Baofeng HF transceivers.

A pair of nodes can cost as little as US$100.

Details on line soon, but contact me off-list if you need help or further information.

Regards,

Adam.


On 18/03/2020 10:41, Javier Simó wrote:

18 years ago we worked on a HF packet-radio based solution and developed improvements  using OFDM newQPSK; getting up to 9600 bits/s. I don't know whether I can find the expert who might resemble all the details, code, etc, but if you feel it could be interesting I can explore that.

Best

Javier


El 18/3/20 a las 4:31, Rafael Diniz escribió:

Gracias Luiz!



We carried initial tests of this system in Mexico. The raw throughput,

in reasonable propagation conditions, is from 500 up to 4k bit/s. In

"real world" tropical region NVIS trx with hundreds of kilometers of

distance, with packet protocol and ARQ layers in place, the net

throughput ranges from 50 to 500 bit/s, depending on many factors.



Abrazo,

Rafael





On 3/17/20 6:23 PM, Luis Martinez wrote:

Parabens Rafael !

It is wonderful, we are discussing a project like that in Mexico. Can

you share what is the speed you are able to achieve ?

Obrigado.

Luiz





On March 17, 2020 at 1:37:42 PM, Rafael Diniz (rafael@riseup.net<mailto:rafael@riseup.net>

<mailto:rafael@riseup.net><mailto:rafael@riseup.net>) wrote:



Hi all,



Here is the link of our latest developments about HERMES[1]:

https://vimeo.com/398331581



Cheers,

Rafael Diniz

Rhizomatica



[1] https://www.rhizomatica.org/hermes/



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[cid:part10.A476464D.9F1606EB@free2air.net]



Francisco Javier Simó Reigadas

Profesor, Director de la ETSIT

Dept. Teoría de la Señal y Comunic. y Sist. Telemáticos y Computación

Universidad Rey Juan Carlos

Campus de Fuenlabrada (Madrid), España

Teléfono: 91 488 81 67

javier.simo@urjc.es<mailto:javier.simo@urjc.es> | www.urjc.es<http://www.urjc.es> | @URJC |





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