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

Luis Martinez <> Sun, 22 March 2020 05:56 UTC

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From: Luis Martinez <>
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Date: Sat, 21 Mar 2020 22:55:50 -0700
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Subject: Re: [gaia] Video about community network using HF band
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Indeed a great theme. We have designed these week a network for some poor
communities that need to be connected for having online courses, all the
schools are closed here.

On March 21, 2020 at 12:37:22 PM, Leandro Navarro (

Dear all,

Sounds like a good topic for GAIA in collecting cases and references for a
document about essential infrastructures, emergency communications,
reliable and affordable communications (there are, but perhaps we can
collect, update, extend, etc).
More important these days when we find out COVID has made the internet a
critical infrastructure. Shall we use the next GAIA meeting to discuss
about recent “game changer” experiences and reflect about lessons for the
future, and what useful outcomes GAIA could develop?

SAX, Leandro.
P.S: SAX is a typical sign-off acronmy in and Catalan to desire
the best: Salut=Health, Amor=Love, Xarxa=Network.

On 19 Mar 2020, at 17:18, Rafael Diniz <> wrote:

Hi Adam,

We kind of standardized with the use of at least 100W radios, which is
what works well in our context.


On 3/19/20 8:42 AM, Adam Burns wrote:

Hi Rafael,

It's not restricted to one brand and there are a range of cheap models,
with some around 8W, but the upper limit is your wallet (apart from
licensing, etc).


On 18/03/2020 15:29, Rafael Diniz wrote:

Hi Adam. Which power can these Baofeng HF trx output?


On 3/18/20 7:12 AM, Adam Burns wrote:

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

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.



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.



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.


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 ?

On March 17, 2020 at 1:37:42 PM, Rafael Diniz (
< <>>) wrote:

Hi all,

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

Rafael Diniz


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*Francisco Javier Simó Reigadas*

*Profesor, Director de la ETSIT*

*Dep**t. Teoría de la Señal y Comunic. y Sist. Telemáticos y Computación*

Universidad Rey Juan Carlos

Campus de Fuenlabrada(Madrid), España

Teléfono: 91 4888167 < <>>|
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Leandro Navarro

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