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

[Adam Burns <[e-mail]>]

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 ([e-mail]
>>> <mailto:[e-mail]>) 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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> -- 
>
>
> *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
>
> [e-mail] <mailto:[e-mail]>| www.urjc.es
> <http://www.urjc.es>| @URJC |
>
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