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

[Rafael Diniz <[e-mail]>]

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

Rafael

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
> 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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