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

Rafael Diniz <rafael@riseup.net> Thu, 19 March 2020 16:18 UTC

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To: Adam Burns <adamb@free2air.net>, gaia@irtf.org
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From: Rafael Diniz <rafael@riseup.net>
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Date: Thu, 19 Mar 2020 13:18:01 -0300
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Subject: Re: [gaia] Video about community network using HF band
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Hi Adam,

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

Rafael

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).
> 
> Adam.
> 
> On 18/03/2020 15:29, Rafael Diniz wrote:
>> 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 (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/
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> gaia mailing list
>>>>>>> gaia@irtf.org <mailto:gaia@irtf.org>
>>>>>>> https://www.irtf.org/mailman/listinfo/gaia
>>>>> _______________________________________________
>>>>> gaia mailing list
>>>>> gaia@irtf.org
>>>>> https://www.irtf.org/mailman/listinfo/gaia
>>>> -- 
>>>>
>>>>
>>>> *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
>>>>
>>>> javier.simo@urjc.es <mailto:javier.simo@urjc.es>| www.urjc.es
>>>> <http://www.urjc.es>| @URJC |
>>>>
>>>>
>>>>
>>>>
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