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

Adam Burns <adamb@free2air.net> Thu, 19 March 2020 11:42 UTC

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To: Rafael Diniz <rafael@riseup.net>, gaia@irtf.org
References: <bf891b74-2c79-a17e-b78a-2a420cc1d158@riseup.net> <CAPOot9uWLawrpQagpKAhZYy5+Ld=edToMjK+KT3KP+3tbyWGUg@mail.gmail.com> <377af1c4-5750-3829-0d2d-74d41295b591@riseup.net> <9ee7f246-8122-1a94-28d4-696651eb7f74@urjc.es> <30d67bc3-ebc3-fe39-ba68-e4baa1363504@free2air.net> <0e196e43-8056-de7a-a84c-925eee1a1f48@riseup.net>
From: Adam Burns <adamb@free2air.net>
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Date: Thu, 19 Mar 2020 12:42:26 +0100
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Subject: Re: [gaia] Video about community network using HF band
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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 |
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> gaia mailing list
>>> gaia@irtf.org
>>> https://www.irtf.org/mailman/listinfo/gaia
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