Boas Pedro.<br><br>Esse ponto é fulcral. É preciso não esquecer que o kernel do linux, por ser monolítico, tem lá uns locks implementados que o tornam péssimo para aplicações realtime, e muito bom para servidores de rede. Infelizmente, esse é o tipo de kernel que vem pre-compilado nas distribuições actuais.<br>
Para &quot;sacar&quot; o melhor partido do linux, é preciso recompilar o kernel com opções mais dirigidas ao realtime. Algo que já é distante para muitos...<br><br>73, Renato<br><br><div class="gmail_quote">No dia 10 de Junho de 2012 18:38, Pedro Ribeiro <span dir="ltr">&lt;<a href="mailto:ct7abp@gmail.com" target="_blank">ct7abp@gmail.com</a>&gt;</span> escreveu:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p>A quantidade de APIs envolvidas num sistema windows, o nível de generalização das mesmas e a baixa eficiência tornam o conjunto tipicamente mais rápido em linux, no entanto o processamento realtime no linux tem frequentemente problemas, tal como o ambiente gráfico, pouco eficiente e pouco consistente...</p>
<div class="im">

<p>73!<br></p>
<p>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=<br>
Note: Sent from mobile device with writing limitations.<br>
Nota: Enviado de um dispositivo móvel com limitações de escrita.<br>
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=<br>
QRA: Pedro Ribeiro // GRID Locator: IM58mr<br>
QTH: São Francisco, Alcochete, Portugal<br>
Homepage: <a href="http://www.qrz.com/db/CS7ABP" target="_blank">http://www.qrz.com/db/CS7ABP</a> <br>
=-=-=-=-=-=-=-= -=-=-=-=-=-=-=-=</p>
</div><div class="gmail_quote">No dia 10 de Jun de 2012 15:20, &quot;Renato Encarnação&quot; &lt;<a href="mailto:ct7abr@gmail.com" target="_blank">ct7abr@gmail.com</a>&gt; escreveu:<div><div class="h5"><br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

  
    
  
  <div bgcolor="#FFFFFF" text="#000000">
    Boas.<br>
    <br>
    O processamento necessário para os SDR&#39;s usb em windows ou em linux
    nem é maior nem menor, é igual.<br>
    <br>
    73, Renato<br>
    <br>
    On 09-06-2012 02:40, Paulo Mendes wrote:
    <blockquote type="cite">A ideia é boa, mas o processamento necessário para os
      SDR´s usb (RTL2832U) é elevado (pelo menos em Windows), em Linux
      deverá ser muito mais baixo no entanto nada como testar.
      <div><br>
      </div>
      <div>73´s</div>
      <div>Bom fim de semana.</div>
      <div><br>
      </div>
      <div>Paulo Mendes - CT2HQT</div>
      <div><br>
      </div>
      <div><br>
        <br>
        <div class="gmail_quote">No dia 8 de Junho de 2012 14:54, João
          Gonçalves Costa <span dir="ltr">&lt;<a href="mailto:joao.a.costa@ctt.pt" target="_blank">joao.a.costa@ctt.pt</a>&gt;</span>
          escreveu:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div link="blue" vlink="purple" lang="PT">
              <div>
                <p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">Definitivamente
                    estás, ou melhor, estamos rendido às Novas
                    Tecnologias.</span></p>
                <p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d"> </span></p>
                <p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d"> </span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d">                         
                    _\\|//_</span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d">                          
                    ( o o )</span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d">
                    ------------------ooO-(_)-Ooo------------</span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d">                     
                    73 de:</span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d"> 
                    ************************************</span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d"> 
                    *  CT1FBF / João Gonçalves Costa    </span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d">  * 
                    QTH Locator : IM58kq                 </span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d">  </span><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d" lang="EN-US">*  CQ Zone: 14  /  ITU Zone: 37      </span></p>


                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d" lang="EN-US">  *  E-mail and Address, see in: </span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d" lang="EN-US">  </span><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d">* 
                    <a href="http://www.qrz.com" target="_blank">www.qrz.com</a>              </span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d">  * 
                    QSL Card via Eqsl: <a href="http://www.eqsl.cc" target="_blank">www.eqsl.cc</a>                   
                  </span></p>
                <p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:#1f497d">  **************************************</span></p>
                <p class="MsoNormal"><span> </span></p>
                <p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d"> </span></p>
                <p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d"> </span></p>
                <p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d"> </span></p>
                <p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d"> </span></p>
                <p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">De:</span></b><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">
                    <a href="mailto:cluster-bounces@radio-amador.net" target="_blank">cluster-bounces@radio-amador.net</a>
                    [mailto:<a href="mailto:cluster-bounces@radio-amador.net" target="_blank">cluster-bounces@radio-amador.net</a>]
                    <b>Em nome de </b>Carlos Mourato<br>
                    <b>Enviada:</b> sexta-feira, 8 de Junho de 2012
                    14:25<br>
                    <b>Para:</b> Resumo Noticioso ARLA/CLUSTER<br>
                    <b>Assunto:</b> Re: ARLA/CLUSTER: Usar 1 computador
                    de 25 Dolares no Serviço de Amador</span></p>
                <div>
                  <div>
                    <p class="MsoNormal"> </p>
                    <p class="MsoNormal">Eu já me registei.  Acredito
                      que esta unidade de computação vai ter um enorme
                      leque de aplicações, começando pelo nosso hobby,
                      onde prevejo que venha a entar em todas as
                      frentes. É realmente interessante o grau de
                      miniaturização da unidade e o preço.</p>
                    <div>
                      <p class="MsoNormal">As vendas estão de novo
                        suspensas, porque assim que apareceram no
                        mercado  as mais de 200.000 unidades
                        construidas esgotaram-se no instante, vendendo
                        apenas uma unidade por cliente com pedido de
                        reserva.</p>
                    </div>
                    <div>
                      <p class="MsoNormal">Já pensaram num SDR com uma
                        &quot;coisita&quot; destas lá dentro?...Um gajo pega num
                        SDR, coloca lá uma unidade destas...Um TFT
                        desses das molduras no painel, umas teclas com
                        atalhos tambem no painel e mais uns encoders
                        para mudar a frequencia, e temos um super
                        transceiver home made e topo de gama!!</p>
                    </div>
                    <div>
                      <div>
                        <p class="MsoNormal"> </p>
                      </div>
                      <div>
                        <p class="MsoNormal"> </p>
                      </div>
                      <div>
                        <p class="MsoNormal"> </p>
                      </div>
                      <p class="MsoNormal"><b>Best 73 from: regards
                          from: CT4RK Carlos Mourato - Sines - Portugal</b><br>
                        <br>
                         <b><span style="color:red">Warning</span></b></p>
                      <div>
                        <p class="MsoNormal"><b><span style="color:red">Save
                              the Radio Spectrum! Eliminate Broadband
                              over Power Line. </span></b></p>
                      </div>
                      <div>
                        <p class="MsoNormal"> </p>
                      </div>
                      <div>
                        <p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:red">Salve o espectro
                              electromagnético!. Não use a rede
                              electrica para transmitir dados. Os
                              &quot;homeplugs power line&quot; e a tecnologia
                              &quot;power line&quot; causa fortes interferencias
                              noutro serviços sem voce se aperceber.
                              Diga não à tecnologia power line. Proteja
                              o ambiente electromagnético. Utilize
                              tecnologia de redes sem fio, denominadas
                              wireless.</span></b><br>
                          -----------------------------------------------------------
                        </p>
                      </div>
                      <p class="MsoNormal" style="margin-bottom:12.0pt"><br>
                        <br>
                      </p>
                      <div>
                        <p class="MsoNormal">2012/6/8 João Gonçalves
                          Costa &lt;<a href="mailto:joao.a.costa@ctt.pt" target="_blank">joao.a.costa@ctt.pt</a>&gt;</p>
                        <div>
                          <div>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">Raspberry Pi* used for
                                Amateur Radio</span></p>
                            <p><span style="font-size:11.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">Informações
                                sobre o computador Linux de baixo custo
                                (~15 UKP ou 25USD) da Fundação Raspberry
                                Pi para o ensino de programação de
                                computadores para as crianças. A
                                Fundação Raspberry Pi é uma instituição
                                de caridade registrada no Reino Unido
                                (Número de Registro 1129409), que existe
                                para promover o estudo da ciência da
                                computação e assuntos relacionados,
                                especialmente ao nível escolar, e trazer
                                de volta o aprendizado de computação
                                como diversão. Esperamos que esse
                                computador tenha muitas outras
                                aplicações, tanto no mundo desenvolvido
                                quanto no mundo em desenvolvimento. </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">AMSAT-UK and AMSAT-NA
                                member Dave Johnson, G4DPZ, has been
                                using the Raspberry Pi to run amateur
                                radio satellite software.</span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">The £22 Model B Raspberry
                                Pi is a credit-card sized ARM-based
                                computer board that plugs into a TV and
                                a keyboard. </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">Based around the 700 MHz
                                ARM11 processor the board has 256 MB
                                SDRAM, two USB ports, Ethernet with
                                composite and HDMI video outputs.
                                Low-level peripherals are GPIO pins,
                                SPI, I²C, I²S and UART.</span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">It was developed in
                                Cambridgeshire by a UK registered
                                charity, the Raspberry Pi Foundation,
                                which exists to promote the study of
                                computer science and related topics,
                                especially at school level, and to put
                                the fun back into learning computing.</span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">Dave&#39;s Raspberry Pi runs
                                Debian Squeeze with Xwindows and is
                                accessed using VNC over his shack
                                network.</span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">The first amateur radio
                                application he got running was GPredict
                                (thanks go to Alex Csete OZ9AEC for
                                making such a portable implementation).
                                Updates of Keplerian Two Line Elements
                                (KEP / TLE) from the Internet worked
                                perfectly.</span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">GPredict free real-time
                                satellite tracking and orbit prediction</span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"><a href="http://gpredict.oz9aec.net/" target="_blank">http://gpredict.oz9aec.net/</a></span></p>


                            <p class="MsoNormal">
                              <span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">Raspberry Pi computer now
                                on sale</span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"><a href="http://www.southgatearc.org/news/march2012/raspberry_pi_computer_now_on_sale.htm" target="_blank">http://www.southgatearc.org/news/march2012/raspberry_pi_computer_now_on_sale.htm</a>
                              </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US">AMSAT-UK</span></p>
                            <p class="MsoNormal"><span style="font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang="EN-US"><a href="http://www.uk.amsat.org/" target="_blank">http://www.uk.amsat.org/</a></span></p>


                            <p class="MsoNormal">
                              <span lang="EN-US"> </span></p>
                            <p class="MsoNormal"><span lang="EN-US"> </span></p>
                          </div>
                        </div>
                        <p class="MsoNormal" style="margin-bottom:12.0pt"><br>
_______________________________________________<br>
                          CLUSTER mailing list<br>
                          <a href="mailto:CLUSTER@radio-amador.net" target="_blank">CLUSTER@radio-amador.net</a><br>
                          <a href="http://radio-amador.net/cgi-bin/mailman/listinfo/cluster" target="_blank">http://radio-amador.net/cgi-bin/mailman/listinfo/cluster</a></p>
                      </div>
                      <p class="MsoNormal"> </p>
                    </div>
                  </div>
                </div>
              </div>
            </div>
            <br>
            _______________________________________________<br>
            CLUSTER mailing list<br>
            <a href="mailto:CLUSTER@radio-amador.net" target="_blank">CLUSTER@radio-amador.net</a><br>
            <a href="http://radio-amador.net/cgi-bin/mailman/listinfo/cluster" target="_blank">http://radio-amador.net/cgi-bin/mailman/listinfo/cluster</a><br>
            <br>
          </blockquote>
        </div>
        <br>
        <br clear="all">
        <div><br>
        </div>
        -- <br>
        <div>Com os melhores cumprimentos.</div>
        Paulo Mendes - CT2HQT<br>
      </div>
      <br>
      <fieldset></fieldset>
      <br>
      <pre>_______________________________________________
CLUSTER mailing list
<a href="mailto:CLUSTER@radio-amador.net" target="_blank">CLUSTER@radio-amador.net</a>
<a href="http://radio-amador.net/cgi-bin/mailman/listinfo/cluster" target="_blank">http://radio-amador.net/cgi-bin/mailman/listinfo/cluster</a>
</pre>
    </blockquote>
    <br>
  </div>

<br>_______________________________________________<br>
CLUSTER mailing list<br>
<a href="mailto:CLUSTER@radio-amador.net" target="_blank">CLUSTER@radio-amador.net</a><br>
<a href="http://radio-amador.net/cgi-bin/mailman/listinfo/cluster" target="_blank">http://radio-amador.net/cgi-bin/mailman/listinfo/cluster</a><br>
<br></blockquote></div></div></div>
<br>_______________________________________________<br>
CLUSTER mailing list<br>
<a href="mailto:CLUSTER@radio-amador.net">CLUSTER@radio-amador.net</a><br>
<a href="http://radio-amador.net/cgi-bin/mailman/listinfo/cluster" target="_blank">http://radio-amador.net/cgi-bin/mailman/listinfo/cluster</a><br>
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