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Bom dia,<br><br>Resolvi o exame com alguma calma e cheguei a uma 
resolução muito semelhante à do Pedro Ribeiro excepto nos seguintes 
pontos a azul:<br><br>Questão Proposta<br>1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br><font style="" color="#0070C0">2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4</font>
 -&gt; Advinho que quem formulou a pergunta tenha em mente o seguinte: 
MUF - É a frequência máxima na qual um sinal transmitido para sinal a 
90º é devolvido à Terra. A maior probabilidade de sucesso (não diz a 
distância das duas estações nem mais nada) é com a frequência disponível
 mais baixa. <br>3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4<br>4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br><font style="" color="#0070C0">5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4</font> -&gt; Recomendação T/R 61-01 Anexo 1 ponto 2.3 que remete para o Anexo 2 tabela 1<br>6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d<br>7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br><font style="" color="#0070C0">8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3</font>
 -&gt; O IMD é causado pelo comportamento não linear dos dispositivos de
 saída do transmissor. Temos o exemplo do modo PSK31 quando saímos da 
linearidade (activamos o circuito de ALC do rádio) já estamos a aumentar
 o IMD. Relacionado com a pergunta 10 também.<br>9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br><font style="" color="#0070C0">10&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1 ou 3 ?</font>
 -&gt; A resposta 1 também é verdade pois o andar de saída satura mais 
cedo para um determinado nível de entrada constante e uma corrente de 
colector mais baixa. Todavia no meu entendimento a causa mais comum é um
 sinal de entrada no PA elevado que provoca que o andar de saída saia da
 zona de trabalho linear. Por isso eu responderia a opção 3<br>11&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br>12&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>13&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>14&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>15&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c<br>16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; a<br>17&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; a<br>18&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>19&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>20&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>21&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>22&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>23&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>24&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br>25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>26&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>27&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>28&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>29&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>30&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>31&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>32&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>33&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br>34&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>35&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4<br>36&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>37&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br>38&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4<br>39&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br><font style="" color="#0070C0">40&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2 ou 4 ?</font>
 -&gt; Provavelmente a resposta certa será a 2, pois a frase "frequência
 muito superior" não é correcto, basta o dobro da frequência máxima que 
está a ser amostrada.<br><br>Se estiver errado alguém pode por favor 
clarificar? É que estou a estudar para o exame de categoria 1 e qualquer
 ajuda é bem-vinda.<br><br><br>73<br>
&nbsp;<br>
Pedro CT2GET<br><br><br><div><hr id="stopSpelling">Date: Thu, 10 Nov 2011 00:07:34 +0000<br>From: cr7abp@gmail.com<br>To: cluster@radio-amador.net<br>Subject: Re: ARLA/CLUSTER: Exame de Amador para a categoria 1<br><br>
  
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    Aqui vai a minha solução "rápida", não garanto a exactidão das
    respostas, alguns são assuntos que não domino de todo e não tenho
    muito tempo para ir confirmar.<br>
    Em bastantes questões e tal como o Renato já tinha evidenciado em
    relação à questão 13, considero pouco clara a questão ou mal
    definida a começar logo pela primeira questão em que não é
    mencionado qualquer ângulo de incidência do sinal na ionosfera e
    este terá um factor decisivo na reflexão ou no escape do sinal para
    o espaço. Diria que genéricamente, entre a frequencia crítica foF2 e
    a MUF, para que o sinal seja reflectido terá de ter quanto maior a
    frequência mais baixo o ângulo de incidência na ionosfera.<br>
    Neste casos, tentei deduzir que solução devia pretender o inventor
    da pergunta ...<br>
    <br>
    <table style="border-collapse:collapse;width:96pt" width="128" border="0" cellpadding="0" cellspacing="0">
      <colgroup><col style="width:48pt" width="64" span="2"> </colgroup><tbody>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt;width:48pt" width="64" height="20">Questão</td>
          <td style="width:48pt" width="64">Proposta<br>
          </td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">1</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">2</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">3</td>
          <td align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">4</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">5</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">6</td>
          <td>d</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">7</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">8</td>
          <td>4?</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">9</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">10</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">11</td>
          <td align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">12</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">13</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">14</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">15</td>
          <td>c</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">16</td>
          <td>a</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">17</td>
          <td>a</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">18</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">19</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">20</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">21</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">22</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">23</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">24</td>
          <td align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">25</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">26</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">27</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">28</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">29</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">30</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">31</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">32</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">33</td>
          <td align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">34</td>
          <td align="right">1</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">35</td>
          <td align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">36</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">37</td>
          <td align="right">3</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">38</td>
          <td align="right">4</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">39</td>
          <td align="right">2</td>
        </tr>
        <tr style="height:15.0pt" height="20">
          <td style="height:15.0pt" align="right" height="20">40</td>
          <td align="right">2</td>
        </tr>
      </tbody>
    </table>
    <br>
    Aceitam-se e agradecem-se correcções em relação à solução que
    proponho.<br>
    O tempo agora anda muito apertado mas quando folgar (ou precisar de
    me preparar para exame daqui a ano e meio) vou incluir as questões
    na minha compilação e ir buscar fundamentação para as soluções.<br>
    <br>
    73!<br>
    <br>
    On 08-11-2011 14:16, João Gonçalves Costa wrote:
    <blockquote cite="mid:5C4C49AFB7040B42B32EB395C8F7887F3A6FE7DA45@EXH100.w2k.ctt.pt">
      
      
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              <td style="width:216.6pt;padding:.75pt .75pt .75pt\00000d\00000a                .75pt;height:7.8pt" width="361">
                <p class="ecxMsoNormal" style=""><b><span style="font-size:15.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#F3CA09">Exames
                      da ANACOM</span></b><b><span style="font-size:13.5pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#F3CA09">
                    </span></b><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"></span></p>
              </td>
              <td style="width:11.4pt;padding:.75pt .75pt .75pt\00000d\00000a                .75pt;height:7.8pt" width="19"><br>
              </td>
              <td style="width:90.6pt;padding:.75pt .75pt .75pt\00000d\00000a                .75pt;height:7.8pt" width="151"><br>
              </td>
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        <p class="ecxMsoNormal" style=""><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><br>
            O exame apresentado é o Exame de Amador de Radiocomunicações
            para a categoria 1 que nos chegou através de um nosso
            colega. Apenas está disponível neste momento as questões mas
            em breve será colocada uma resolução com todos os
            fundamentos teóricos. </span></p>
        <p class="ecxMsoNormal" style=""><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;">Agradecemos
            a todos os colegas que tenham exames o favor de nos enviarem
            para <a href="mailto:geral@radioamadores.net"><span style="color:blue">geral@radioamadores.net</span></a> a
            fim de efectuarmos a sua divulgação.<br>
            &nbsp;</span></p>
        <p class="ecxMsoNormal" style=""><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;">Na
            nossa secção de exames encontram-se também disponíveis
            exames para as antigas categorias de radioamador.</span></p>
        <p class="ecxMsoNormal" style=""><b><span style="font-family:&quot;Arial&quot;,&quot;sans-serif&quot;">&nbsp;</span></b></p>
        <p class="ecxMsoNormal" style=""><b><span style="font-family:&quot;Arial&quot;,&quot;sans-serif&quot;">&nbsp;</span></b></p>
        <p class="ecxMsoNormal" style=""><b><span style="font-family:&quot;Arial&quot;,&quot;sans-serif&quot;">Categoria
              1</span></b><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"></span></p>
        <p class="ecxMsoNormal">&nbsp;</p>
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                <p class="ecxMsoNormal"><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><img id="ecxImagem_x0020_1" src="cid:part1.07060907.06040206@gmail.com" alt="Descrição:
                      http://www.radioamadores.net/logos/visto.gif" width="19" border="0" height="18"></span><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"></span></p>
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                <p class="ecxMsoNormal"><span style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"><a href="http://www.radioamadores.net/exames/categoria1ex1.pdf" target="_blank">Exame de Amador de
                      Radiocomunicações</a>
                    (<a class="ecxmoz-txt-link-freetext" href="http://www.radioamadores.net/exames/categoria1ex1.pdf" target="_blank">http://www.radioamadores.net/exames/categoria1ex1.pdf</a>)</span></p>
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        <p class="ecxMsoNormal">&nbsp;</p>
        <p class="ecxMsoNormal">&nbsp;</p>
        <p class="ecxMsoNormal">Fonte: <a href="http://www.radioamadores.net" target="_blank">http://www.radioamadores.net</a></p>
        <p class="ecxMsoNormal">&nbsp;</p>
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      <br>
      <pre>_______________________________________________
CLUSTER mailing list
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</pre>
    </blockquote>
    <br>
    <br>
    <pre class="ecxmoz-signature">-- 
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QRA: Pedro Ribeiro // Callsign: CR7ABP // GRID Locator: IM58mr
QTH: São Francisco, Alcochete, Portugal
Homepage: <a class="ecxmoz-txt-link-freetext" href="http://www.qrz.com/db/CR7ABP" target="_blank">http://www.qrz.com/db/CR7ABP</a>
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# HAM operation very limited by class 3 rules until April 2012  #
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<br>_______________________________________________
CLUSTER mailing list
CLUSTER@radio-amador.net
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