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Boa tarde colega<BR> <BR>Já construi e operei uma antena destas com resultados muito razoáveis nos 18 e 14MHz, por vezes bons nos 21, 24 e 28 MHz. <BR>Muito simples de construir, tenho um artigo mais detalhado no meu blog:<BR><br> <a href="http://filipect1ddw.blogspot.pt/">http://filipect1ddw.blogspot.pt/</a><BR> <BR>Há várias variações técnicas de construção mas a que mais me convençe é a do colega alemão cujo esquema está no artigo do meu blogue.<BR>Boa construção e Boas Festas.<BR> <BR>CT1DDW - Filipe Ferreira<BR><div><div id="SkyDrivePlaceholder"></div><hr id="stopSpelling">Date: Thu, 20 Dec 2012 12:31:23 +0100<br>From: ct1ilt@gmail.com<br>To: ct-comunicacoes-e-tecnologias@googlegroups.com<br>CC: cluster@radio-amador.net<br>Subject: ARLA/CLUSTER: Re: [CT-Com. & Tec.] HF multiband beam "MARÍA MALUCA"<br><br><font color="#000000"><font face="georgia,serif">Já alguem testou esta antena ?<br><br>F. Lopes CT1ILT<br><br><br></font></font><br><div class="ecxgmail_quote">
2012/12/19 Carlos Fonseca - CT1GFQ <span dir="ltr"><<a href="mailto:ct1gfqgrupos@gmail.com">ct1gfqgrupos@gmail.com</a>></span><br><blockquote style="padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;" class="ecxgmail_quote">
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<div style='font-family: "Calibri"; font-size: 12pt;'>
<p align="center"><i><font color="#008000" size="5" face="Arial Black">HF multiband beam
"MARÍA MALUCA"</font></i></p>
<p align="center"><i><b><font face="Times New Roman"><font style="font-size: 13.6pt;">Published as an article on URE's magazine
"Radioaficionados" on January 2009</font></font></b></i></p>
<font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> <BR>
<p align="justify"><font face="Courier New"><font style="font-size: 13.6pt;"> Invented by</font><span><font style="font-size: 13.6pt;"> </font></span><span>José
Salvador Luiz Victor Marinaro (PY2BBP) in 1957, this antenna is more than a
dipole, it is a dipole with a passive element which works as a director or
reflector element so there is a directional gain. Works from 20 to 6 meter
bands. In 12, 10 and 6 meter the passive element works as reflector instead of
director, then a 180º rotation is needed to work the same
direction.</span></font></p>
<font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> <BR>
<p align="center"><font face="Times New Roman"><font style="font-size: 13.6pt;"> <span> </span><img border="0" src="https://gfx5.hotmail.com/mail/w4/pr04/ltr/i_safe.gif" width="618" height="235"> </font></font></p>
<p align="justify"><font face="Courier"><font style="font-size: 13.6pt;">
</font></font></p>
<p align="justify"><font face="Courier"><font style="font-size: 13.6pt;"> To build the elements can be used
aluminium pipes of several diameters, linked and fixed by screws, to get the
needed lengths. The dipole stands its two parts by a pvc pipe and a methacrylate
plate.</font></font></p>
<font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> <BR>
<blockquote>
<font face="Times New Roman"><font style="font-size: 13.6pt;">
<span> </span><img border="0" src="https://gfx5.hotmail.com/mail/w4/pr04/ltr/i_safe.gif" width="311" height="234">
</font><span><font style="font-size: 13.6pt;"> </font></span></font><img border="0" src="https://gfx5.hotmail.com/mail/w4/pr04/ltr/i_safe.gif" width="313" height="234"><BR></blockquote>
<font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> <BR>
<p align="justify"><font face="Courier New"><font style="font-size: 13.6pt;"> To feed this antenna a</font><span><font style="font-size: 13.6pt;"> </font></span><span>450Ω
ladder line</span><span><font style="font-size: 13.6pt;"> </font></span><font style="font-size: 13.6pt;">is
needed</font><span><span> </span>and antenna tuner too. Also a BALUN is
needed which can be 1:1 or 4:1. Mine is a 1:1 current BALUN wound on a FT-240-43
core (12 bifilar turns).</span></font></p>
<font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> <BR>
<blockquote>
<font face="Times New Roman"><font style="font-size: 13.6pt;">
</font><span><font style="font-size: 13.6pt;"> </font></span></font><img border="0" src="https://gfx5.hotmail.com/mail/w4/pr04/ltr/i_safe.gif" width="319" height="236"><BR></blockquote>
<font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> <BR>
<p align="justify"><font face="Courier"><font style="font-size: 13.6pt;"> Ladder line length is important
because according to the length you cut it and frequency, impedance values can
be so high than the tuner cannot match. Minimum length is about 13.7 meters.
Then I added a RG-213 to reach my radio room. This length must be also adjusted
to be matched by the tuner with SWR 1:1. The following diagram shows the
instalation.</font></font></p>
<p align="justify"><font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> </p>
<blockquote>
<blockquote>
<p align="center"><img border="0" src="https://gfx5.hotmail.com/mail/w4/pr04/ltr/i_safe.gif" width="678" height="164"></p></blockquote></blockquote>
<p align="justify"><font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> </p>
<p align="justify"><font face="Courier New"><font style="font-size: 13.6pt;"> The ladder line must be insulated
from metalic objects about 15 to 20 cm. Can be replaced by two parallel
RG-62</font><span><font style="font-size: 13.6pt;"> </font></span><span>(93Ω)<span> </span></span><font style="font-size: 13.6pt;">coaxial cables, then feed line will be 186</font><span>Ω.</span><font style="font-size: 13.6pt;">
</font></font></p>
<p align="justify"><font face="Courier"><font style="font-size: 13.6pt;">
</font></font></p>
<p align="center"><img border="0" src="https://gfx5.hotmail.com/mail/w4/pr04/ltr/i_safe.gif" width="412" height="306"></p>
<blockquote>
<blockquote>
<blockquote>
<p class="ecxMsoNormal" align="left"><font face="Times New Roman"><font style="font-size: 13.6pt;">
</font></font></p></blockquote></blockquote></blockquote>
<p class="ecxMsoNormal" align="left"><font face="Courier"><font style="font-size: 13.6pt;"> Map shows contacts I made when
testing the antenna "Maria Maluca". In black color are 20 meter band QSOs, blue
are on 17m. and red are on 15m. Mode was BPSK31 in all contacts, power 30-40W.
The 80% of QSOs reported RST 599.</font></font></p>
<p class="ecxMsoNormal" align="center"><font face="Times New Roman"><font style="font-size: 13.6pt;">
</font></font></p>
<blockquote>
<blockquote>
<blockquote>
<p align="center"><img border="0" src="https://gfx5.hotmail.com/mail/w4/pr04/ltr/i_safe.gif" width="457" height="325"></p></blockquote></blockquote></blockquote>
<p class="ecxMsoNormal" align="left"><font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> </p>
<p class="ecxMsoNormal" align="left"><font face="Times New Roman"><font style="font-size: 13.6pt;"></font></font> </p>
<p class="ecxMsoNormal" align="left"><b><span><font face="Courier New"><font style="font-size: 13.6pt;">Technical
data:</font></font></span></b></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Bands:
20, 17, 15, 12, 10 y 6 meter</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Gain:
7.26 - 2.25dBi</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Front/Back relation
(F/B): 6.63 - 0.48dB</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Bandwidth @ SWR
2:1: 20m.:
135kHz</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;"> 17m.:
>100kHz</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;"> 15m.:
260kHz</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;"> 12m.:
>100kHz</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;"> 10m.:
390kHz</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Max
power:
1000W</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Boom
length:
1.46 m.</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Longest
element:
7.56 m.</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Turning
radius:
3.9 m.</font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Windload:
0.2 m² </font></font></span></p>
<p class="ecxMsoNormal" align="left"><span><font face="Courier New"><font style="font-size: 13.6pt;">Weight:
3.6 kg</font></font></span></p>
<div style='font-family: "Calibri"; font-size: 12pt;'> </div>
<div style='font-family: "Calibri"; font-size: 12pt;'><a title="http://perso.orange.es/isaac.dg/antena%20maria%20maluca.htm" href="http://perso.orange.es/isaac.dg/antena%20maria%20maluca.htm" target="_blank">http://perso.orange.es/isaac.dg/antena%20maria%20maluca.htm</a></div>
<div style='font-family: "Calibri"; font-size: 12pt;'> </div>
<div style='font-family: "Calibri"; font-size: 12pt;'>73's de
Carlos CT1GFQ<br>SKCC#466<br>REP#1406</div></div></div></div><span class="ecxHOEnZb"><font color="#888888">
<BR>
-- <br>
Para mais informações/opções visite o site, e edite a sua conta:<br>
<a href="http://groups.google.com/group/ct-comunicacoes-e-tecnologias?hl=en?hl=pt-PT" target="_blank">http://groups.google.com/group/ct-comunicacoes-e-tecnologias?hl=en?hl=pt-PT</a><br>
</font></span></blockquote></div><br><br clear="all"><br>-- <br><font style="color: rgb(0, 0, 0); font-family: georgia,serif;">Regards,<br>Filipe Lopes <br>CT1ILT aka CR6K</font><br style="color: rgb(0, 0, 0); font-family: georgia,serif;">
<br><br>
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