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Olá Gomes.<div>A LFA : loop feed array não é uma moxon, mas sim um loop, rectângulo fechado.</div><div>Este sistema é muito interessante, pois apresenta uma isenção de lóbulos laterais quase nula</div><div>o que permite que a antena tenha uma temperatura de ruído Kº extremamente baixa.</div><div>Este loop saiu ainda com bonus, pois além das vantagens do ruido, melhor sustentabilidade mecânica, permite que seja</div><div>alimentada de duas maneiras.</div><div>Uma a antena fica com o ganho máximo, mas com perda de largura de banda.</div><div>Outra é o oposto, sacrificando um pouco do ganho, a antena permite cobertura de mais banda.</div><div>Isto sempre garantindo uma impedância de 50 homs e reactância sempre perto de j 0.</div><div>A diferença consiste simplesmente no ponto de alimentação.</div><div>Alimentado como na foto ( elemento perto do reflector), é onde tem mais ganho, se alimentar no lado</div><div> da frente do rectângulo ( elemento perto do 1º director)tem mais largura de banda.</div><div><br></div><div>em anexo algumas antenas por mim desenhadas no sistema FLA.</div><div>Pode-se ver nas fotos como ligar a alimentação.</div><div>Plot de radiação e diagrama de SWR ao longo da banda.</div><div>Note esta antena é para 144mhz e tem 6 metros de boom.</div><div><br></div><div>73's</div><div> Matias</div><div><br><hr id="stopSpelling">From: ct1hix@sapo.pt<br>To: cluster@radio-amador.net<br>Subject: Re: ARLA/CLUSTER: As Yagis revolucionarias em fotos.<br>Date: Wed, 27 May 2009 18:43:46 +0100<br><br>
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<div><font face="Arial" size="2">Boas</font></div>
<div><font face="Arial" size="2">Não é uma Moxon com elementos
parazitas!!!!</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">73 Gomes CT1HIX</font></div>
<blockquote style="padding-right:0px;padding-left:5px;margin-left:5px;border-left:#000000 2px solid;margin-right:0px">
<div style="font:10pt arial">----- Original Message ----- </div>
<div style="background:#e4e4e4;font:10pt arial;font-color:black"><b>From:</b>
<a title="ct1hix@sapo.pt" href="mailto:ct1hix@sapo.pt">Gomes</a> </div>
<div style="font:10pt arial"><b>To:</b> <a title="cluster@radio-amador.net" href="mailto:cluster@radio-amador.net">Resumo Noticioso Electrónico ARLA</a>
</div>
<div style="font:10pt arial"><b>Sent:</b> Wednesday, May 27, 2009 6:12
PM</div>
<div style="font:10pt arial"><b>Subject:</b> Re: ARLA/CLUSTER: As Yagis
revolucionarias em fotos.</div>
<div><br></div>
<div><font face="Arial" size="2">Boas</font></div>
<div><font face="Arial" size="2">Uma Moxon com elementos
parazitas!!!????</font></div>
<div><font face="Arial" size="2">Pelo menos é o que me parece....</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">73 Gomes CT1HIX</font></div>
<blockquote style="padding-right:0px;padding-left:5px;margin-left:5px;border-left:#000000 2px solid;margin-right:0px">
<div style="font:10pt arial">----- Original Message ----- </div>
<div style="background:#e4e4e4;font:10pt arial;font-color:black"><b>From:</b>
<a title="joao.a.costa@ctt.pt" href="mailto:joao.a.costa@ctt.pt">João
Gonçalves Costa</a> </div>
<div style="font:10pt arial"><b>To:</b> <a title="cluster@radio-amador.net" href="mailto:cluster@radio-amador.net">'Resumo Noticioso Electrónico
ARLA'</a> </div>
<div style="font:10pt arial"><b>Cc:</b> <a title="radioamadores_algarve@yahoogrupos.com.br" href="mailto:'radioamadores_algarve@yahoogrupos.com.br'">'radioamadores_algarve@yahoogrupos.com.br'</a>
</div>
<div style="font:10pt arial"><b>Sent:</b> Wednesday, May 27, 2009 5:15
PM</div>
<div style="font:10pt arial"><b>Subject:</b> ARLA/CLUSTER: As Yagis
revolucionarias em fotos.</div>
<div><br></div>
<table class="EC_contentpaneopen">
<tbody>
<tr>
<td valign="top"><span class="small"><font color="#999999" size="2">Written by
G0KSC </font></span> </td></tr>
<tr>
<td valign="top">
<p align="center"><a href="http://www.vinecom.co.uk/"><img height="142" src="http://www.g0ksc.co.uk/images/stories/vine.gif" width="237" border="0"></a> </p>
<p align="center">Vine Antennas are the appointed UK manufaturer and
distributor of the LFA Yagi </p>
<div style="text-align:center"><a title="KMA Antennas - for LFA Yagis in North America" href="http://www.kmaantennas.com/">
<div class="EC_img_caption " style="width:575px"><img class="caption" title="KMA Have just been appointed as North American Dealer for LFA Yagis. Contact them for more information" height="99" src="http://www.g0ksc.co.uk/images/stories/kma_logo_top.gif" width="575" border="0">
KMA Have just been appointed as North American Dealer for LFA
Yagis. Contact them for more information<BR></div></a></div>
<font face="Verdana">Today I am pleased to announce the launch of the
new Loop Fed Array (LFA) Yagi antenna. The LFA Yagi is not fed with a
dipole as would be traditional Yagi antennas. Instead it is fed with a
full wave loop which is laid flat on the boom between the Reflector
and first director elements.</font><BR>
<font face="Verdana">DUBUS Magazine has the exclusive release of the
details into this antenna with some of the first models although I
will be releasing build-yourself-models and full information on
performance and how it works in the very near future.</font><BR>
<font face="Verdana">In short, the LFA provides superior performance
over the traditional Yagi in many areas and provides a platform which
provides Quad and Yagi features in one visually pleasing
package.</font><BR>
<font face="Verdana"></font><BR>
<div class="EC_img_caption " style="width:400px"><font face="Verdana"><img class="caption" title="A 70MHz LFA Yagi with a massive 10.9dBi Gain" alt="lfa" src="http://www.g0ksc.co.uk/images/stories/4mtrlfa.jpg" border="0"> </font>
<font face="Verdana">A 70MHz LFA Yagi with a massive 10.9dBi
Gain</font><BR></div>
<font face="Verdana"></font><BR>
<font face="Verdana">Please bookmark this site and check back over
the comming weeks for details of how you can build and own one of
these exciting antennas!</font><BR>
<font face="Verdana"></font><BR>
<div class="EC_img_caption " style="width:400px"><font face="Verdana"><img class="caption" title="Driving was difficult with this one. 2 X 9el LFA for 144MHz portable use" src="http://www.g0ksc.co.uk/images/stories/2x9el.jpg" border="0"> </font>
<font face="Verdana">Driving was difficult with this one. 2 X 9el LFA
for 144MHz portable use</font><BR></div>
<font face="Verdana"></font><BR>
<font face="Verdana"><em><strong>NO matching device needed, 50 Ohm
Direct feed, NO POWER RESTRICTIONS! That's the beauty of the
LFA!'</strong></em> </font><BR>
<font face="Verdana"></font><BR>
<div class="EC_img_caption " style="width:500px"><font face="Verdana"><img class="caption" title="3 element 28Mhz LFA with an incredible 9dBi Gain!" src="http://www.g0ksc.co.uk/images/stories/3el28mhzlfa.jpg" border="0"> </font>
<font face="Verdana">3 element 28Mhz LFA with an incredible 9dBi
Gain!</font><BR></div>
<font face="Verdana"></font><BR>
<font face="Verdana"> The above 3 element 28MHz LFA is now
installed at M5ADX. First 'on air' tests against a CB 18 foot vertical
showed a signal increase from S1 to S9!when switching to the G0KSC
LFA.</font><BR>
<font face="Verdana"></font><BR>
<div class="EC_img_caption " style="width:500px"><font face="Verdana"><img class="caption" src="http://www.g0ksc.co.uk/images/stories/5ellfa.jpg" border="0"></font></div>
<font face="Verdana"></font><BR>
<font face="Verdana">Above is the 5 element 50MHz LFA in use now at
G0KSC. This antenna is 4.7 metres long, has just over 11dBi forward
gain and 22dB front to back ratio at worst. More importantly, the
antenna shows a 1:1 flat SWR curve from 50 to 50.50MHz and a return
loss no lower that -30dB down, peaking at -60dB down!</font><BR>
<font face="Verdana"></font> <BR>
<font face="Verdana"></font><BR>
<div class="EC_img_caption " style="width:500px"><font face="Verdana"><img class="caption" title="a wide-spaced 5 el Yagi for 70MHz ready for the G0KSC Tower. This produces 11.3dBi and 25dB F/R" src="http://www.g0ksc.co.uk/images/stories/5el70.jpg" border="0"> </font>
<font face="Verdana">a wide-spaced 5 el Yagi for 70MHz ready for the
G0KSC Tower. This produces 11.3dBi and 25dB F/R</font><BR></div>
<font face="Verdana"></font><BR>
<font face="Verdana">With all LFA's <strong>fine</strong> tuning is
made easy by the end pieces of the loop being made out of a smaller
gauge tubing and hence, a trombone effect allows the loop to be
increased or decreased in size. </font><BR>
<font face="Verdana"></font> <BR>
<font face="Verdana"></font><BR>
<div class="EC_img_caption " style="width:500px"><font face="Verdana"><img class="caption" src="http://www.g0ksc.co.uk/images/stories/5el -50mhz 6.6metres low noise.jpg" border="0"></font></div>
<font face="Verdana"></font><BR>
<strong><font face="Verdana">Tired of all that noise you pick up from
around your own home and other building near where you
live?</font></strong><BR>
<font face="Verdana">This is the first of my new Low-Noise LFA Yagis.
Massive suppression side lobes in both the H and V plane means minium
local noise pick up and minimum interferance when transmitting.
Details on this antenna and others like it will be in the next issue
of DUBUS Magazine. The above antenna is a 5 element LFA for 50MHz with
a 6.6 metre boom made from 1.5 inch box section tube. Elements are
16mm thick while the loop is 22.23mm thick with 19.05mm end sections.
<strong>11.5dB Gain, 28dB Front to REAR</strong>. The suppresion
extends forwards by 15 degress in order to remove straight up and
straight down lobes. </font><BR>
<strong><font face="Verdana">If you are not into building
Antennas..</font></strong><BR>
<font face="Verdana"><strong>www.vinecom.co.uk </strong>- Vine
Antennas are going into production with the LFA so check their site
out and give them a call with what you are looking for!</font><BR>
<font face="Verdana"></font> <BR>
<em><strong><font face="Verdana">Best DX,</font></strong></em><BR>
<strong><font face="Verdana">Justin G0KSC</font>
</strong><BR></td></tr></tbody></table>
<BR><hr>
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