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<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="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 $included="null">
<P>KMA Have just been appointed as North American Dealer for LFA Yagis.
Contact them for more information</P></DIV></A></DIV>
<P><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></P>
<P><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></P>
<P><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></P>
<P><FONT face=Verdana></FONT></P>
<DIV class="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
$included="null"> </FONT>
<P><FONT face=Verdana>A 70MHz LFA Yagi with a massive 10.9dBi
Gain</FONT></P></DIV>
<P><FONT face=Verdana></FONT></P>
<P><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></P>
<P><FONT face=Verdana></FONT></P>
<DIV class="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
$included="null"> </FONT>
<P><FONT face=Verdana>Driving was difficult with this one. 2 X 9el LFA for
144MHz portable use</FONT></P></DIV>
<P><FONT face=Verdana></FONT></P>
<P><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></P>
<P><FONT face=Verdana></FONT></P>
<DIV class="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
$included="null"> </FONT>
<P><FONT face=Verdana>3 element 28Mhz LFA with an incredible 9dBi
Gain!</FONT></P></DIV>
<P><FONT face=Verdana></FONT></P>
<P><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></P>
<P><FONT face=Verdana></FONT></P>
<DIV class="img_caption " style="WIDTH: 500px"><FONT face=Verdana><IMG
class=caption src="http://www.g0ksc.co.uk/images/stories/5ellfa.jpg"
border=0 $included="null"></FONT></DIV>
<P><FONT face=Verdana></FONT></P>
<P><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></P>
<P><FONT face=Verdana></FONT> </P>
<P><FONT face=Verdana></FONT></P>
<DIV class="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
$included="null"> </FONT>
<P><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></P></DIV>
<P><FONT face=Verdana></FONT></P>
<P><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></P>
<P><FONT face=Verdana></FONT> </P>
<P><FONT face=Verdana></FONT></P>
<DIV class="img_caption " style="WIDTH: 500px"><FONT face=Verdana><IMG
class=caption
src="http://www.g0ksc.co.uk/images/stories/5el%20-50mhz%206.6metres%20low%20noise.jpg"
border=0 $included="null"></FONT></DIV>
<P><FONT face=Verdana></FONT></P>
<P><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></P>
<P><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></P>
<P><STRONG><FONT face=Verdana>If you are not into building
Antennas..</FONT></STRONG></P>
<P><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></P>
<P><FONT face=Verdana></FONT> </P>
<P><EM><STRONG><FONT face=Verdana>Best DX,</FONT></STRONG></EM></P>
<P><STRONG><FONT face=Verdana>Justin G0KSC</FONT>
</STRONG></P></TD></TR></TBODY></TABLE></BODY></HTML>