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<DIV><FONT face=Arial>Chet,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>A balun is recommended for the Cobra Ultra-lite. This is a
note that I just sent to Rich.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Also, make sure you log on to your Yahoo account
frequently, just to work the kinks out. The more you use it, the better.
</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Note just sent to Rich:</FONT></DIV>
<DIV> </DIV>
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<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial">Rich,</SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial"></SPAN> </P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial">The current balun is recommended for the Cobra
UltraLite antenna. <A href="http://www.k1jek.com/"><FONT
color=#0000ff>http://www.k1jek.com/</FONT></A></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial"></SPAN> </P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial">Jim has decided to go with the Junior,
primarily do to space limitations. This antenna is similar to a center fed
dipole and is fed by ladder line, hence the need for the balun. Prices for
the 160-10, 80-10, and 40-6 are similar. Getting a 144 foot antenna on a
100 foot lot is more problematic. :-)</SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial"></SPAN> </P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial">Here is an excerpt from the site's
FAQ</SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial"></SPAN> </P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><B><SPAN
style="COLOR: red">Do I Need a Tuner?</SPAN></B></P>
<P style="MARGIN: 0in 0in 0pt 0.5in" class=MsoNormal>All Cobras require a
tuner. In most installations, the auto-tuner built into your transceiver
should provide sufficient tuning range. Because the Cobra presents a
balanced load, we recommend installing a 4:1 current-style balun at the
station end of the feedline (many external tuners provide a built-in
balun)</P>
<P style="MARGIN: 0in 0in 0pt 0.5in" class=MsoNormal>.<IMG border=0
src="cid:B91D0740518541CA996E0F5CDD564061@BillDell" width=309 height=136
v:shapes="_x0000_i1025"></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial">Jim has done his homework on this antenna. He
visited two hams who are using them, and got some hands on with one at
Julian's (W4VCO) shack. </SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial"></SPAN> </P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial">This simple question was a great opportunity to
do a little research for myself. I have two antennas, both dipoles, one
with, and one without a balun. The one that was store-bought, with came
with a balun, the other was a home brew that didn't require one. I have
little in-depth knowledge of balun design, but do know that sometimes they
are not needed, and in some cases make things worse when they are used.
</SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial"></SPAN> </P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial">In Jim's case he is feeding with a ladder line,
balanced, and needs to go to coax, unbalanced. Why a 4:1 I don't know. On
the surface of things, the Cobra looks like a folded dipole made from
three wire ladder line. </SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial"></SPAN> </P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial">Bill</SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial"></SPAN> </P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: Arial">PS This might be a topic for Chet, but not at
April's meeting</SPAN></P></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
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style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=LakelandARC@yahoogroups.com
href="mailto:chestercarruth@yahoo.com [LakelandARC]">chestercarruth@yahoo.com
[LakelandARC]</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=LakelandARC@yahoogroups.com
href="mailto:LakelandARC@yahoogroups.com">LakelandARC@yahoogroups.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, January 25, 2015 9:43
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [LakelandARC] Re: Can someone
help Jim with this?</DIV>
<DIV><BR></DIV><SPAN style="DISPLAY: none"> </SPAN>
<DIV id=ygrp-text>
<P>
<P>My first question is: Why do you need a balun? Second question: Why are you
buying a dipole?</P>
<P>I can provide the wire you need for a simple but very effective dipole
antenna. The impedance will be in the range of 35-75 ohms which will work just
fine into a 50 ohm coax with no balun. A folded dipole will be a higher
impedance, requiring impedance matching by some means, not necessarily a
balun.</P>
<P>Bear in mind that the dipole antenna, folded or not, will resonate at only
one frequency and that is where you would get a good match to 50 ohm coax. As
you change frequency, the impedance will change and become either inductive or
capacitive, depending on which way you move. You can change frequency a fair
amount, depending on the band, and get by with the tuner in your
radio......... The "KISS" method works very well.</P>
<P>"KISS" = Keep It Short and Simple........ no balun, no store bought
antennas, just string up a resonant length of wire for the dipole and feed it
directly with coax........... Good Luck!!<BR class=yui-cursor></P>
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