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Attached is N1IW's (SK) balun presentation he did at BARS.
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I can't find his OCFD presentation so if someone has that
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they can post it as well. We did a balun building BARS meeting
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for the 4:1 current balun and folks put up their OCF dipoles.
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Of course Mike's balun is for legal limit power. I believe N1ALO
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built a smaller version for 100 watts and is using it.
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All good info Steve.
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jim
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On 12/05/2020 9:53 PM Steven Schultz <steven.schultz.m@gmail.com> wrote:
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<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">Hello BARS,</span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;"> </span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">The Sat AM Zoom meeting today got into a discussion about Off-Center-Fed Dipoles (OCFDs). This topic raised my interest in discussing or presenting topics such as:</span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;"> </span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">Transmission Line Transformers </span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">Balun/Unun Construction </span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">Modeling Dipoles and Off-Center-Fed Dipoles with 4nec2 or EZNEC</span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">Off-Center-Fed Dipole Variations </span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">Feeding Off-Center-Fed Dipoles</span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">LTspice, a graphical SPICE tool from Linear Technology and Analog Devices</span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;"> </span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">Both 4nec2 and LTspice are free.</span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;"> </span></span></p>
<p class="MsoNormal" style="margin: 0in; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">I do not proclaim to be an expert on these topics, but over time, I have gained some worthwhile experience with them.</span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;"> </span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">What follows here are my comments about one kind of feed point mechanism for a particular OCFD. I then discuss some other feed point mechanisms for some other configurations of the OCFD.</span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;"> </span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">Read on if you wish. Feel free to pass along your comments to me about either this prelude or the discussion in the attached file.</span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;"> </span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">73’s,</span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">Steve Schultz</span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">AC1EX</span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;">BARS, Philips ARC, and MGEF</span></span></p>
<p class="MsoNormal" style="margin: 0in 0in 4pt; font-family: Calibri,sans-serif;"><span style="font-family: 'Times New Roman',serif;"><span style="font-size: large;"><a href="mailto:steven.m.schultz@ieee.org">steven.m.schultz@ieee.org</a></span></span></p>
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