Brian Beezley, K6STI designed a 9-element Yagi for the 88-108 MHz VHF-FM band with a horizontal folded dipole and three reflectors. His antenna optimizer managed to achieve 7-8 dBd gain and F/R up to 30dB over entire bandwidth. You can write your own review of the K6STI Yagi Optimizer. KM1H Rating: 5. Send this review to a friend! Best optimizer on the globe Time owned: more than. Yagi Optimizer is an old DOS program made more than. From here you can Download Yagi Optimizer 6. I have been trying to obtain a copy of K6STI Yagi Optimizer. Log-Yagis Log-Yagis A log-Yagi is a log-periodic driver cell with parasitic elements. It can provide an excellent wideband pattern at lower material cost than a Yagi with similar performance. However, log-Yagis are more complex and difficult to build, and the designs presented below are sensitive to certain dimensions and ground proximity. Consider building one if you can verify the pattern and don't mind some tinkering to achieve best performance. Five-Element Log-Yagi This antenna has one reflector, two driven elements, and two directors on a 79″ boom. Bending three elements improves both forward gain and the pattern. The red dot is the 75Ω feedpoint and the green dot is an inductor. A hairpin match uses another inductor across the feedpoint. I designed the antenna with the AO 9.61 Antenna Optimizer, trading forward gain for low backlobes. This shows phasing line detail. Blue dots mark analysis segments. Modeling Results Calculated performance is for 28 analysis segments per element halfwave and phasing line segment length equal to the line spacing. Forward gain includes mismatch and conductor losses. F/R is the ratio of forward power to that of the worst backlobe in the rear half-plane. ![]() ![]() Product Reviews Average rating Last review MSRP 1 5.0 14-Jan-2014 $Free 17 5.0 03-Jul-2016 $0.01 7 4.9 29-Nov-2016 $199 6 2.7 26-Jun-2009 $39 1 5.0 20-Mar-2011 $ 49.00 4 1.3 02-Nov-2007 $(missing) 6 3.5 05-Oct-2004 $39.95 4 4.0 19-Sep-2007 $35 17 3.2 24-Nov-2013 $$39.00 12 3.8 08-Apr-2010 $39.00 2 5.0 15-Apr-2015 $40 1 5.0 11-Oct-2004 $20.00 13 1.5 15-Apr-2007 $38 6 4.0 11-Apr-2009 $49.00 9 3.1 05-Apr-2014 $39.00 22 1.2 18-Jul-2010 $$40 14 3.4 26-Jun-2013 $39.95 4 2.3 03-Nov-2007 $$59.99? WB Audio Section: K6JRF 10/7/2008 K6JRF's Page formerly W6FZC Yagi Design Techniques (Updated: May 21, 2010) This new section shows the actual design of a monoband yagi employing Yagi Optimizer [YO], and Antenna Optimizer [AO] software to detail the steps required to initiate, analyze and complete the real-world design of any antenna. K6STI's AO, YO and TA Software.. During the early 1990s thru 1998, an excellent antenna analysis software was bought to market. Written by Brian Beezley, the sw packages were called Yagi Optimizer [YO], Antenna Optimizer [AO] and Terrain Analyser [TA]. Using the three programs, any antenna (wire, verticals, yagis, quads, etc) can be completely characterized in a few minutes over most any terrain. This fine antenna software is no longer offered and there's is no way to purchase it... About 14 years ago, I used this sw to design a 4el 20mtr monoband yagi on a 41' boom. The starting point was a Japanese antenna (CL20, 31' boom). The final results are shown. As you see, the f/g was 10.3dBi with 28dB f/b ratio. The 'bad' part was the low feed impedance [ 9 ohms] but... That's exactly the way I designed it! Was only was interested in covering the low phone portion of the 20mtr band and it did that in style. The sw is an excellent design tool provided some simple rules are followed. Designing Yagis I just love building yagis right from the first time I constructed a 5el, 20mtr monoband yagi on a 53' boom! The picture shows it in contrast to another home brew 3el, 15mtr monoband yagi on 21' boom. It certainly looks small! The 'bad' part was the fact that this was built using the 'handbook' dimensions. It worked but it didn't work as it should have. It took apx another 1 year to 'tune' the antenna to get some 'real' f/g from it. That was in the days before antenna design SW. Why didn't it work? Simply b/c the element's taper schedule was not properly taken into account so all of the elements were basically too short!
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