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"Blowing away the smoke and mirrors of antenna operation" by Roy Lewallen, W7EL

Roy, W7EL, blows away some of the most pervasive smoke and mirrors obscuring how antennas really work. While performing three feats of seemingly impossible antenna design, reveals the science involved as well as how it’s often cloaked in the mist. Roy is the author of #EzNEC antenna modelling software. Vienna Wireless Society is one of the largest and most active Amateur Radio clubs in Northern Virginia. To learn more, please visit Club's web site: http://viennawireless.net/wp/ To receive notifications about future live streams, and participate in discussions and activities, please join the Club: https://viennawireless.net/wp/join/ You can also browse the archive of past presentations: https://viennawireless.net/wp/meeting... 0:00 Introduction 4:10 Great Secrets Revealed! Great Wonders Explained! 7:11 The Real Basics... 8:18 Just what is "#gain", and where does it come from? 13:25 Example: Vertical Dipole 16:34 Antenna Patterns are 3-Dimensional! 18:59 Isotropic Radiator 19:30 How to estimate the gain of a multiple-element antenna 20:08 A few words about dBi and dBd 21:36 The W7EL 4.47 dBd Gain Dipole 32:26 0.01 Wavelength Dipole Current Distribution 34:07 Losses 36:47 Efficiency 37:24 The S-Unit 41:20 The W7EL 56 S-Unit Beam 45:00 The W7EL All-Band Low SWR Antenna 46:05 Summary #antenna #antennamodelling #modelling #electromagneticwave #antennapattern #hamradio #hamr