Saturday, November 21, 2015

Simple Ham Radio Antennas--Doublet aerial for HF amateur ham radio short wave bands. Post #604.


If you're having trouble viewing this video, please insert this URL into your browser search box: https://youtu.be/8ZmyvtMvEGY. Excellent antenna tutorial from Ray (G4NSJ).  In this video, Ray shows us how to design, build, and erect a simple doublet antenna that will cover amateur radio and shortwave bands between 40 and 10 meters.  The key to the success of this basic antenna is the use of open feeders such as 300 ohm television twin lead or 450 ohm ladder line to feed a dipole made up of equal lengths of wire. The ladder line achieves a better antenna element balance than coax-fed antennas and severely limits common mode currents found on coax-fed installations.  Just attach the balanced feeders to a balanced ATU (antenna tuning unit), adjust your "tuner" for the lowest SWR, and begin operating.  Over the past few years, I've learned to love balanced feed lines, since they can turn basic dipoles into multiband antennas.  My backup antenna at home is a 40 meter inverted Vee dipole fed with 450 ohm ladder line.  The antenna works very well and can be broken down easily for portable or emergency use.  For the latest Amateur Radio news and events, please check out the blog sidebars.  These news feeds are updated daily.  You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. Thanks for joining us today!  Aloha es 73 de Russ (KH6JRM).