Tuesday, November 24, 2015

Simple Ham Radio Antennas--40 Meter 30 ft. Vertical--Home Brew Antenna. Post #607.


If you're having difficulty in viewing this video, please insert this into your browser search box: https://youtu.be/ztwLdIm6wsM.  A simple, easy to understand tutorial on how to design, build, and use a 40 meter vertical antenna.  Jack Demaree made this video after deciding to repair and rebuild his original 40 meter vertical (the one in the video) after several years of use.  Jack used locally available materials, including a short length of schedule 40 PVC pipe, an aluminum plate, a 30 ft./9.14 meters length of 3 inch/7.62 cm diameter irrigation pipe, 60 quarter wave radials, a top hat consisting of three, 18 inch/45.72 cm rods, and a 50 ohm coaxial cable feedline.  With careful trimming, Jack didn't need an antenna transmatch ("tuner") to cover the 40 meter amateur radio band. This simple 40 meter vertical antenna will also work on the 15 meter amateur radio band, using the 3rd harmonic of 40 meters.  An antenna transmatch would be helpful for this band, since SWR would be higher than on the 40 meter band.  Jack says the antenna has a SWR of 1:1 for the 40 meter band.  If you wanted coverage from 40 through 10 meters, you could feed the antenna with 300 ohm television twin lead or 450 ohm ladder line. The feedline would then go into a 4:1 balun and then on to the antenna transmatch via a short length of 50 ohm coaxial cable.  This antenna would make an excellent weekend project and wouldn't cost much money.  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).