Monday, April 6, 2015

Simple Ham Radio Antennas--40 Meter Dipole.wmv. Post #405.


A basic, simple dipole that will get you on the air quickly. As commenters have mentioned, cut the antenna a bit longer for each element (2) to allow for trimming and SWR adjustment. If you want to use this antenna for both 40 and 15 meters without adding outrigger sections, cut the 40 meter elements for the low CW frequencies and the antenna will work on the third harmonic for the SSB portion of 15 meters. Most antenna transmatches ("tuners") will be able to handle the small mismatch in the antenna for each band. When I built one of these antennas, I cut the 40 meter portion for 7.088 Mhz (the Hawaii Afternoon net frequency). The antenna was pretty well matched at 21.264 MHz in the SSB part of the 15 meter band. Of course, you could cut the antenna for 40 meters and feed the dipole with 450 ohm ladder line into a 4:1 balun and then into your antenna tuner for coverage between 40 and 10 meters. Either way, the basic 40 meter dipole is a nice performer if you can get it up more than 30-ft/9.14 meters above ground. Have fun! 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 e-mail subscription or by tapping into the blog RSS feed. Thanks for joining us today! Aloha es 73 de Russ (KH6JRM).