Saturday, July 18, 2015

Simple Ham Radio Antennas--Why dipole antennas are a half wave long. Post #493.


If you're having trouble viewing this video, please insert the following URL into your browser search box: https://youtu.be/iInJkG8YPkA. A good general review of basic antenna theory for those just entering the amateur radio hobby.  Although the video is well done and easily understood, Carl Oliver fails to mention the role of the magnetic field, which contains the antenna current. Both the electrical and magnetic fields are required for radiation to occur.  Carl also states that full wave antennas will not radiate.  That's not necessarily the case.  The Extended Double Zepp is a full wave dipole-like antenna that does very well with a balanced tuner and 450 ohm ladder line.  Despite these shortcomings, Carl Oliver does a good job of outlining basic antenna theory for those just entering the hobby. Perhaps Carl has over generalized a bit.  He should probably do a follow up video incorporating subject areas he overlooked.  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).