If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=l5rLI8FpM9g. If you're using a balanced feed line to energize your OCF (off-center fed) dipole, an EDZ (extended double zepp) antenna, or even a full-sized loop antenna, a 4:1 current balun is a necessary component to these popular HF antennas. Used with an antenna transmatch (i.e. "tuner"), the easily-made 4:1 balun keeps excessive SWR in check, cuts back on RFI, and keeps common mode currents off your feed line. In this video from Kevin Loughin (KB9RLW), we see how a couple of type 43 toroids, a common resistor, and some surplus wire pieces can be transformed into a useful, efficient 4:1 balun. Kevin's explanations and demonstrations are clear, insightful, and easily understood. Make one of these baluns for your next HF antenna. For the latest Amateur/Ham Radio news and information, please visit these websites: http://www.HawaiiARRL.
A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas.