Wednesday, May 15, 2019

Ham Radio - Building a 4:1 balun. Post 1868.


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.info.
http://www.arrl.org.
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).
https://oahuarrlnews.wordpress.com.
https://hamradiohawaii.wordpress.com.
https://bigislandarrlnews.com.
https://www.eham.net.
http://www.southgatearc.org.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

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Aloha es 73 de Russ (KH6JRM).