Simple Ham Radio Antennas--Construction of a 9-1 unun. Post #901.
If you're having trouble viewing this video, please insert this title link into your browser search box: https://www.youtube.com/watch?v=L4jGNFGN-RQ. Here's a handy 9:1 unun from m1tina that will make your use of a longwire antenna much more efficient and pleasurable. The 9:1 unun is an impedance transformer to feed high impedance, end-fed (unbalanced) random wire antennas, which may exhibit an impedance of a few hundred ohms. The unun transforms the impedance of the wire into something closer to 50 ohms--something your transceiver will appreciate. The 9:1 unun is wound on a T200-2 core and has 9 trifilar turns of enamel wire. This is a great weekend project! For the latest Amateur Radio news and information, please visit my news site at http://www.kh6jrm.info. If you're a radio amateur living on the Big Island of Hawaii, be sure to check my ARRL PIO (public information officer) blog at http://bigislandarrlnews.wordpress.com. Be sure to check out the blog sideb