{"id":1299,"date":"2015-07-02T08:46:25","date_gmt":"2015-07-01T18:46:25","guid":{"rendered":"http:\/\/commons.pratt.edu\/open-source\/?p=737"},"modified":"2015-07-02T08:46:25","modified_gmt":"2015-07-01T18:46:25","slug":"heavy-duty-balun-or-unun","status":"publish","type":"post","link":"https:\/\/www.kornequipped.com\/blog\/?p=1299","title":{"rendered":"Heavy Duty BalUn or UnUn"},"content":{"rendered":"\n<p>First day of vacation and I wanted to tune up my Kenwood Ham Radio. Its a great working hybrid transceiver. It has 3 Vacuum Tubes. The driver and a matched set of finals. It also has a heater switch so you can cool off the tubes if your just listening.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/es.pratt.edu\/Commons\/Images\/amateur_radio\/ts520.png\" alt=\"\" \/><\/figure>\n\n\n\n<p>Whats an UnUn? Its a transformer used to match an unbalanced line to&nbsp; another unbalanced line of a different impedance. And A Balun is used to match a balanced line to an unbalanced line.<\/p>\n\n\n\n<p>I put a long wire antenna along the back yard. My rig has an unbalanced output and my antenna choice was a single long wire, also an unbalanced termination so I made an UnUn to match the wire to the rig.<\/p>\n\n\n\n<p>I would have preferred a balanced antenna but my back yard is about 3X longer than my front yard so if I ran a wire in opposite directions they would have been much shorter overall. I guess if I get bored I&#8217;ll try an inverted V. The conduit box option would be great for this.<\/p>\n\n\n\n<p>I drove a 6 foot ground rod into the ground right next to a fence post and mounted the UnUn right above it on the post.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/es.pratt.edu\/Commons\/Images\/amateur_radio\/unun.jpg\" alt=\"\" \/><\/figure>\n\n\n\n<p>So far it seems to work pretty well. Tennessee contacts nice and clear. Next I&#8217;ll get back to the Arduino beacon projects. I had a working Hellscrieber beacon that needed a nice waterproof housing. I&#8217;ll probably use a plastic conduit box.<\/p>\n\n\n\n<p>That might make a nice fox hunt rig too. I could hide it anywhere with just a piece of romex hanging down as the antenna. Most would overlook it as an old light box&#8230;.<\/p>\n\n\n\n<p>There&#8217;s nothing mysterious to it just a ferrite core and some wire.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/es.pratt.edu\/Commons\/Images\/amateur_radio\/ferrite.jpg\" alt=\"\" \/><\/figure>\n\n\n\n<p>How you connect the wires decides what it will be.<\/p>\n\n\n\n<p>For the whole story on how to build one check these Instructables.<\/p>\n\n\n\n<p>http:\/\/www.instructables.com\/id\/How-to-Make-a-Balun-Or-Unun\/<\/p>\n\n\n\n<p>http:\/\/www.instructables.com\/id\/Better-Balun-Boxes\/<\/p>\n","protected":false},"excerpt":{"rendered":"<p>First day of vacation and I wanted to tune up my Kenwood Ham Radio. Its a great working hybrid transceiver. It has 3 Vacuum Tubes. The driver and a matched set of finals. It also has a heater switch so you can cool off the tubes if your just listening. Whats an UnUn? Its a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1299","post","type-post","status-publish","format-standard","hentry","category-amateur-radio"],"_links":{"self":[{"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1299","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1299"}],"version-history":[{"count":0,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1299\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1299"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1299"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kornequipped.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}