{"id":305,"date":"2005-12-24T19:00:08","date_gmt":"2005-12-24T18:00:08","guid":{"rendered":"http:\/\/pa3hcm.utreg.net\/?p=305"},"modified":"2021-01-18T20:20:23","modified_gmt":"2021-01-18T19:20:23","slug":"hf-14-balun","status":"publish","type":"post","link":"https:\/\/www.pa3hcm.nl\/?p=305","title":{"rendered":"HF 1:4 balun"},"content":{"rendered":"\n

Introduction<\/h2>\n\n\n\n
\"hf-balun-case2\"<\/a><\/figure><\/div>\n\n\n\n

Some years ago a friend offered me an HF radio: an Icom IC-730. I decided to buy it, since I didn’t have a HF rig yet. I gave it a nice place on my shelf, connected some meters of wire on the antenna plug, and from that moment I sometimes listen to all kind of chirps and beeps. I recovered my Hamcomm modem to see some wxfax images and SSTV, I tried to follow CW QSO’s again, listened to some conversations in SSB, etc.<\/p>\n\n\n\n

Although this is not bad at all, I wanted to participate again. Since I moved to Utrecht, my radio activity was very low. I didn’t have any antennas on the roof, which made it difficult to pick up this nice and interesting hobby again. But… after participating in the 2002 jamboree on the air I decided to revive my radio hobby. And since I moved back to the country late 2005, I had all opportunities to set up antenna’s.<\/p>\n\n\n\n

The first HF antenna I wanted to build was a Windom Antenna. This antenna required a 1:4 balun, so I made one.<\/p>\n\n\n\n\n\n\n\n

Construction<\/h2>\n\n\n\n
\"bifilairbalun\"<\/a><\/figure><\/div>\n\n\n\n

The balun can be made from a T200-2 core. In my design I used only 1, since the output of my rig is about 100W. However, when using more power just stack 2 cores, they will easily handle 400 watts. Now take 2 wires and twist them arround the core like shown on the picture down here.<\/p>\n\n\n\n

That was the easy thing. Now you have to build a solid case. I found a simple solution, by using some 75mm PVC elements which are normally used for draining. One part is normally used to put in a T-junction and let you access the pipe. It has a screw top with rubber inside. The second is a simple end point to close a pipe. Both parts can be glued together (not yet, do it later) to form solid and dry case.<\/p>\n\n\n\n

Next I drilled 2 holes in the part with the unscrewable top for 2 bolts (will be used for connection both wires of the dipole). I made some holes in the other part of the case to fit a PL chassis. The picture down here shows all the details. Notice the rubber rings to be sure that no rain water will pass through the holes. Don’t forget to mount a hook somewhere, you will need it when you hang the antenna.<\/p>\n\n\n\n

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    Introduction Some years ago a friend offered me an HF radio: an Icom IC-730. I decided to buy it, since I didn’t have a HF rig yet. I gave it a nice place on my shelf, connected some meters of wire on the antenna plug, and from that moment I sometimes listen to all kind […]<\/p>\n","protected":false},"author":1,"featured_media":309,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[31],"class_list":["post-305","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-antennas","tag-balun"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"_links":{"self":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts\/305","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=305"}],"version-history":[{"count":4,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts\/305\/revisions"}],"predecessor-version":[{"id":1964,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts\/305\/revisions\/1964"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/media\/309"}],"wp:attachment":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=305"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=305"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}