{"id":1192,"date":"2006-04-30T20:18:00","date_gmt":"2006-04-30T20:18:00","guid":{"rendered":"http:\/\/www.ni0l.com\/?p=1192"},"modified":"2006-04-30T20:18:00","modified_gmt":"2006-04-30T20:18:00","slug":"homebrew-vertical-dipole","status":"publish","type":"post","link":"https:\/\/www.n0zb.com\/index.php\/2006\/04\/30\/homebrew-vertical-dipole\/","title":{"rendered":"Homebrew vertical dipole"},"content":{"rendered":"

I’ve been looking around for good ideas for a portable HF antenna and finally settled on Robert Johns’ (W3JIP) plan from a QST article (Aug 88). The antenna design is a vertical dipole (6M to 40M), using a loading coil at the base of the vertical with a tap and the other half the dipole is formed with a 1\/2 wave length cut of wire. The coil is mounted on a 3\/4″ PVC pipe which slips into a 6″ length of aluminum tubing. The tubing then slides into a bracket designed to hold a flag. Mounted on the bracket is a SO-239 with the center pin making contact with the bracket. The main element sitting on top of the coil is 8′, but you can lengthen it to 11′.<\/p>\n

I spent the morning gathering the parts, had a hard time with some of the specific items, but ended up with a couple work-arounds. I put the coil together first, that went pretty easy. W3JIP’s plan calls for #8 aluminum ground wire for the coil – which no one has. I used copper instead. I wrapped the copper around a 4″ piece of PVC. The directions call for 12 turns, but I only purchased 12′ of copper (the directions didn’t say what length to get)… ended up getting 9 turns. I mounted the coil to the PVC and then secured the trailing end up the coil to a piece of aluminum tubing inserted inside the PVC. The element gets mounted above the coil and I secure the tap at the base of the element.<\/p>\n

Once I had everything together, I went outside and mounted the coil section to the top of a tripod, inserted the 8′ aluminum element above the coil, set the tap at the top of the coil, ran a length of wire out as the other half of the dipole, ran some RG-58 out from my Icom 706 and after playing with the tap a bit was able to get out to Texas on 20M.<\/p>\n

I have some more work to do:
\n– better secure the SO-239’s center pin to the bracket and bottom of the coil
\n– attach a banana plug to the ground side of the SO-239 to allow quick changes for switching bands
\n– find a way to secure the base of the antenna to a painter’s pole<\/p>\n

I know the antenna will work on 20M, now I would just like to get it working on 40M.<\/p>\n","protected":false},"excerpt":{"rendered":"

I’ve been looking around for good ideas for a portable HF antenna and finally settled on Robert Johns’ (W3JIP) plan from a QST article (Aug 88). The antenna design is a vertical dipole (6M to 40M), using a loading coil at the base of the vertical with a tap and the other half the dipole … Continue reading “Homebrew vertical dipole”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[11],"tags":[27,140],"class_list":["post-1192","post","type-post","status-publish","format-standard","hentry","category-radio","tag-antenna","tag-kits-homebrew"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p9vUOZ-je","jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.n0zb.com\/index.php\/wp-json\/wp\/v2\/posts\/1192","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.n0zb.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.n0zb.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.n0zb.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.n0zb.com\/index.php\/wp-json\/wp\/v2\/comments?post=1192"}],"version-history":[{"count":0,"href":"https:\/\/www.n0zb.com\/index.php\/wp-json\/wp\/v2\/posts\/1192\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.n0zb.com\/index.php\/wp-json\/wp\/v2\/media?parent=1192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.n0zb.com\/index.php\/wp-json\/wp\/v2\/categories?post=1192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.n0zb.com\/index.php\/wp-json\/wp\/v2\/tags?post=1192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}