{"id":300,"date":"2015-04-10T06:16:19","date_gmt":"2015-04-10T06:16:19","guid":{"rendered":"http:\/\/vk8bn.me\/info\/?p=300"},"modified":"2020-05-06T12:58:17","modified_gmt":"2020-05-06T03:28:17","slug":"repairing-commercial-vhf-folded-dipoles","status":"publish","type":"post","link":"https:\/\/vk8bn.me\/info\/repairing-commercial-vhf-folded-dipoles\/","title":{"rendered":"Repairing Commercial VHF Folded Dipoles"},"content":{"rendered":"<p>I was looking for coax to replace the Quarter wave transformer in a commercial VHF Folded Dipole Antenna.<\/p>\n<p>Calculations for coax required to match 300 ohms to 50 ohms revealed that a coax with an impedance of approx 120 ohms is required.<\/p>\n<p>Z= \u221a300 x 50\u00a0\u00a0 equals 122 ohms. RG63 has an impedance of 125 ohms and will be the obvious replacement.. but can you find a place to buy short lengths?<\/p>\n<p>I couldn&#8217;t &#8230;.But in my search I found this<\/p>\n<p><span style=\"color: #ff0000;\"><a style=\"color: #ff0000;\" href=\"http:\/\/ve2azx.net\/technical\/CustomImpedanceCoax.pdf\">http:\/\/ve2azx.net\/technical\/CustomImpedanceCoax.pdf<\/a><\/span><\/p>\n<p>Thanks VE2AZX and VE2BPD<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I was looking for coax to replace the Quarter wave transformer in a commercial VHF Folded Dipole Antenna. Calculations for coax required to match 300 ohms to 50 ohms revealed that a coax with an impedance of approx 120 ohms is required. Z= \u221a300 x 50\u00a0\u00a0 equals 122 ohms. RG63 has an impedance of 125 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_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}},"categories":[12,14],"tags":[],"class_list":["post-300","post","type-post","status-publish","format-standard","hentry","category-antennas","category-ham-radio"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8ympN-4Q","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/posts\/300","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/comments?post=300"}],"version-history":[{"count":3,"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/posts\/300\/revisions"}],"predecessor-version":[{"id":644,"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/posts\/300\/revisions\/644"}],"wp:attachment":[{"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/media?parent=300"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/categories?post=300"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vk8bn.me\/info\/wp-json\/wp\/v2\/tags?post=300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}