{"id":683,"date":"2011-05-07T18:21:16","date_gmt":"2011-05-07T23:21:16","guid":{"rendered":"http:\/\/w0ep.us\/OM\/?p=683"},"modified":"2011-05-07T18:35:50","modified_gmt":"2011-05-07T23:35:50","slug":"vhf-dual-port-isolator","status":"publish","type":"post","link":"http:\/\/w0ep.us\/OM\/?p=683","title":{"rendered":"VHF dual port isolator"},"content":{"rendered":"<p>[Today&#8217;s run: 7 miles with Boardtown Runners]<\/p>\n<p>Today&#8217;s picture is of a dual port RF isolator for the VHF range (this one says 160-174 Mhz on it&#8217;s label).<\/p>\n<p>A dual port RF isolator can be used as an RF separation between a transmitter\/receiver and the antenna.  As I understand, it is kind of a one-way gate that allows the signal to pass in one direction only.  Anything going in the other direction is shunted into another port to which is usually attached a dummy load (dead end).<\/p>\n<p>In this picture the isolator is the larger rectangle. Two dummy loads are attached, both of them have heat sink fin structures.  The smaller black box is a harmonic filter which helps attenuate overtones of the passing signal.<br \/>\nA setup like this might be used as part of a repeater duplexer, in combination with some cavity filters.  <a href=\"http:\/\/www.repeater-builder.com\/tx-rx\/tx-rx-elementary-introduction-to-ferrite-isolators-circulators-and-rf-loads.pdf\">Here is a write-up on circulators, isolators and their uses<\/a> from the <a href=\"http:\/\/www.repeater-builder.com\">www.repeater-builder.com<\/a> website.<br \/>\n<a rel=\"attachment wp-att-684\" href=\"http:\/\/w0ep.us\/OM\/?attachment_id=684\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-684\" title=\"IM000693.JPG\" src=\"http:\/\/w0ep.us\/OM\/wp-content\/uploads\/2011\/05\/IM000693-700x525.jpg\" alt=\"\" width=\"700\" height=\"525\" srcset=\"http:\/\/w0ep.us\/OM\/wp-content\/uploads\/2011\/05\/IM000693-700x525.jpg 700w, http:\/\/w0ep.us\/OM\/wp-content\/uploads\/2011\/05\/IM000693-1024x768.jpg 1024w, http:\/\/w0ep.us\/OM\/wp-content\/uploads\/2011\/05\/IM000693.jpg 2048w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>[Today&#8217;s run: 7 miles with Boardtown Runners] Today&#8217;s picture is of a dual port RF isolator for the VHF range (this one says 160-174 Mhz on it&#8217;s label). A dual port RF isolator can be used as an RF separation between a transmitter\/receiver and the antenna. As I understand, it is kind of a one-way [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-683","post","type-post","status-publish","format-standard","hentry","category-ham-radio"],"_links":{"self":[{"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/posts\/683","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=683"}],"version-history":[{"count":21,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/posts\/683\/revisions"}],"predecessor-version":[{"id":705,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=\/wp\/v2\/posts\/683\/revisions\/705"}],"wp:attachment":[{"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=683"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=683"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/w0ep.us\/OM\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=683"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}