{"id":1449,"date":"2020-03-17T16:18:21","date_gmt":"2020-03-17T15:18:21","guid":{"rendered":"https:\/\/pa3csg.nl\/?page_id=1449"},"modified":"2020-03-17T16:26:51","modified_gmt":"2020-03-17T15:26:51","slug":"45-mhz-high-pass-filter","status":"publish","type":"page","link":"https:\/\/pa3csg.nl\/?page_id=1449","title":{"rendered":"45 MHz High Pass Filter"},"content":{"rendered":"<p>To protect my 50 &amp; 70 MHz transceiver against high RF from the HF station, the antennas are only separated 1 meter apart I designed a High Pass Filter with a cut-off frequency of 45 MHz. For this design I used the ELSIE software. You can find this super software <a href=\"http:\/\/tonnesoftware.com\/elsie.html\">HERE<\/a><\/p>\n<p>The filter proofed to be working fine. The results were the following:<\/p>\n<p>S21\u00a0\u00a0\u00a0\u00a0\u00a0 50 MHz\u00a0\u00a0\u00a0\u00a0\u00a0 -0,4dB<\/p>\n<p>S21\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 70 MHz\u00a0\u00a0\u00a0\u00a0 -0,3dB<\/p>\n<p>S21\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30 MHz\u00a0\u00a0\u00a0\u00a0 -42dB<\/p>\n<p>S21\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 20 MHz\u00a0\u00a0\u00a0\u00a0 -70dB<\/p>\n<p>S11\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 50\u00a0 &#8211;\u00a0 70 MHz\u00a0\u00a0\u00a0 20 &#8211; 25dB<\/p>\n<p>Very nice results. Tuning is done by streching and pressing the inductors for best result.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-large wp-image-1450\" src=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2020\/03\/45MHz-High-Pass-Filter-1024x555.jpg\" alt=\"\" width=\"1024\" height=\"555\" srcset=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2020\/03\/45MHz-High-Pass-Filter-1024x555.jpg 1024w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2020\/03\/45MHz-High-Pass-Filter-600x325.jpg 600w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2020\/03\/45MHz-High-Pass-Filter-300x163.jpg 300w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2020\/03\/45MHz-High-Pass-Filter.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>To protect my 50 &amp; 70 MHz transceiver against high RF from the HF station, the antennas are only separated 1 meter apart I designed <a class=\"mh-excerpt-more\" href=\"https:\/\/pa3csg.nl\/?page_id=1449\" title=\"45 MHz High Pass Filter\">[&#8230;]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":1450,"parent":0,"menu_order":81,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"categories":[38,16],"tags":[],"_links":{"self":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/1449"}],"collection":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1449"}],"version-history":[{"count":1,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/1449\/revisions"}],"predecessor-version":[{"id":1452,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/1449\/revisions\/1452"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/media\/1450"}],"wp:attachment":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1449"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}