{"id":8297,"date":"2020-02-21T10:35:00","date_gmt":"2020-02-20T23:35:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2020\/02\/21\/ph2lbs-homebrew-hi-per-mite-cw-filter-in-his-ubitx\/"},"modified":"2020-02-21T10:35:00","modified_gmt":"2020-02-20T23:35:00","slug":"ph2lbs-homebrew-hi-per-mite-cw-filter-in-his-ubitx","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2020\/02\/21\/ph2lbs-homebrew-hi-per-mite-cw-filter-in-his-ubitx\/","title":{"rendered":"PH2LB&#8217;s Homebrew Hi-Per-Mite CW Filter in his uBITX"},"content":{"rendered":"<p><iframe loading=\"lazy\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\" frameborder=\"0\" height=\"247\" src=\"https:\/\/www.youtube.com\/embed\/zIJcJKCQtwE\" width=\"440\"><\/iframe><\/p>\n<p> <b>I really like the way Lex PH2LB measures and demonstrates the effectiveness of the Hi-Per-Mite CW filter designed by David Cripes NM0S. Watch the short video above. The blue trace is the audio input to the filter, the orange trace is the output. Watch the output change as Lex sweeps the audio frequency range. <\/b><br \/> <b><br \/><\/b> <b>He wrote: <\/b><br \/> <b><br \/><\/b> <b><i><span style=\"background-color: white; color: #555555; font-family: \"noto sans\" , sans-serif; font-size: 16px;\">After studying the schematic I shifting through my spare parts stock to collected the components and build one according there design on a breadboard <\/span><span style=\"background-color: yellow; color: #555555; font-family: \"noto sans\" , sans-serif; font-size: 16px;\">(I changed the center frequency from 700 to 600Hz).<\/span><\/i><\/b><br \/> <span style=\"background-color: white; color: #555555; font-family: \"noto sans\" , sans-serif; font-size: 16px;\"><b><i>I hooked up my signal generator with a amplitude of 2v max and sweeped it from 250Hz to 2KHz looking at the output on my rigol osciloscoop. On 2khz VMAX=0.04V, 885Hz=0.2V, 700Hz=1.5V, 662-585Hz=2V, 400Hz=0.2V, 500Hz=0.9V, 250Hz=0.04V. So a nice flat top between 585Hz to 662Hz.<\/i><\/b><\/span><br \/> <span style=\"background-color: white; color: #555555; font-family: \"noto sans\" , sans-serif; font-size: 16px;\"><b><br \/><\/b><\/span> <span style=\"color: #555555; font-family: \"noto sans\" , sans-serif;\"><span style=\"background-color: white;\"><b>A full description of Lex&#8217;s project (with more videos) is here: <\/b><\/span><\/span><br \/> <span style=\"color: #555555; font-family: \"noto sans\" , sans-serif;\"><span style=\"background-color: white;\"><b><br \/><\/b><\/span><\/span> <a href=\"https:\/\/www.ph2lb.nl\/blog\/index.php?page=ubitx-mods3#ubitx-mod14\"><b>https:\/\/www.ph2lb.nl\/blog\/index.php?page=ubitx-mods3#ubitx-mod14<\/b><\/a><br \/> <b><br \/><\/b> <b>Lex&#8217;s Knack Story and the intro to his blog is here: <a href=\"https:\/\/www.ph2lb.nl\/blog\/index.php?page=history\">https:\/\/www.ph2lb.nl\/blog\/index.php?page=history<\/a><\/b><br \/> <b><br \/><\/b><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I really like the way Lex PH2LB measures and demonstrates the effectiveness of the Hi-Per-Mite CW filter designed by David Cripes NM0S. Watch the short video above. The blue trace is the audio input to the filter, the orange trace is the output. Watch the output change as Lex sweeps the audio frequency range. He &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2020\/02\/21\/ph2lbs-homebrew-hi-per-mite-cw-filter-in-his-ubitx\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;PH2LB&#8217;s Homebrew Hi-Per-Mite CW Filter in his uBITX&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[116,16,166,117],"tags":[],"class_list":["post-8297","post","type-post","status-publish","format-standard","hentry","category-cw","category-filters","category-netherlands","category-ubitx"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8297","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=8297"}],"version-history":[{"count":0,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8297\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=8297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=8297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=8297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}