{"id":1916,"date":"2020-02-19T20:15:00","date_gmt":"2020-02-19T09:15:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2020\/02\/19\/hi-per-mite-active-audio-cw-filter-installed-in-ubitx-video\/"},"modified":"2020-02-19T20:15:00","modified_gmt":"2020-02-19T09:15:00","slug":"hi-per-mite-active-audio-cw-filter-installed-in-ubitx-video","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2020\/02\/19\/hi-per-mite-active-audio-cw-filter-installed-in-ubitx-video\/","title":{"rendered":"Hi-Per-Mite Active Audio CW Filter Installed in uBITX (video)"},"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\/vUZphGgUiu4\" width=\"440\"><\/iframe><\/p>\n<p> <b>Coming home from the Dominican Republic, this was a major item on my list of desired mods for the uBITX: a narrower passband for CW. Using the 2.3 kHz SSB passband, you could have many CW QSOs audible in your headphones. Narrow that passband to 200-300 Hz and life gets a lot easier. <\/b><br \/> <b><br \/><\/b> <b>Farhan had discussed adding a 12 Mhz IF filter of suitable CW bandwidth, but this seemed difficult to me. Besides, I have long wanted to use an active audio filter for this purpose. <\/b><br \/> <b><br \/><\/b> <b>The <a href=\"http:\/\/www.4sqrp.com\/hipermite.php\">Hi-Per-Mite filter from 4 State QRP Group<\/a> is just what I needed. I built the kit without problems in about an hour, then I put it in the uBITX box, with switch on the front panel that lets me put it in the circuit or take it out &#8212; this is very satisfying and a lot of fun. <\/b><br \/> <b><br \/><\/b> <b>The Hi-Per-Mite just goes between the uBITX audio out and the speaker\/headphone connection. I built mine for &#8220;no gain&#8221; &#8212; the uBITX provides plenty of audio. <\/b><br \/> <b><br \/><\/b> <b>The selectivity with the Hi-Per-Mite compares favorably to that of my Drake 2-B with the 500 Hz LC filter. You can get an idea of the performance in the video. <\/b><br \/> <b><br \/><\/b> <b>Three cheers for the 4 State QRP Group and their Hi-Per-Mite! Here is the page with all the info: <\/b><br \/> <b><br \/><\/b> <a href=\"http:\/\/www.4sqrp.com\/hipermite.php\"><b>http:\/\/www.4sqrp.com\/hipermite.php<\/b><\/a><br \/> <b><br \/><\/b> <b><br \/><\/b><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Coming home from the Dominican Republic, this was a major item on my list of desired mods for the uBITX: a narrower passband for CW. Using the 2.3 kHz SSB passband, you could have many CW QSOs audible in your headphones. Narrow that passband to 200-300 Hz and life gets a lot easier. Farhan had &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2020\/02\/19\/hi-per-mite-active-audio-cw-filter-installed-in-ubitx-video\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Hi-Per-Mite Active Audio CW Filter Installed in uBITX (video)&#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":[64,116,16,105,117],"tags":[],"class_list":["post-1916","post","type-post","status-publish","format-standard","hentry","category-clubs","category-cw","category-filters","category-kits","category-ubitx"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/1916","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=1916"}],"version-history":[{"count":0,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/1916\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=1916"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=1916"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=1916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}