{"id":10951,"date":"2021-07-11T13:14:00","date_gmt":"2021-07-11T03:14:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2021\/07\/11\/a-video-series-on-the-mythbuster-75-20-rig-video-1\/"},"modified":"2025-07-22T18:04:40","modified_gmt":"2025-07-22T08:04:40","slug":"a-video-series-on-the-mythbuster-75-20-rig-video-1","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2021\/07\/11\/a-video-series-on-the-mythbuster-75-20-rig-video-1\/","title":{"rendered":"A Video Series on the Mythbuster 75\/20 Rig &#8212; Video #1"},"content":{"rendered":"<p><iframe loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\" frameborder=\"0\" height=\"247\" src=\"https:\/\/www.youtube.com\/embed\/ogXb38x5FTc?rel=0\" title=\"YouTube video player\" width=\"440\"><\/iframe><\/p>\n<div><\/div>\n<div><b>I am happy to report great progress on the Mythbuster project. I have the receiver working on both 75\/80 and 20 meters. And it in fact inverts the 75 meter LSB signals, turning them into 5.2 MHz USB signals for passage through my 5.2 MHz USB filter\/BFO combo. No switching or shifting of the BFO is needed. <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>I am following Farhan&#8217;s BITX20 advice &#8212; I have paused in the construction and am enjoying the receiver that I have built. I&#8217;ll build the transmit circuitry later. <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>Inspired by Frank Jones (you really should be reading <a href=\"http:\/\/soldersmoke.blogspot.com\/2021\/07\/summer-reading-for-homebrewers-frank.html\">the FMLA articles)<\/a> I have this rig prototyped &#8220;Al Fresco&#8221; on a pine board that I found discarded on a neighbors front stoop. <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>There is no RF amplifier in this rig. Following the advice of multiple receiver gurus, I ran the BP filters right into the ADE-1 diode ring mixer. I have the TIA amps set at about 24 dbm. There is a lot of audio gain from the LM386 and the audio pre-amp. This seems to be enough, even on 20. I hear the band noise when I connect the antenna on both 75 and 20. <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>Here is the first video in the series. I&#8217;m posting them first on <a href=\"https:\/\/www.patreon.com\/SolderSmoke\">Patreon<\/a>, then, a few days later, here and on the YouTube channel. <\/b><\/div>\n<div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>I am happy to report great progress on the Mythbuster project. I have the receiver working on both 75\/80 and 20 meters. And it in fact inverts the 75 meter LSB signals, turning them into 5.2 MHz USB signals for passage through my 5.2 MHz USB filter\/BFO combo. No switching or shifting of the BFO &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2021\/07\/11\/a-video-series-on-the-mythbuster-75-20-rig-video-1\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;A Video Series on the Mythbuster 75\/20 Rig &#8212; Video #1&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66,10,34,132,23,57],"tags":[],"class_list":["post-10951","post","type-post","status-publish","format-standard","hentry","category-farhan","category-jones-frank","category-mixer-theory","category-mythbuster","category-ssb","category-superhet-receivers"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/10951","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=10951"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/10951\/revisions"}],"predecessor-version":[{"id":11459,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/10951\/revisions\/11459"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=10951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=10951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=10951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}