{"id":2477,"date":"2020-10-26T12:10:00","date_gmt":"2020-10-26T01:10:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2020\/10\/26\/vk3ye-solving-the-direct-conversion-rx-double-sideband-tx-incompatibility-problem\/"},"modified":"2020-10-26T12:10:00","modified_gmt":"2020-10-26T01:10:00","slug":"vk3ye-solving-the-direct-conversion-rx-double-sideband-tx-incompatibility-problem","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2020\/10\/26\/vk3ye-solving-the-direct-conversion-rx-double-sideband-tx-incompatibility-problem\/","title":{"rendered":"VK3YE:  Solving the Direct Conversion RX &#8212; Double Sideband TX Incompatibility Problem"},"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\/cp4K31sFGog\" width=\"440\"><\/iframe><\/p>\n<div><\/div>\n<div><b>Peter: <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>You have long been one of the leading gurus on DSB. I remember absorbing all the info I could from your website when I was getting started in DSB back in 2001. <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>It&#8217;s great that you found the article about DSB with inverted audio. It would be very cool to build a transmitter with the inverted audio, then confirm that it could be received with a direct conversion receiver without distortion. <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b><span style=\"background-color: #fcff01;\">The incompatibility of DSB TXs and DC RXs seems like a very cruel trick of nature. <\/span> There are only a few people in the world who think about this, and most of them are in the comments section of your YouTube video! An elite group indeed. <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>Back in 2015 your review of a DSB rig got me thinking about this incompatibility: https:\/\/soldersmoke.blogspot.com\/2015\/07\/peter-parker-reviews-dsb-kit-and.html <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>It is easy to see how a slight frequency difference between TX VFO and RX VFO would cause a lot of distortion, but similar distortion would be caused by a phase difference between the two VFOs. AM SW Broadcast receivers try to minimize the effects of fading by using an internal oscillator to replace the wavering carrier &#8212; but they have to have it exactly on frequency and locked in phase with the distant station&#8217;s carrier. I have a little Sony portable that has this &#8220;synchronous detection&#8221; circuitry. It is a complicated task and I don&#8217;t think you could do it with the highly suppressed carriers of our rigs. Inverted sidebands to the rescue! <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>Thanks for the great video and all the tribal knowledge. <\/b><\/div>\n<div><b><br \/><\/b><\/div>\n<div><b>73 Bill N2CQR<\/b><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Peter: You have long been one of the leading gurus on DSB. I remember absorbing all the info I could from your website when I was getting started in DSB back in 2001. It&#8217;s great that you found the article about DSB with inverted audio. It would be very cool to build a transmitter with &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2020\/10\/26\/vk3ye-solving-the-direct-conversion-rx-double-sideband-tx-incompatibility-problem\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;VK3YE:  Solving the Direct Conversion RX &#8212; Double Sideband TX Incompatibility Problem&#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":[29,33,34,36,72,57],"tags":[],"class_list":["post-2477","post","type-post","status-publish","format-standard","hentry","category-australia","category-dsb","category-mixer-theory","category-parker-peter","category-short-wave-listening","category-superhet-receivers"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2477","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=2477"}],"version-history":[{"count":0,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2477\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=2477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=2477"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=2477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}