{"id":6501,"date":"2012-01-31T12:01:00","date_gmt":"2012-01-31T01:01:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2012\/01\/31\/some-audio-shielding\/"},"modified":"2025-07-21T21:06:56","modified_gmt":"2025-07-21T11:06:56","slug":"some-audio-shielding","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2012\/01\/31\/some-audio-shielding\/","title":{"rendered":"Some Audio Shielding"},"content":{"rendered":"<p><a onblur=\"try {parent.deselectBloggerImageGracefully();} catch(e) {}\" href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2012\/01\/audioshield.jpg\"><img decoding=\"async\" style=\"display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 299px;\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2012\/01\/audioshield.jpg\" alt=\"\" id=\"BLOGGER_PHOTO_ID_5703765425776157570\" border=\"0\" \/><\/a><span style=\"font-size:130%;\"><span style=\"font-weight: bold;\">As I was aligning my &#8220;23\/24 Re-cycle&#8221; 17 meter SSB rig, I noticed the tell-tale sounds of RF getting into my audio. (I guess I should be pleased &#8212; my amplifiers are now producing enough RF to cause some trouble!) So this morning I went in and battened down the hatches in the AF part of the rig. Lead lengths were reduced. Unshielded cables were replaced with RG-174 (with due attention to &#8220;Murphy&#8217;s Whiskers&#8221;). A ferrite bead was placed on the wire that carries voltage to the op-amp chip. I wrapped some foil (actually some of that conductive tape used to protect windows in alarm systems) around the plug on the D-104). And finally I cut out two pieces of PC board and made a shield for the whole AF section (see above). I think all this has had the desired effect. The audio sounds clean. I have the day off today, so if there are no Coronal Mass Ejections I hope to make some contacts on 17. Stay tuned! <\/span><br \/><\/span><br \/>Our book: &#8220;SolderSmoke &#8212; Global Adventures in Wireless Electronics&#8221;<a href=\"http:\/\/soldersmoke.com\/book.htm\">http:\/\/soldersmoke.com\/book.htm<\/a>Our coffee mugs, T-Shirts, bumper stickers: <a href=\"http:\/\/www.cafepress.com\/SolderSmoke\">http:\/\/www.cafepress.com\/SolderSmoke<\/a>Our Book Store: <a href=\"http:\/\/astore.amazon.com\/contracross-20\">http:\/\/astore.amazon.com\/contracross-20<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As I was aligning my &#8220;23\/24 Re-cycle&#8221; 17 meter SSB rig, I noticed the tell-tale sounds of RF getting into my audio. (I guess I should be pleased &#8212; my amplifiers are now producing enough RF to cause some trouble!) So this morning I went in and battened down the hatches in the AF part &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2012\/01\/31\/some-audio-shielding\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Some Audio Shielding&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":6502,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44,23,25],"tags":[],"class_list":["post-6501","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-17-meters","category-ssb","category-troubleshooting"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/6501","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=6501"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/6501\/revisions"}],"predecessor-version":[{"id":6503,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/6501\/revisions\/6503"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/6502"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=6501"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=6501"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=6501"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}