{"id":8567,"date":"2021-08-03T14:30:00","date_gmt":"2021-08-03T04:30:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2021\/08\/03\/aftia-the-audio-frequency-termination-insensitive-amplifier-from-w7zoi\/"},"modified":"2025-07-22T18:04:37","modified_gmt":"2025-07-22T08:04:37","slug":"aftia-the-audio-frequency-termination-insensitive-amplifier-from-w7zoi","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2021\/08\/03\/aftia-the-audio-frequency-termination-insensitive-amplifier-from-w7zoi\/","title":{"rendered":"AFTIA!  The Audio Frequency Termination Insensitive Amplifier from W7ZOI"},"content":{"rendered":"<p style=\"text-align: center;\"> <a href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2021\/08\/AFTIA2.png\" style=\"margin-left: 1em; margin-right: 1em;\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" data-original-height=\"296\" data-original-width=\"384\" height=\"247\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2021\/08\/AFTIA2.png\" width=\"320\" \/><\/a><\/p>\n<div class=\"separator\" style=\"clear: both; text-align: left;\"><b>It really pays to check <a href=\"http:\/\/w7zoi.net\/\">Wes Hayward&#8217;s web site<\/a>. I looked yesterday and found something that we really need: A termination insensitive amplifier for audio frequencies &#8212; an AFTIA. Just last week I was looking at the AF amplifier of my Mythbuster rig, wishing that it had TIA properties. Now, thanks to Wes, we have a circuit available: <\/b><a href=\"http:\/\/w7zoi.net\/audio-fba.pdf\"><b>http:\/\/w7zoi.net\/audio-fba.pdf<\/b><\/a><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\"><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\"><b>And let&#8217;s not forget that it was Wes Hayward W7ZOI and Bob Kopski K3NHI whose <a href=\"http:\/\/w7zoi.net\/bidirectional_matched_amplifier.pdf\">2009 article<\/a> alerted us to the RF variety of termination insensitive feedback amplifiers. <\/b><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>It really pays to check Wes Hayward&#8217;s web site. I looked yesterday and found something that we really need: A termination insensitive amplifier for audio frequencies &#8212; an AFTIA. Just last week I was looking at the AF amplifier of my Mythbuster rig, wishing that it had TIA properties. Now, thanks to Wes, we have &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2021\/08\/03\/aftia-the-audio-frequency-termination-insensitive-amplifier-from-w7zoi\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;AFTIA!  The Audio Frequency Termination Insensitive Amplifier from W7ZOI&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":8568,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84,193,60],"tags":[],"class_list":["post-8567","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amplifier-theory","category-bitx-digi-tia","category-hayward-wes"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8567","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=8567"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8567\/revisions"}],"predecessor-version":[{"id":8569,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8567\/revisions\/8569"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/8568"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=8567"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=8567"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=8567"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}