{"id":8361,"date":"2021-10-30T16:14:00","date_gmt":"2021-10-30T05:14:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2021\/10\/30\/using-noise-to-sweep-a-filter-with-the-tinysa\/"},"modified":"2025-07-22T18:04:30","modified_gmt":"2025-07-22T08:04:30","slug":"using-noise-to-sweep-a-filter-with-the-tinysa","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2021\/10\/30\/using-noise-to-sweep-a-filter-with-the-tinysa\/","title":{"rendered":"Using Noise to Sweep a Filter with the TinySA"},"content":{"rendered":"<\/p>\n
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I’ve been meaning to try this for a long time. Years ago Tony Fishpool and Graham Firth wrote about using a noise generator and a spectrum analyzer to sweep the bandpass of a filter. <\/b>The idea here is to send very broadband noise into a filter, and then use a spectrum analyzer to see which frequencies make it through. <\/b><\/div>\n
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I thought about building a noise generator like the one in Tony and Graham’s book, but then it occurred to me that probably had one sitting on my bench. Sure enough, a look at the manual for my cheap FeelTech function generator revealed that PRESETS 3 and 8 are noise generators. I quickly pulled out a 9 MHz filter that Dean KK4DAS had given me, put the noise into one end and the TinySA on the other end. Bob was quickly my uncle. See above. <\/b><\/div>\n

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More recently Tony G4WIF built a comb generator as a noise source: <\/b><\/div>\n
http:\/\/www.fishpool.org.uk\/combgenerator.htm<\/a><\/b><\/div>\n

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Thanks to Tony, Graham, and Dean. And to the folks who developed the TinySA. <\/b><\/div>\n

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I’ve been meaning to try this for a long time. Years ago Tony Fishpool and Graham Firth wrote about using a noise generator and a spectrum analyzer to sweep the bandpass of a filter. The idea here is to send very broadband noise into a filter, and then use a spectrum analyzer to see which … Continue reading “Using Noise to Sweep a Filter with the TinySA”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":8362,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,329,71,226],"tags":[],"class_list":["post-8361","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-filters","category-fishpool-tony","category-test-gear","category-tinysa"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8361","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=8361"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8361\/revisions"}],"predecessor-version":[{"id":8363,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8361\/revisions\/8363"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/8362"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=8361"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=8361"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=8361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}