{"id":47280,"date":"2021-01-13T09:46:54","date_gmt":"2021-01-13T13:46:54","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=47280"},"modified":"2021-01-13T09:46:54","modified_gmt":"2021-01-13T13:46:54","slug":"giuseppe-discovers-his-homebrew-rotating-ferrite-antenna-works-amazingly-indoors-and-nulls-rfi","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2021\/01\/giuseppe-discovers-his-homebrew-rotating-ferrite-antenna-works-amazingly-indoors-and-nulls-rfi\/","title":{"rendered":"Giuseppe discovers his homebrew rotating ferrite antenna works amazingly indoors and nulls RFI"},"content":{"rendered":"<p><a href=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Antenna-T-ferrite.-3-scaled-e1610543698902.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-47281\" src=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Antenna-T-ferrite.-3-scaled-e1610543698902.jpg\" alt=\"\" width=\"800\" height=\"1067\" \/><\/a><\/p>\n<p>Many thanks to SWLing Post contributor, Giuseppe Morl\u00e8, who writes:<\/p>\n<blockquote><p>Dear Thomas,<\/p>\n<p>This is Giuseppe Morl\u00e8 again. First of all, Happy New Year to you and to the whole <em>SWLing Post<\/em> community! I&#8217;ve been continuing the tests <a href=\"https:\/\/swling.com\/blog\/2021\/01\/giuseppes-homebrew-rotating-ferrite-antenna\/\">on my &#8220;<strong>T Ferrite<\/strong>&#8221; antenna<\/a> for medium wave and the 160 meters ham meter band.<\/p>\n<p>I tried the antenna inside my shack listening to Rai Radio 1 from Milan Siziano, about 800 km from me, on 900 kHz in the early morning after sunrise. The antenna, despite being inside, proved to be perfect for the cancellation of the electrical noise that I had around me.<\/p>\n<p>Disconnecting the antenna from the receiver&#8211;a Sangean ATS-909&#8211;the noise occupied everything without being able to listen to anything. Putting the antenna back, the noise disappeared completely making the modulation re-emerge, with a weak signal, it was already day, but with good understandability.<\/p>\n<p>The antenna, <a href=\"https:\/\/swling.com\/blog\/2021\/01\/giuseppes-homebrew-rotating-ferrite-antenna\/\">as I described in another article<\/a>, is composed of 2 ferrites 12 cm long each, bought at ham fests, tied together with insulating tape.<\/p>\n<p><a href=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Antenna-T-ferrite.-scaled-e1610544276162.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-47282\" src=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Antenna-T-ferrite.-scaled-e1610544276162.jpg\" alt=\"\" width=\"800\" height=\"1067\" \/><\/a><\/p>\n<p>For the two windings, I used a small section of cable used for telephone systems that is rigid enough to model perfectly on the ferrites&#8211;43 turns for the primary and 3 turns for the coupling link to the receiver. The variable capacitor is 850 pf.<\/p>\n<p><a href=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Antenna-T-ferrite.-2-scaled-e1610544289706.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-47283\" src=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Antenna-T-ferrite.-2-scaled-e1610544289706.jpg\" alt=\"\" width=\"800\" height=\"600\" \/><\/a><\/p>\n<p>I should mention that the magnificent <a href=\"https:\/\/www.youtube.com\/user\/W1VLF\" target=\"_blank\" rel=\"noopener\">W1VLF<\/a> channel was my original source of inspiration for this antenna.<\/p>\n<p>Check out the following video:<\/p><\/blockquote>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"625\" height=\"352\" src=\"https:\/\/www.youtube.com\/embed\/ZZuJ0hIIHf8?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/youtu.be\/ZZuJ0hIIHf8\">Click here to watch on YouTube.<\/a><\/p>\n<p>That is amazing, Giuseppe! We often think of magnetic loops as the only choice for coping with urban noise and RFI, but ferrite bars&#8211;especially configured like yours&#8211;are a brilliant tool for indoor low-band listening. Thank you for sharing! We love your experiments.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Many thanks to SWLing Post contributor, Giuseppe Morl\u00e8, who writes: Dear Thomas, This is Giuseppe Morl\u00e8 again. First of all, Happy New Year to you and to the whole SWLing Post community! I&#8217;ve been continuing the tests on my &#8220;T Ferrite&#8221; antenna for medium wave and the 160 meters ham meter band. I tried the [&hellip;]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3607,8,627,3],"tags":[6773,7938,9073,5895,1646,5791,4099],"class_list":["post-47280","post","type-post","status-publish","format-standard","hentry","category-antennas","category-articles","category-how-to","category-news","tag-am-antennas","tag-am-broadcast-antennas","tag-directional-dual-ferrite-antenna","tag-ferrite","tag-ferrite-antennas","tag-giuseppe-morle-iz0gzw","tag-mediumwave"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-ciA","jetpack-related-posts":[{"id":47162,"url":"https:\/\/swling.com\/blog\/2021\/01\/giuseppes-homebrew-rotating-ferrite-antenna\/","url_meta":{"origin":47280,"position":0},"title":"Giuseppe&#8217;s homebrew rotating ferrite antenna","author":"Thomas","date":"January 5, 2021","format":false,"excerpt":"Many thanks to SWLing Post contributor, Giuseppe Morl\u00e8 (IZ0GZW), who writes: Dear Thomas, I'm Giuseppe Morl\u00e8 (IZ0GZW) from Formia, on the Tyrrhenian Sea, in Italy . I built this simple rotating directive ferrite antenna for medium waves and the 160 meters ham band. Inside the tube there are 2 ferrites\u2026","rel":"","context":"In &quot;Antennas&quot;","block_context":{"text":"Antennas","link":"https:\/\/swling.com\/blog\/category\/antennas\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Double-Ferrite-Antenna-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Double-Ferrite-Antenna-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Double-Ferrite-Antenna-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/01\/Double-Ferrite-Antenna-1.jpeg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":64826,"url":"https:\/\/swling.com\/blog\/2025\/12\/giuseppes-clever-homebrew-ferrite-antenna-for-mw-and-sw-listening\/","url_meta":{"origin":47280,"position":1},"title":"Giuseppe&#8217;s Clever Homebrew Ferrite Antenna for MW and SW Listening","author":"Thomas","date":"December 7, 2025","format":false,"excerpt":"Many thanks to SWLing Post contributor, Giuseppe Morl\u00e8, who writes: Dear Thomas, I\u2019m Giuseppe Morl\u00e8, IZ0GZW, from Formia in central Italy on the Tyrrhenian Sea. This is one of my builds from a few years ago: the T Ferrite antenna. It\u2019s a minimal antenna designed mainly for mediumwave, but it\u2026","rel":"","context":"In &quot;AM&quot;","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Bar-antenna-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Bar-antenna-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Bar-antenna-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Bar-antenna-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Bar-antenna-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":53118,"url":"https:\/\/swling.com\/blog\/2022\/06\/giuseppes-latest-homemade-ferrite-antenna-for-mw-and-sw\/","url_meta":{"origin":47280,"position":2},"title":"Giuseppe&#8217;s latest homemade ferrite antenna for MW and SW","author":"Thomas","date":"June 28, 2022","format":false,"excerpt":"Many thanks to\u00a0SWLing Post\u00a0contributor,\u00a0Giuseppe Morl\u00e8 (IZ0GZW), who writes: Dear friends, I'm Giuseppe Morl\u00e8 from Formia, central Italy on the Tyrrhenian Sea. I want to share with you my latest ferrite antenna for listening; it is composed of 3 ferrites of 20 cm each in a tube for electrical systems with\u2026","rel":"","context":"In &quot;AM&quot;","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/06\/Giuseppe-Ferrite-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/06\/Giuseppe-Ferrite-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/06\/Giuseppe-Ferrite-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/06\/Giuseppe-Ferrite-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/06\/Giuseppe-Ferrite-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":58640,"url":"https:\/\/swling.com\/blog\/2024\/01\/d-i-c-a-giuseppes-latest-homebrew-portable-antenna\/","url_meta":{"origin":47280,"position":3},"title":"D.I.C.A.: Giuseppe&#8217;s latest homebrew portable antenna","author":"Thomas","date":"January 7, 2024","format":false,"excerpt":"Many thanks to SWLing Post contributor, Giuseppe Morl\u00e8, who shares the following antenna project: Dear Thomas and SWLing Post Friends , I'm Giuseppe Morl\u00e8, iz0gzw, from Central Italy, Formia on the Tyrrhenian Sea... Some time ago I had drawn this minimal HF antenna on paper... I took advantage of the\u2026","rel":"","context":"In &quot;Antennas&quot;","block_context":{"text":"Antennas","link":"https:\/\/swling.com\/blog\/category\/antennas\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/01\/Giuseppe-Antenna-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/01\/Giuseppe-Antenna-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/01\/Giuseppe-Antenna-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/01\/Giuseppe-Antenna-1.jpeg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":48622,"url":"https:\/\/swling.com\/blog\/2021\/04\/giuseppe-is-impressed-with-the-performance-of-his-homebrew-passive-loop-antenna\/","url_meta":{"origin":47280,"position":4},"title":"Giuseppe is impressed with the performance of his homebrew passive loop antenna","author":"Thomas","date":"April 22, 2021","format":false,"excerpt":"Many thanks to\u00a0SWLing Post\u00a0contributor, Giuseppe Morl\u00e8 (IZ0GZW), who shares the following: Dear Thomas, I'm Giuseppe Morl\u00e8 from central Italy, the Tyrrhenian Sea, Formia. Today I tested my noise canceling loop inside the radio station by comparing it to the crossed loops. Again, like my medium wave T Ferrite, this loop\u2026","rel":"","context":"In &quot;Accessories&quot;","block_context":{"text":"Accessories","link":"https:\/\/swling.com\/blog\/category\/accessories\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/04\/Giuseppe.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/04\/Giuseppe.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/04\/Giuseppe.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/04\/Giuseppe.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/04\/Giuseppe.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2021\/04\/Giuseppe.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":63708,"url":"https:\/\/swling.com\/blog\/2025\/08\/giuseppes-ingenious-recycled-antenna-board-for-sw-mw-listening\/","url_meta":{"origin":47280,"position":5},"title":"Giuseppe&#8217;s Ingenious Recycled Antenna Board for SW &#038; MW Listening","author":"Thomas","date":"August 21, 2025","format":false,"excerpt":"Many thanks to SWLing Post contributor Giuseppe Morl\u00e8, who writes: Dear Thomas, I\u2019m Giuseppe Morl\u00e8, IZ0GZW, from Formia, in central Italy on the Tyrrhenian Sea. I\u2019d like to show you my antenna board for shortwave and mediumwave listening with portable receivers like the Tecsun PL-660. The board has two distinct\u2026","rel":"","context":"In &quot;Antennas&quot;","block_context":{"text":"Antennas","link":"https:\/\/swling.com\/blog\/category\/antennas\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/08\/Giuseppe-Board-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/08\/Giuseppe-Board-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/08\/Giuseppe-Board-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/08\/Giuseppe-Board-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/08\/Giuseppe-Board-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/47280","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/comments?post=47280"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/47280\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=47280"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=47280"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=47280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}