{"id":17368,"date":"2016-02-17T08:00:13","date_gmt":"2016-02-17T12:00:13","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=17368"},"modified":"2016-02-14T07:56:26","modified_gmt":"2016-02-14T11:56:26","slug":"a-simple-homebrew-high-pass-filter","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2016\/02\/a-simple-homebrew-high-pass-filter\/","title":{"rendered":"A simple homebrew high pass filter"},"content":{"rendered":"

\"12744054_901043640014242_2651293633303686752_n\"<\/a>Many thanks to Jon Hudson, of SDRplay<\/a>, who posted the image above along with the following note on Facebook:<\/p>\n

David, WA7JHZ has designed and assembled this neat 2.6 MHz high-pass filter (HPF) for use with SDRs. He says that this simple input band-pass filter (BPF) might be of interest to anyone suffering from strong AM broadcast stations that are causing overloads…..David suffers from three nearby AM radio broadcast stations that overload the front ends of several of his receivers, including the SDRplay RSP and this is an ideal, low cost solution. He built this circuit from junk parts and commented that Amidon T44-2 iron powder cores would have made a better design, but that he decided to keep costs down with this design.<\/p>\n

This design is simple enough for almost anyone to build and could help your receiver’s front end from overloading. Many thanks to David for the design\/schematic and to Jon for sharing!<\/p>\n","protected":false},"excerpt":{"rendered":"

Many thanks to Jon Hudson, of SDRplay, who posted the image above along with the following note on Facebook: David, WA7JHZ has designed and assembled this neat 2.6 MHz high-pass filter (HPF) for use with SDRs. He says that this simple input band-pass filter (BPF) might be of interest to anyone suffering from strong AM […]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"open","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":[4199,627,3,43,158],"tags":[4752,4751,4358,4105,157,4087],"class_list":["post-17368","post","type-post","status-publish","format-standard","hentry","category-accessories","category-how-to","category-news","category-shortwave-radio","category-software-defined-radio","tag-filters","tag-high-pass-filter","tag-homebrew","tag-how-to","tag-sdr","tag-software-defined-radio"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-4w8","jetpack-related-posts":[{"id":24218,"url":"https:\/\/swling.com\/blog\/2017\/02\/fm-notch-filter-for-sdrplay-rsp1\/","url_meta":{"origin":17368,"position":0},"title":"FM Notch Filter for SDRPlay RSP1","author":"Mehdi Asgari","date":"February 16, 2017","format":false,"excerpt":"RF filters are used (as the name implies) to filter\/remove the frequencies you are not interested in and\/or let frequencies you want pass . They come in lots of types. For example a band-pass filter lets the signals in a frequency range to pass through it and rejects\/attenuates other frequencies.\u2026","rel":"","context":"In "Accessories"","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\/2015\/07\/SDPlay-RSP.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/07\/SDPlay-RSP.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/07\/SDPlay-RSP.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":17502,"url":"https:\/\/swling.com\/blog\/2016\/02\/mikes-low-and-high-pass-filter-deals\/","url_meta":{"origin":17368,"position":1},"title":"Mike’s low and high pass filter deals","author":"Thomas","date":"February 27, 2016","format":false,"excerpt":"SWLing Post contributor, Mike Ladd, is an avid SDR enthusiast and an\u00a0administrator of the SDRplay Facebook group.\u00a0Mike\u00a0contacted me about special pricing he has arranged for low and high pass filters through Rescue Electronics. Mike explains: These filters retail for $70.00 each. I spoke to the builder. I told him who\u2026","rel":"","context":"In "Accessories"","block_context":{"text":"Accessories","link":"https:\/\/swling.com\/blog\/category\/accessories\/"},"img":{"alt_text":"HDSDR-SDRPlay-RSP-PARI","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/10\/HDSDR-SDRPlay-RSP-PARI-1024x554.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/10\/HDSDR-SDRPlay-RSP-PARI-1024x554.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/10\/HDSDR-SDRPlay-RSP-PARI-1024x554.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":17457,"url":"https:\/\/swling.com\/blog\/2016\/02\/sdrplay-rsp-update-includes-broadcast-id\/","url_meta":{"origin":17368,"position":2},"title":"SDRplay RSP update includes broadcast ID","author":"Thomas","date":"February 25, 2016","format":false,"excerpt":"Many thanks to Jon Hudson at SDRplay who shares the following news: The latest EXTIO control file (Version 3.8.1) has a very cool new feature for shortwave listeners interested in hunting HF DX stations. Using the world-wide station list mintained by http:\/\/www.eibispace.de\/ you can see the name of stations appear\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"The SDRplay RSP software defined radio","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/07\/SDRPlay-RSP-1.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/07\/SDRPlay-RSP-1.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/07\/SDRPlay-RSP-1.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":61594,"url":"https:\/\/swling.com\/blog\/2025\/01\/hf-signal-enhancer-for-sdr-a-hands-on-build-by-steve-allen-kz4tn\/","url_meta":{"origin":17368,"position":3},"title":"HF Signal Enhancer for SDR: A Hands-On Build by Steve Allen (KZ4TN)","author":"Thomas","date":"January 11, 2025","format":false,"excerpt":"Many thanks to SWLing Post contributor Steve Allen (KZ4TN), who shares the following guest post: SDR Signal Enhancer by Steve Allen I came across this HF Signal Enhancer for SDR on the RTL-SDR.com website. It was designed and built by Peter Parker, VK3YE from Melbourne, Australia. Below is the link\u2026","rel":"","context":"In "Articles"","block_context":{"text":"Articles","link":"https:\/\/swling.com\/blog\/category\/articles\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/01\/STEVE-HEADER-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/01\/STEVE-HEADER-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/01\/STEVE-HEADER-1.jpeg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":19541,"url":"https:\/\/swling.com\/blog\/2016\/06\/sdruno-sdrplay-introduces-a-free-native-app-for-the-rsp\/","url_meta":{"origin":17368,"position":4},"title":"SDRuno: SDRplay introduces a free native app for the RSP","author":"Thomas","date":"June 19, 2016","format":false,"excerpt":"(Source: SDRplay Press Release) SDRplay is pleased to announce the official release of SDRuno for the RSP. SDRuno is the new name for the RSP compatible version of Studio1, the rights to which we obtained and announced on 28th April. SDRuno contains native support for the SDRplay RSP and no\u2026","rel":"","context":"In "Ham Radio"","block_context":{"text":"Ham Radio","link":"https:\/\/swling.com\/blog\/category\/ham-radio\/"},"img":{"alt_text":"SDRplay-Logo","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/04\/SDRplay-Logo.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/04\/SDRplay-Logo.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/04\/SDRplay-Logo.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":43608,"url":"https:\/\/swling.com\/blog\/2020\/05\/christophs-homebrew-custom-hotkey-pad-for-sdr-applications\/","url_meta":{"origin":17368,"position":5},"title":"Christoph’s homebrew custom hotkey pad for SDR applications","author":"Thomas","date":"May 29, 2020","format":false,"excerpt":"Last week, I saw a fascinating post by Christoph Jahn on the SDRplay Facebook page. Christoph created a custom hotkey pad for use with SDRuno.\u00a0 The project is actually quite simple and his finished product looks amazing: The steps involve downloading \"LuaMacros\" a freeware macros utility that allows you to\u2026","rel":"","context":"In "Accessories"","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\/2020\/05\/SDRuno-Keypad.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/05\/SDRuno-Keypad.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/05\/SDRuno-Keypad.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/05\/SDRuno-Keypad.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2020\/05\/SDRuno-Keypad.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/17368","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=17368"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/17368\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=17368"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=17368"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=17368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}