{"id":14705,"date":"2025-07-02T05:44:29","date_gmt":"2025-07-02T00:14:29","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=14705"},"modified":"2025-07-02T05:44:31","modified_gmt":"2025-07-02T00:14:31","slug":"heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time\/","title":{"rendered":"Heard VU2TUM on RS-44 CW using RTL-SDR for the first time!"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/UmDwCWSCxaw?si=gn-ExxIwSygbaTjI\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">Heard VU2TUM on RS-44 CW using RTL-SDR for the first time, with just a CP22E VHF antenna, working on UHF as third harmonic resonance! Learned that one has to disable Gpredict tracking to hear the signal! Then click on waterfall to tune. Otherwise, Gpredict will shift back to the set frequency +\/- Doppler soon after your click on the waterfall signal!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Heard VU2TUM on RS-44 CW using RTL-SDR for the first time, with just a CP22E VHF antenna, working on UHF as third harmonic resonance! Learned that one has to disable Gpredict tracking to hear the signal! Then click on waterfall to tune. Otherwise, Gpredict will shift back to the set frequency +\/- Doppler soon after [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":14706,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-14705","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Heard VU2TUM on RS-44 CW using RTL-SDR for the first time! - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Heard VU2TUM on RS-44 CW using RTL-SDR for the first time! - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"Heard VU2TUM on RS-44 CW using RTL-SDR for the first time, with just a CP22E VHF antenna, working on UHF as third harmonic resonance! Learned that one has to disable Gpredict tracking to hear the signal! Then click on waterfall to tune. Otherwise, Gpredict will shift back to the set frequency +\/- Doppler soon after [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/techworld\/heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time\/\" \/>\n<meta property=\"og:site_name\" content=\"Johnson&#039;s Techworld\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-02T00:14:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-02T00:14:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2025\/07\/Heard-VU2TUM-on-RS-44-CW-using-RTL-SDR-for-the-first-time.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"676\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"headline\":\"Heard VU2TUM on RS-44 CW using RTL-SDR for the first time!\",\"datePublished\":\"2025-07-02T00:14:29+00:00\",\"dateModified\":\"2025-07-02T00:14:31+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time\\\/\"},\"wordCount\":75,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/wp-content\\\/uploads\\\/2025\\\/07\\\/Heard-VU2TUM-on-RS-44-CW-using-RTL-SDR-for-the-first-time.jpg\",\"articleSection\":[\"Amateur Radio (Ham Radio)\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/heard-vu2tum-on-rs-44-cw-using-rtl-sdr-for-the-first-time\\\/\",\"name\":\"Heard VU2TUM on RS-44 CW using RTL-SDR for the first time! 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