{"id":825,"date":"2026-08-07T21:47:24","date_gmt":"2026-08-07T16:17:24","guid":{"rendered":"https:\/\/www.cyberaka.com\/?p=825"},"modified":"2026-08-07T21:47:26","modified_gmt":"2026-08-07T16:17:26","slug":"a-small-shortwave-adventure-without-leaving-the-browser","status":"publish","type":"post","link":"https:\/\/www.cyberaka.com\/?p=825","title":{"rendered":"A Small Shortwave Adventure, Without Leaving the Browser"},"content":{"rendered":"<style>\n    :root { color-scheme: light; --ink:#243447; --muted:#64748b; --blue:#245b85; --pale:#eef6fb; --line:#d8e2ea; --good:#eaf5ec; }\n    body { margin:0; background:#f7f9fb; color:var(--ink); font:18px\/1.7 Georgia, \"Times New Roman\", serif; }\n    article { max-width:780px; margin:40px auto; padding:clamp(24px,5vw,64px); background:#fff; box-shadow:0 8px 32px rgba(36,52,71,.08); }\n    h1, h2 { font-family:system-ui,-apple-system,\"Segoe UI\",sans-serif; line-height:1.2; color:#183f5d; }\n    h1 { margin:.2em 0 .35em; font-size:clamp(2.1rem,6vw,3.7rem); 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A few moments later, I had a live spectrum display open in my browser and was tuning a real radio receiver located hundreds of kilometres away.<\/p>\n<p>The website was the <a href=\"http:\/\/websdr.ewi.utwente.nl:8901\/\">University of Twente WebSDR<\/a>. Unlike an ordinary audio stream, this is a remotely controlled software-defined radio. I could enter a frequency, choose AM or USB, watch signals appear on the waterfall, and hear whatever the antenna in Enschede was receiving at that moment.<\/p>\n<blockquote>\n<p>The best part was the uncertainty. A frequency might contain music, speech, a mysterious mechanical sound\u2014or nothing at all.<\/p>\n<\/blockquote>\n<h2><span class=\"ez-toc-section\" id=\"First_stop_The_Buzzer\"><\/span>First stop: The Buzzer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>We started on <strong>4625 kHz USB<\/strong>, home of the famous Russian utility signal commonly called <em>UVB-76<\/em> or <em>The Buzzer<\/em>. Most of the time it produces a monotonous repeating buzz. Very occasionally, the pattern is interrupted by a spoken Russian message.<\/p>\n<p>It was an appropriately strange introduction to shortwave: less like selecting a radio station and more like opening a tiny audio window onto an unexplained corner of the world.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Finding_music_in_the_noise\"><\/span>Finding music in the noise<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Next, we moved to the broadcast bands. On <strong>6070 kHz AM<\/strong>, music and speech emerged clearly enough to make the whole experiment feel real. We tried <strong>6160 kHz<\/strong> too, but heard nothing useful. That failure was part of the fun: shortwave reception changes with time, daylight, distance, transmitter schedules, and the state of the ionosphere.<\/p>\n<p>Then came the best signal of the session: <strong>9670 kHz AM<\/strong>. My verdict was simple: <strong>9670 was the cleanest music.<\/strong> The frequency is used by <a href=\"https:\/\/www.channel292.de\/\">Channel 292<\/a>, transmitted from Rohrbach\/Waal in Bavaria, Germany. Channel 292 carries a rotating collection of independently produced music and spoken-word programmes, so the content can change throughout the day.<\/p>\n<table>\n<caption>Our listening log from the session<\/caption>\n<thead>\n<tr>\n<th>Frequency<\/th>\n<th>Mode<\/th>\n<th>What we found<\/th>\n<th>Reception<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"favorite\">\n<td>1008 kHz<\/td>\n<td>AM \/ MW<\/td>\n<td>Radio Twente Gold, Netherlands<\/td>\n<td><strong>Clear \u201cGerman Hour\u201d<\/strong><\/td>\n<\/tr>\n<tr>\n<td>4625 kHz<\/td>\n<td>USB<\/td>\n<td>UVB-76, \u201cThe Buzzer\u201d<\/td>\n<td>Distinct utility signal<\/td>\n<\/tr>\n<tr>\n<td>6070 kHz<\/td>\n<td>AM<\/td>\n<td>European music and speech<\/td>\n<td>Good<\/td>\n<\/tr>\n<tr>\n<td>6160 kHz<\/td>\n<td>AM<\/td>\n<td>Broadcast candidate<\/td>\n<td>Silent or too weak<\/td>\n<\/tr>\n<tr class=\"favorite\">\n<td>9670 kHz<\/td>\n<td>AM<\/td>\n<td>Channel 292<\/td>\n<td><strong>Clearest music<\/strong><\/td>\n<\/tr>\n<tr>\n<td>6085 kHz<\/td>\n<td>AM<\/td>\n<td>Radio Mi Amigo International<\/td>\n<td>Friday music programme<\/td>\n<\/tr>\n<tr class=\"favorite\">\n<td>7280 kHz<\/td>\n<td>AM<\/td>\n<td>Likely Radio Dynamite, Tilburg<\/td>\n<td><strong>Music; slightly disturbed<\/strong><\/td>\n<\/tr>\n<tr>\n<td>13720 kHz<\/td>\n<td>AM<\/td>\n<td>China Radio International<\/td>\n<td>Long-distance experiment<\/td>\n<\/tr>\n<tr class=\"favorite\">\n<td>27465 kHz<\/td>\n<td>AM \/ CB<\/td>\n<td>Italian \u201cCanale 45\u201d<\/td>\n<td><strong>Confirmed Italian operators<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"A_medium-wave_bonus\"><\/span>A medium-wave bonus<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Not every discovery was technically shortwave. On <strong>1008 kHz AM<\/strong>, in the medium-wave band, we clearly received Radio Twente Gold\u2019s <em>German Hour<\/em>. The station broadcasts from Hengelo in the Netherlands, very close to the WebSDR receiver. Its programming leans into radio nostalgia, including music from the 1920s through the 1940s, historic announcements, and old commercials. Radio Twente Gold\u2019s <a href=\"https:\/\/www.twentegold.nl\/en-gb\/ontvangst\">own reception guide<\/a> even recommends using the University of Twente WebSDR for that authentic medium-wave sound.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"An_Italian_CB_surprise\"><\/span>An Italian CB surprise<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>At the opposite end of the receiver\u2019s range, <strong>27465 kHz AM<\/strong>\u2014or 27.465 MHz\u2014produced another confirmed catch. The frequency is widely known among listeners as Italian <em>Canale 45<\/em> or the <em>Italian Superbowl<\/em>. It is associated with lively, often high-powered CB and freeband conversations, including Italian truck drivers and so-called \u201cbig radio\u201d operators. The signals can feature forceful modulation and conspicuous echo effects.<\/p>\n<p>This was not a scheduled broadcaster at all, but two-way radio traffic carried over an unusually good 11-metre propagation path. \u201cPirate\u201d and \u201cfreeband\u201d are common listener labels for this activity; from reception alone, we cannot determine the equipment, power, or legal status of any individual operator.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"A_quick_visit_to_China\"><\/span>A quick visit to China<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To finish, we looked for something transmitted from China. The current schedule pointed us to <strong>13720 kHz AM<\/strong>: an English-language China Radio International broadcast from Xi\u2019an. Its transmitter runs at a formidable 500 kW, but shortwave is never simply about power. The signal still has to make the long journey to the Netherlands, bouncing through the ionosphere and fading along the way.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Correcting_a_mistaken_identity\"><\/span>Correcting a mistaken identity<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A later experiment on <strong>7280 kHz AM<\/strong> taught us why a schedule is only a guide. A database lookup initially suggested a Chinese CNR1\/Firedrake signal, and our first listening guess was Radio Europe. Closer listening caught the spoken identification <strong>\u201cDynamite\u201d<\/strong>, making the most likely source Radio Dynamite from Tilburg in the Netherlands. The station\u2019s music came through with slightly disturbed reception. Because no current published schedule we found documents Radio Dynamite on 7280 kHz, the identification remains carefully qualified\u2014but the audible ID is much stronger evidence than the original database match.<\/p>\n<p>That is the peculiar magic of shortwave. The sound may be scratchy and unstable, yet it has travelled through the atmosphere from a physical transmitter somewhere else on Earth. It is not a podcast selected from a server. It is a signal caught in flight.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_try_it_yourself\"><\/span>How to try it yourself<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Open the WebSDR, enter a frequency in kilohertz, and select the appropriate mode. International broadcast stations normally use <strong>AM<\/strong>; utility and amateur voice signals often use <strong>USB<\/strong> or <strong>LSB<\/strong>. If a frequency is empty, try another one\u2014or return later. Reception can be completely different after sunset.<\/p>\n<p><a class=\"button\" href=\"http:\/\/websdr.ewi.utwente.nl:8901\/\">Open the University of Twente WebSDR<\/a><\/p>\n<p>There are also schedules such as <a href=\"https:\/\/short-wave.info\/\">Short-Wave.Info<\/a> and the <a href=\"https:\/\/new.hfcc.org\/data\/a26\/\">HFCC broadcast listings<\/a>, which help identify what should be on air at a particular UTC time.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ten_countries_for_the_next_listening_session\"><\/span>Ten countries for the next listening session<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Our first afternoon only scratched the surface. Here is a ten-country itinerary for the same receiver, based on the current A26 summer schedules. Every frequency uses <strong>AM<\/strong>. The reception rating is a practical expectation from the Netherlands\u2014not a promise\u2014because shortwave propagation can turn a strong scheduled transmission into silence.<\/p>\n<table>\n<caption>Scheduled targets valid during the A26 season; all times are UTC<\/caption>\n<thead>\n<tr>\n<th>Country<\/th>\n<th>Station and frequency<\/th>\n<th>When to try<\/th>\n<th>Why it is interesting<\/th>\n<th>From Twente<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\ud83c\udde9\ud83c\uddea Germany<\/td>\n<td><strong>Channel 292<\/strong><br \/>9670 kHz<\/td>\n<td>Programming varies throughout the day<\/td>\n<td>Independent music, oldies, specialist shows, and delightfully unpredictable radio.<\/td>\n<td>Good<\/td>\n<\/tr>\n<tr>\n<td>\ud83c\uddf7\ud83c\uddf4 Romania<\/td>\n<td><strong>Radio Romania International<\/strong><br \/>15320 kHz<\/td>\n<td>1100\u20131200 daily<br \/><small>Alternative: 15130<\/small><\/td>\n<td>English news and Romanian culture, often with folk, classical, or contemporary music.<\/td>\n<td>Good<\/td>\n<\/tr>\n<tr>\n<td>\ud83c\uddf9\ud83c\uddf7 T\u00fcrkiye<\/td>\n<td><strong>Voice of T\u00fcrkiye<\/strong><br \/>15320 kHz<\/td>\n<td>1400\u20131500 daily<\/td>\n<td>Turkish-language programming that frequently includes distinctive Turkish music.<\/td>\n<td>Good<\/td>\n<\/tr>\n<tr>\n<td>\ud83c\uddea\ud83c\uddf8 Spain<\/td>\n<td><strong>Radio Exterior de Espa\u00f1a<\/strong><br \/>17715 kHz<\/td>\n<td>1400\u20132200 Mon\u2013Fri<\/td>\n<td>Spanish news, sport, culture, and music from a 200 kW transmitter at Noblejas.<\/td>\n<td>Fair<\/td>\n<\/tr>\n<tr>\n<td>\ud83c\udde8\ud83c\uddf3 China<\/td>\n<td><strong>China Radio International<\/strong><br \/>9535 kHz<\/td>\n<td>1600\u20131800 daily<\/td>\n<td>A German-language service sent from Baoji toward Europe\u2014China heard through an unexpected linguistic lens.<\/td>\n<td>Fair\u2013good<\/td>\n<\/tr>\n<tr>\n<td>\ud83c\uddf0\ud83c\uddf7 South Korea<\/td>\n<td><strong>KBS World Radio<\/strong><br \/>9785 kHz<\/td>\n<td>1400\u20131600 daily<\/td>\n<td>English programmes from Seoul, with Korean current affairs, culture, and K-pop features.<\/td>\n<td>DX challenge<\/td>\n<\/tr>\n<tr>\n<td>\ud83c\uddf0\ud83c\uddf5 North Korea<\/td>\n<td><strong>Voice of Korea<\/strong><br \/>13760 kHz<\/td>\n<td>1300\u20131357 daily<\/td>\n<td>English broadcasts to Europe, usually opening with an unmistakable interval signal and highly formal presentation.<\/td>\n<td>Fair<\/td>\n<\/tr>\n<tr>\n<td>\ud83c\uddfb\ud83c\uddf3 Vietnam<\/td>\n<td><strong>Voice of Vietnam<\/strong><br \/>9835 kHz<\/td>\n<td>Try 1900\u20131930 daily<\/td>\n<td>English news and cultural features; weekend editions can include contemporary Vietnamese music.<\/td>\n<td>Fair\u2013good<\/td>\n<\/tr>\n<tr>\n<td>\ud83c\udde9\ud83c\uddff Algeria<\/td>\n<td><strong>Ifrikya FM<\/strong><br \/>15140 kHz<\/td>\n<td>0700\u20131900 daily<\/td>\n<td>A pan-African mix of Arabic presentation, news, and regional music from a powerful Algerian transmitter.<\/td>\n<td>Fair<\/td>\n<\/tr>\n<tr>\n<td>\ud83c\uddee\ud83c\uddf3 India<\/td>\n<td><strong>Akashvani External Service<\/strong><br \/>9620 kHz<\/td>\n<td>1730\u20131930 daily<br \/><small>English \u201cSpotlight\u201d around 1835<\/small><\/td>\n<td>Arabic service from Bengaluru with a short English feature\u2014and the possibility of Indian music between spoken segments.<\/td>\n<td>DX challenge<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote>\n<p><strong>Live test, 7 August 2026 at about 11:00 UTC:<\/strong> all ten itinerary frequencies were tuned successfully on the Twente receiver. Channel 292 on 9670 kHz was clearly received. Radio Romania International on 15320 kHz produced no useful reception. Ifrikya FM on 15140 kHz carried a weak voice signal that needed synchronous AM and a wider filter to improve intelligibility. A separate test of 7280 kHz carried music with slightly disturbed reception and an audible \u201cDynamite\u201d identification, pointing to Radio Dynamite in Tilburg. The remaining services were outside their listed broadcast windows, so any signal on those frequencies could not be honestly attributed to the named station. They remain targets for timed follow-up listening.<\/p>\n<\/blockquote>\n<p>These targets come from broadcaster notices and the coordinated A26 listings: <a href=\"https:\/\/www.rri.ro\/en\/useful-information-en\/how-to-listen\/rri-2026-summer-broadcast-frequencies-id998593.html\">Radio Romania International<\/a>, <a href=\"https:\/\/world.kbs.co.kr\/service\/about_notice_view.htm?lang=e&amp;no=49830\">KBS World Radio<\/a>, <a href=\"https:\/\/vovworld.vn\/about-us\/vov-shortwave-frequency-to-europe-to-change-from-june-1-2438696.vov5\">Voice of Vietnam<\/a>, <a href=\"https:\/\/prasarbharati.gov.in\/wp-content\/uploads\/2026\/03\/External-Services-29.03.2026-.pdf\">Akashvani<\/a>, and the <a href=\"https:\/\/new.hfcc.org\/data\/a26\/\">HFCC A26 database<\/a>. Frequencies and programmes may change, so it is worth checking the schedule again before tuning.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_surprised_me\"><\/span>What surprised me<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>I expected an online radio directory. What I found was much more tactile: a shared scientific instrument, a live waterfall of signals, and the small thrill of not knowing what the next frequency would contain. In less than an hour we encountered a mysterious Russian buzzer, music from Germany, an empty patch of spectrum, and a broadcast from China.<\/p>\n<p>It felt less like browsing the web and more like turning a dial across the world.<\/p>\n<footer class=\"note\">\n<p><strong>Listening note:<\/strong> Frequencies are shared and schedules change. A station heard on a particular frequency today may be absent\u2014or replaced by another broadcaster\u2014at a different time. All broadcast times are normally listed in UTC.<\/p>\n<\/footer>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>A browser-based journey through shortwave radio\u2014from clear music on 9670 kHz to Dutch pirates, CB chatter, and mysterious digital signals.<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[96,94,93],"class_list":["post-825","post","type-post","status-publish","format-standard","hentry","category-miscellaneous","tag-internet-radio","tag-shortwave-radio","tag-websdr"],"_links":{"self":[{"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=\/wp\/v2\/posts\/825","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=825"}],"version-history":[{"count":1,"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=\/wp\/v2\/posts\/825\/revisions"}],"predecessor-version":[{"id":826,"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=\/wp\/v2\/posts\/825\/revisions\/826"}],"wp:attachment":[{"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=825"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=825"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cyberaka.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=825"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}