--- title: Get Your Monitor Transmitting VHF With A Browser Tool description: A browser-based tool built by developer Efe exploits pixel clock timing on monitor connections (HDMI/DisplayPort) to generate spurious VHF transmissions,... canonical: https://daily.dev/posts/get-your-monitor-transmitting-vhf-with-a-browser-tool-remb8k42s twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Get Your Monitor Transmitting VHF With A Browser Tool | daily.dev og:description: A browser-based tool built by developer Efe exploits pixel clock timing on monitor connections (HDMI/DisplayPort) to generate spurious VHF transmissions,... og:url: https://daily.dev/posts/get-your-monitor-transmitting-vhf-with-a-browser-tool-remb8k42s og:image: https://api.daily.dev/og/posts/ReMB8k42S.png og:image:alt: Get Your Monitor Transmitting VHF With A Browser Tool og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Get Your Monitor Transmitting VHF With A Browser Tool **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary A browser-based tool built by developer Efe exploits pixel clock timing on monitor connections (HDMI/DisplayPort) to generate spurious VHF transmissions, effectively turning a computer monitor into a crude radio transmitter capable of sending Morse code. The technique relies on multiplying horizontal resolution, vertical resolution, and refresh rate (accounting for blanking intervals) to calculate the resulting frequency—for example, 1080p at 60Hz produces a signal at 148.500 MHz. The tool is available to test directly in a browser, though transmitting on unlicensed VHF bands is technically against regulations even at this weak signal strength. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do you calculate the VHF frequency generated by a monitor's pixel clock leakage? Multiply the horizontal resolution by the vertical resolution by the refresh rate, accounting for blanking intervals defined by the video timing standard. For a 1080p screen at 60Hz using CEA-861 timing, the effective horizontal and vertical resolutions become 2200 and 1125 respectively, and multiplying by 60Hz produces a signal at 148.500 MHz. _Hardware tinkerers exploring signal leakage tricks like this can find similar hacking projects curated on daily.dev._ ### Is it legal to intentionally transmit VHF signals using a monitor's pixel clock without a radio license? No, intentionally transmitting on radio bands without the appropriate license is not permitted, even if the signal is extremely weak and unlikely to be noticed, as is the case with this monitor-based Morse code transmission technique using HDMI or DisplayPort pixel clock manipulation. _Curious hobbyists weighing legal and technical tradeoffs of hardware hacks can follow similar projects on daily.dev._ ## Similar posts on daily.dev - [Analog Video From An 8-Bit Microcontroller](https://daily.dev/posts/analog-video-from-an-8-bit-microcontroller-a5lgpcwfn) · Hackaday · 0 upvotes · 0 comments - [A TV Transmitter From An STM32](https://daily.dev/posts/a-tv-transmitter-from-an-stm32-pd6jausvj) · Hackaday · 0 upvotes · 0 comments --- Tags: [#hardware](https://daily.dev/tags/hardware) [View this post on daily.dev](https://daily.dev/posts/get-your-monitor-transmitting-vhf-with-a-browser-tool-remb8k42s) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Get Your Monitor Transmitting VHF With A Browser Tool","url":"https://daily.dev/posts/get-your-monitor-transmitting-vhf-with-a-browser-tool-remb8k42s","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/get-your-monitor-transmitting-vhf-with-a-browser-tool-remb8k42s"},"datePublished":"2026-08-31T02:15:08.192Z","dateModified":"2026-08-31T02:15:31.350Z","description":"A browser-based tool built by developer Efe exploits pixel clock timing on monitor connections (HDMI/DisplayPort) to generate spurious VHF transmissions,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/6a8f2c9f6d4aa8fa12c8f4a09df94f9b?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/6a8f2c9f6d4aa8fa12c8f4a09df94f9b?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hackaday","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hackaday","logo":"https://media.daily.dev/image/upload/s--JhDfhy70--/f_auto,q_auto/v1767541814/logos/hackaday","url":"https://daily.dev/sources/hackaday"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/get-your-monitor-transmitting-vhf-with-a-browser-tool-remb8k42s","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"hardware","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hackaday","item":"https://daily.dev/sources/hackaday"},{"@type":"ListItem","position":3,"name":"Get Your Monitor Transmitting VHF With A Browser Tool"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/get-your-monitor-transmitting-vhf-with-a-browser-tool-remb8k42s#faq","mainEntity":[{"@type":"Question","name":"How do you calculate the VHF frequency generated by a monitor's pixel clock leakage?","acceptedAnswer":{"@type":"Answer","text":"Multiply the horizontal resolution by the vertical resolution by the refresh rate, accounting for blanking intervals defined by the video timing standard. For a 1080p screen at 60Hz using CEA-861 timing, the effective horizontal and vertical resolutions become 2200 and 1125 respectively, and multiplying by 60Hz produces a signal at 148.500 MHz. Hardware tinkerers exploring signal leakage tricks like this can find similar hacking projects curated on daily.dev."}},{"@type":"Question","name":"Is it legal to intentionally transmit VHF signals using a monitor's pixel clock without a radio license?","acceptedAnswer":{"@type":"Answer","text":"No, intentionally transmitting on radio bands without the appropriate license is not permitted, even if the signal is extremely weak and unlikely to be noticed, as is the case with this monitor-based Morse code transmission technique using HDMI or DisplayPort pixel clock manipulation. Curious hobbyists weighing legal and technical tradeoffs of hardware hacks can follow similar projects on daily.dev."}}]} ```