{"id":18142,"date":"2026-10-14T16:47:33","date_gmt":"2026-10-14T11:17:33","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=18142"},"modified":"2026-10-14T16:47:35","modified_gmt":"2026-10-14T11:17:35","slug":"learning-about-lmr-sdr-v1-7-15-watt","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/learning-about-lmr-sdr-v1-7-15-watt\/","title":{"rendered":"Learning About LMR SDR V1.7 15 Watt"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/SuaxZjV9RfA?si=_nXYIClfMCTYizgW\" 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\">The LMR SDR V1.7 is a multiband software-defined transceiver designed by YE3CIF. Its major upgrade from earlier iterations is the integration of a 15-watt power amplifier directly onto the main board, eliminating the need for separate exciter and PA modules.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here are the technical highlights of the V1.7 design:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Final Stage:<\/strong> It uses two RD15HVF1 MOSFETs to deliver a steady 15 to 20 watts of RF output evenly across all bands.<\/li>\n\n\n\n<li><strong>Bias and Idle Current:<\/strong> The bias voltage at the transistor gates is tuned to approximately <strong>4 Volts<\/strong>. This establishes an idle current of around <strong>500mA<\/strong> to maintain linear operation. <\/li>\n\n\n\n<li><strong>RF Transformer:<\/strong>To achieve this power, the later revisions (late 2023) swapped the older bifilar transformer for a trifilar design, specifically winding 4-10 turns of 0.5mm enameled wire on a 10mm toroid core. This change was implemented to ensure the 15 to 20-watt output remains consistent across all HF bands.<\/li>\n\n\n\n<li><strong>Software &amp; Firmware:<\/strong>The STM32 microcontroller firmware remains identical to version 1.6, and the radio continues to interface seamlessly with PowerSDR.<\/li>\n\n\n\n<li><strong>Enclosure:<\/strong>The PCB dimensions were specifically calculated to drop directly into standard commercial aluminum project boxes, meaning the front and rear panels just need standard drilling.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">With 15 watts of baseline output, this board provides more than enough drive power to directly key up a larger 100W linear amplifier\u2014such as a VU2EVQ design\u2014completely bypassing the need to homebrew an intermediate QRP driver stage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The official <strong>Bill of Materials (BOM) and component lists for the LMR SDR Version 1.7<\/strong> are available for download on the <a href=\"https:\/\/files.orarimalangraya.com\/download\/bom-lmr-sdr-v1-7-15watt\" target=\"_blank\" rel=\"noopener\">ORARI Malang Raya LMR SDR v1.7 BOM Archive<\/a>. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Complete Layout &amp; Component Guides:<\/strong> You can access structured, itemized part layouts from the developer&#8217;s community portal on the <a href=\"https:\/\/www.scribd.com\/document\/1047125088\/BOM-LMR-SDR-V1-7-2\" target=\"_blank\" rel=\"noopener\">Scribd LMR SDR V1.7 BOM Document<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Full Device Schematic:<\/strong> If you prefer tracing the circuit layout manually while sourcing parts, download the full blueprint at the <a href=\"https:\/\/www.scribd.com\/document\/878951924\/Schematic-LMR-SDR-V-1-7-june-2024-2024-11-29-1\" target=\"_blank\" rel=\"noopener\">Scribd LMR SDR V1.7 Schematic Design Sheet<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Components to Highlight<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Section<\/th><th>Key Components \/ ICs<\/th><th>Purpose<\/th><\/tr><tr><td><strong>Main Processing<\/strong><\/td><td><code>STM32F103C8T6<\/code> (Bluepill Module)<\/td><td>Acts as the core microcontroller system logic.<\/td><\/tr><tr><td><strong>Frequency Synthesizer<\/strong><\/td><td><code>Si5351A-B-GT<\/code> + <code>27.000 MHz TCXO<\/code><\/td><td>Manages stable clock generation and variable frequency control (VFO\/BFO).<\/td><\/tr><tr><td><strong>Power Amplifier<\/strong><\/td><td>2x <code>RD15HVF1<\/code> (or <code>RD16HHF1<\/code>) RF Transistors<\/td><td>Delivers the integrated 15-watt linear transmission output.<\/td><\/tr><tr><td><strong>Mixer &amp; Switches<\/strong><\/td><td><code>FST3253MX<\/code> Bus Multiplexer<\/td><td>Drives high-speed QSD\/QSE processing for RX\/TX mixing.<\/td><\/tr><tr><td><strong>Audio Processing<\/strong><\/td><td><code>NE5532<\/code> &amp; <code>TL084IDR<\/code> Operational Amplifiers<\/td><td>Amplifies baseband input and line-level audio outputs.<\/td><\/tr><tr><td><strong>Voltage Regulation<\/strong><\/td><td><code>AMS1117-5.0<\/code>, <code>AMS1117-3.3<\/code>, and <code>7812<\/code><\/td><td>Step downs power rails smoothly across 13.8V input.<\/td><\/tr><tr><td><strong>Toroids &amp; Chokes<\/strong><\/td><td><code>BN43-3312<\/code> (for linear output transformer)<\/td><td>Crucial for winding custom RF inductors and transformers.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The LMR SDR V1.7 is a multiband software-defined transceiver designed by YE3CIF. Its major upgrade from earlier iterations is the integration of a 15-watt power amplifier directly onto the main board, eliminating the need for separate exciter and PA modules. Here are the technical highlights of the V1.7 design: With 15 watts of baseline output, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":18146,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-18142","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 v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Learning About LMR SDR V1.7 15 Watt - 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\/learning-about-lmr-sdr-v1-7-15-watt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Learning About LMR SDR V1.7 15 Watt - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"The LMR SDR V1.7 is a multiband software-defined transceiver designed by YE3CIF. 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