{"id":17135,"date":"2026-05-20T20:40:33","date_gmt":"2026-05-20T15:10:33","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=17135"},"modified":"2026-05-20T20:40:48","modified_gmt":"2026-05-20T15:10:48","slug":"how-much-power-can-an-rg58-handle-into-a-2-5-sq-mm-wire-inverted-v-dipole-antenna","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/how-much-power-can-an-rg58-handle-into-a-2-5-sq-mm-wire-inverted-v-dipole-antenna\/","title":{"rendered":"How much power can an RG58 handle into a 2.5 sq mm wire inverted V dipole antenna?"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/H3wA2drKfoY?si=yWWOgTqUEZXGEy_H\" 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 short answer is that in a typical HF setup (like the 80m band) with a well-matched antenna, standard RG58 coax can safely handle <strong>400 to 500 Watts PEP<\/strong> on SSB or CW, and about <strong>150 to 200 Watts<\/strong> continuous duty (like FT8, RTTY, or AM).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, your actual power limit isn&#8217;t determined by a single static number. It depends heavily on <strong>frequency<\/strong>, <strong>SWR<\/strong>, and the <strong>duty cycle<\/strong> of your operating mode.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is exactly how the RG58, the 2.5 mm<sup>2<\/sup> wire, and the Inverted V geometry interact to define your system&#8217;s true power handling limits.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. The Bottleneck: RG58 Coaxial Cable<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In this configuration, your 2.5 mm<sup>2<\/sup> copper wire (roughly equivalent to 13 AWG) is incredibly robust. It can easily handle well over 1 to 2 kW of RF power without breaking a sweat. <strong>Your power limit is entirely dictated by the RG58 coax.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">RG58 is a thin, lossy cable with a solid or stranded center conductor and a polyethylene or foam dielectric. Its power handling is limited by <strong>thermal breakdown<\/strong>\u2014if it gets too hot, the dielectric melts, causing a short circuit.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Baseline Power Handling (at 1:1 SWR, matched load)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>3.5 MHz (80m band):<\/strong> ~800 W continuous \/ ~1500 W PEP<\/li>\n\n\n\n<li><strong>7.0 MHz (40m band):<\/strong> ~600 W continuous \/ ~1200 W PEP<\/li>\n\n\n\n<li><strong>14 MHz (20m band):<\/strong> ~400 W continuous \/ ~800 W PEP<\/li>\n\n\n\n<li><strong>28 MHz (10m band):<\/strong> ~250 W continuous \/ ~500 W PEP<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2. The Real-World Modifiers: SWR, Mode, and Geometry<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When you feed a real-world Inverted V dipole, those ideal baseline numbers drop due to three main factors:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">High SWR (Standing Wave Ratio)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An Inverted V configuration naturally lowers the feedpoint impedance from a flat dipole&#8217;s 73 \u03a9 down to roughly <strong>50 \u03a9<\/strong> (depending on the included angle of the apex, typically between 60 to 120 degrees).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While this geometry gives you an excellent natural match to 50 \u03a9 coax at resonance, moving away from your center frequency will cause the SWR to rise. When SWR increases, standing waves create voltage and current peaks along the coax line.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>The SWR Rule of Thumb:<\/strong> At an SWR of 2:1, your coax&#8217;s power handling capability drops to roughly <strong>70%<\/strong> of its rated maximum. At 3:1, it drops to <strong>50%<\/strong>.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">Mode Duty Cycle<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SSB (Voice):<\/strong> Low duty cycle (~20%). The coax has time to cool down between speech peaks. You can safely run <strong>400W PEP<\/strong> on HF.<\/li>\n\n\n\n<li><strong>CW (Morse Code):<\/strong> Moderate duty cycle (~40%). Safe up to <strong>250\u2013300W<\/strong>.<\/li>\n\n\n\n<li><strong>Digital (FT8 \/ RTTY):<\/strong> 100% duty cycle during transmission blocks. The coax is under constant thermal stress. Limit your power to <strong>100\u2013150W<\/strong> to prevent the internal dielectric from softening.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Summary of Safe Operating Limits<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If you are running a standard layout with a good match (SWR under 1.5:1) on the lower HF bands, use these guidelines:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Operating Mode<\/strong><\/td><td><strong>Safe Maximum Power for RG58<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>FT8 \/ RTTY \/ Data<\/strong><\/td><td>150 Watts<\/td><\/tr><tr><td><strong>CW (Morse)<\/strong><\/td><td>300 Watts<\/td><\/tr><tr><td><strong>SSB (Voice PEP)<\/strong><\/td><td>400 &#8211; 500 Watts<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Pro-Tips for Your Setup:<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Watch the Quality:<\/strong> High-quality RG58 (with a solid polyethylene core) handles heat significantly better than cheap, generic varieties with thin shielding or low-density foam cores.<\/li>\n\n\n\n<li><strong>Upgrade the Coax First:<\/strong> If you plan on deploying a 400W linear amplifier and pushing it to its limits swap the RG58 run for <strong>RG8X<\/strong> (Mini-8), or ideally <strong>LMR-240<\/strong> \/ <strong>RG213<\/strong>. They fit standard connectors easily but offer a massive leap in thermal headroom and lower attenuation loss.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>The short answer is that in a typical HF setup (like the 80m band) with a well-matched antenna, standard RG58 coax can safely handle 400 to 500 Watts PEP on SSB or CW, and about 150 to 200 Watts continuous duty (like FT8, RTTY, or AM). However, your actual power limit isn&#8217;t determined by a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17140,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-17135","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 v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How much power can an RG58 handle into a 2.5 sq mm wire inverted V dipole antenna? - 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\/how-much-power-can-an-rg58-handle-into-a-2-5-sq-mm-wire-inverted-v-dipole-antenna\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How much power can an RG58 handle into a 2.5 sq mm wire inverted V dipole antenna? - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"The short answer is that in a typical HF setup (like the 80m band) with a well-matched antenna, standard RG58 coax can safely handle 400 to 500 Watts PEP on SSB or CW, and about 150 to 200 Watts continuous duty (like FT8, RTTY, or AM). 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