{"id":16122,"date":"2025-12-14T14:50:38","date_gmt":"2025-12-14T09:20:38","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16122"},"modified":"2025-12-14T14:50:40","modified_gmt":"2025-12-14T09:20:40","slug":"tell-me-length-of-inverted-v-antenna-for-7135-khz-using-2-5-sq-mm-insulated-copper-wire-used-for-home-wiring","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/tell-me-length-of-inverted-v-antenna-for-7135-khz-using-2-5-sq-mm-insulated-copper-wire-used-for-home-wiring\/","title":{"rendered":"Tell me length of inverted V antenna for 7135 kHz using 2.5 sq mm insulated copper wire used for home wiring"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/UJx7EjGbdOY?si=Z0CFXmQh_kPT1E3S\" 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\">That&#8217;s a great question for an amateur radio operator! The length of a half-wave dipole antenna (which is what an inverted V is based on) is primarily determined by the <strong>frequency<\/strong> and the <strong>velocity factor<\/strong> of the wire.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For your specific antenna design:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Frequency (<em>f<\/em>):<\/strong> 7135 kHz (or 7.135 MHz)<\/li>\n\n\n\n<li><strong>Wire:<\/strong> 2.5 sq mm insulated copper wire (likely PVC or similar insulation)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">1. Velocity Factor (VF) Estimation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The insulation on the copper wire slows down the radio wave, which is accounted for by the velocity factor (VF).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>For <strong>bare copper wire<\/strong>, the VF is very close to 1.0 (or about 0.95-0.98).<\/li>\n\n\n\n<li>For <strong>PVC-insulated hook-up or house wire<\/strong>, the VF is typically lower, often falling in the range of <strong>0.93 to 0.97<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">I will use a standard conservative value of <strong>VF = 0.95<\/strong> for insulated wire for this calculation. You may need to fine-tune this by trimming the antenna once it&#8217;s installed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Full Dipole Length Calculation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The formula for the total physical length of a half-wave dipole antenna in feet is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L (in feet) = 468\/f (in MHz) * VF<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And in meters:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L (in meters) = 142.5\/f (in MHz) * VF<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Calculation:<\/h4>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Use the formula in meters: f (in MHz) = 7.135 MHz; VF ~ 0.95<\/li>\n\n\n\n<li>L (in meters) = 142.5\/7.135 * 0.95<\/li>\n\n\n\n<li>L (in meters) ~ 19.97 * 0.95<\/li>\n\n\n\n<li>L (in meters) ~ 18.97 meters<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">3. Inverted V Leg Length<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An inverted V antenna is a half-wave dipole bent at the center. The total length is the same as a horizontal dipole, but it&#8217;s typically cut into two equal halves (legs).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Total Antenna Length:<\/strong> 18.97 meters<\/li>\n\n\n\n<li><strong>Length of Each Leg:<\/strong> L(leg) = 18.97 meters\/2 ~ 9.485 meters<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion and Next Steps<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The required length for a half-wave inverted V antenna at 7135 kHz, using insulated copper wire with an estimated velocity factor of 0.95, is:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Total Wire Length:<\/strong> <strong>18.97 meters<\/strong><\/li>\n\n\n\n<li><strong>Length of Each Leg:<\/strong> <strong>9.485 meters<\/strong><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u26a0\ufe0f <strong>Important Antenna Tuning Note<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The calculated length is a great starting point, but the <strong>final, most accurate length<\/strong> is determined by your specific environment (height above ground, surrounding objects, type of insulation, etc.).<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Cut the wire slightly longer<\/strong> than the calculated length (e.g., 19.5 meters total, or 9.75 meters per leg.<\/li>\n\n\n\n<li>Install the inverted V.<\/li>\n\n\n\n<li>Use an Antenna Analyzer or SWR meter at the feed point to check the <strong>Standing Wave Ratio (SWR)<\/strong> on 7135 kHz.<\/li>\n\n\n\n<li><strong>Gradually trim<\/strong> equal lengths off <em>each end<\/em> of the antenna legs until the lowest SWR is achieved near your desired frequency 7135 kHz.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">I made this antenna as described and mounted it in inverted V fashion with apex at about 10m from the ground and ends about 3m from the ground. Checked the SWR in my FT-710 radio and got SWR of near 1:1 on 7135 kHz. SWR was near 1:1 down up to 7100 kHz<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SWR on 7190 kHz was also near 1:1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At lower end of the 40m band it was around 2:1. That is tunable with auto-tuner in the radio. So I did not go for any trimming.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>That&#8217;s a great question for an amateur radio operator! The length of a half-wave dipole antenna (which is what an inverted V is based on) is primarily determined by the frequency and the velocity factor of the wire. For your specific antenna design: 1. Velocity Factor (VF) Estimation The insulation on the copper wire slows [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16125,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16122","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>Tell me length of inverted V antenna for 7135 kHz using 2.5 sq mm insulated copper wire used for home wiring - 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\/tell-me-length-of-inverted-v-antenna-for-7135-khz-using-2-5-sq-mm-insulated-copper-wire-used-for-home-wiring\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tell me length of inverted V antenna for 7135 kHz using 2.5 sq mm insulated copper wire used for home wiring - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"That&#8217;s a great question for an amateur radio operator! 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