{"id":17174,"date":"2026-05-26T21:29:27","date_gmt":"2026-05-26T15:59:27","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=17174"},"modified":"2026-05-26T21:29:28","modified_gmt":"2026-05-26T15:59:28","slug":"what-is-a-helical-antenna-2","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/what-is-a-helical-antenna-2\/","title":{"rendered":"What is a Helical Antenna?"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/vMfPfnvE_Ik?si=SCVgVjZTQDwSA_bT\" 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\">A helical antenna is a specialized type of radio frequency antenna where the conducting wire is wound into the shape of a coil or helix, typically mounted over a flat reflecting ground plane. What makes the helical antenna unique is its versatility; its electrical behavior changes drastically depending on the physical size of the coil relative to the wavelength of the signal it is handling. It operates in two primary, completely distinct modes:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Normal Mode (Broadside)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In this mode, the dimensions of the helix (the diameter and the pitch between turns) are very small compared to the wavelength of the operating frequency.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Radiation Pattern:<\/strong> The antenna radiates perpendicular to the axis of the coil, similar to a standard dipole or monopole.<\/li>\n\n\n\n<li><strong>Polarization:<\/strong> Linear.<\/li>\n\n\n\n<li><strong>Practical Use:<\/strong> This design is used to drastically reduce the physical size of an antenna while maintaining electrical resonance. It is the core concept behind the &#8220;rubber ducky&#8221; antennas on handheld transceivers. In HF applications, winding a wire spirally around a fiberglass mast is a highly effective way to build a shortened vertical whip for lower frequency bands like 80m or 160m. It allows you to fit a resonant antenna into a much smaller physical footprint, though the trade-off is a significantly narrower bandwidth and lower radiation efficiency compared to a full-sized wire element.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Axial Mode (End-Fire)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In this mode, the circumference of the coil is roughly equal to one full wavelength, and the spacing between each turn is roughly a quarter of a wavelength.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Radiation Pattern:<\/strong> The antenna acts directionally, firing a beam of radio frequency energy straight down the axis of the coil, like a flashlight.<\/li>\n\n\n\n<li><strong>Polarization:<\/strong> Circular. The wave rotates as it travels, either right-handed or left-handed, matching the direction the wire is wound.<\/li>\n\n\n\n<li><strong>Practical Use:<\/strong> This mode is exceptional for space and satellite communications. When communicating with tumbling Low Earth Orbit (LEO) satellites or penetrating the ionosphere, signals suffer from Faraday rotation\u2014meaning the polarization angle of the signal twists unpredictably. If you use a linearly polarized antenna (like a standard Yagi), you will experience severe fading when the signals cross-polarize. A circularly polarized axial helical antenna completely mitigates this fading, making it a powerhouse for reliable satellite links.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Designing a helical antenna for the 160m band (the &#8220;Top Band,&#8221; from 1.8 to 2.0 MHz) means you are building a <strong>Normal-Mode Helical Antenna<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A full-sized quarter-wave vertical for 160m requires a staggering 40 meters (130 feet) of physical height. Winding the wire as a continuous coil around a non-conductive mast essentially creates a continuously loaded vertical whip. This compresses the necessary electrical length into a physically manageable size, making it a highly practical homebrew project for constrained spaces.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Design Considerations for 160m:<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>The Former (Mast):<\/strong> You will need a sturdy, RF-transparent material. Heavy-duty PVC pipe (2-inch or 3-inch diameter) or a fiberglass mast are the best choices. The larger the diameter of the former, the wider the operational bandwidth will be.<\/li>\n\n\n\n<li><strong>The Wire:<\/strong> Enamel-coated copper wire (magnet wire) or standard insulated house wire works well. For a 160m transmitting antenna handling 100W, 14 AWG (nearest to 2.5 sq mm wire) or 12 AWG wire is recommended to minimize resistive losses in the coil.<\/li>\n\n\n\n<li><strong>The Ground System (Critical):<\/strong> Because this is a highly shortened antenna, the radiation resistance at the feedpoint will be exceedingly low (often under 5 ohms). If your ground resistance is high, your transmit power will heat the dirt instead of radiating into the air. An extensive system of radials laid on or under the ground is absolutely mandatory for this antenna to be effective.<\/li>\n\n\n\n<li><strong>Impedance Matching:<\/strong> The feedpoint will not be 50 ohms. You will likely need an L-network matching unit at the base of the antenna to step up the low impedance to match your coaxial cable and transceiver.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Calculating Dimensions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Designing a normal-mode helix requires finding a balance between the physical height you can support and the amount of wire required to achieve electrical resonance. A standard empirical rule of thumb for a continuously loaded quarter-wave equivalent is that the <em>length of the wire<\/em> required will be approximately 50% of the physical wavelength.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is the text-based breakdown of the design calculations and steps for building a 160m normal-mode helical antenna.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Core Formulas<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">To design the continuously loaded vertical, you need to calculate the total length of wire required to achieve electrical resonance, and then figure out how to distribute that wire over your chosen physical mast.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Wavelength (\u03bb):<\/strong> \u00a0\u03bb = 300\/f (where f is the target frequency in MHz)<\/li>\n\n\n\n<li><strong>Approximate Wire Length:<\/strong> A standard empirical rule is that the required wire length is roughly half the wavelength (0.5\u00a0\u03bb).<\/li>\n\n\n\n<li><strong>Circumference per Turn (C):<\/strong> C = \u03c0 x D (where D is the outer diameter of your mast)<\/li>\n\n\n\n<li><strong>Total Number of Turns (N):<\/strong> N = Total Wire Length\/C<\/li>\n\n\n\n<li><strong>Turn Spacing:<\/strong> Spacing = Physical Height of Mast\/N<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">A Practical Example Build<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s assume you are targeting 1.85 MHz. You are using a standard 50 mm (approx. 2-inch) PVC pipe as your former, and you want the physical antenna to be 5 meters tall.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Target Frequency:<\/strong> 1.85 MHz<\/li>\n\n\n\n<li><strong>Wavelength:<\/strong> 300\/1.85 ~162.16 meters<\/li>\n\n\n\n<li><strong>Required Wire Length:<\/strong>162.16 x 0.5 ~ 81.08 meters of wire<\/li>\n\n\n\n<li><strong>Circumference of 50 mm PVC:<\/strong> \u03c0 x 0.05 ~ 0.157 meters per turn<\/li>\n\n\n\n<li><strong>Total Turns Needed:<\/strong> 81.08\/0.157 ~ 516 turns<\/li>\n\n\n\n<li><strong>Spacing Between Turns:<\/strong> 5000 mm\/516 ~ 9.7 mm spacing between each wrap<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Construction and Tuning Notes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wire Selection:<\/strong> When pushing 100W, using 14 AWG or 12 AWG enameled copper (magnet) wire is highly recommended. The lower the gauge, the better you will minimize resistive losses in the tightly wound coil.<\/li>\n\n\n\n<li><strong>The Ground System:<\/strong> This is the make-or-break component. A drastically shortened 160m vertical will have an extremely low feedpoint radiation resistance (often single digits). Without an extensive network of ground radials laid out at the base, your RF energy will dissipate as heat into the soil rather than radiating.<\/li>\n\n\n\n<li><strong>Impedance Matching:<\/strong> The feedpoint impedance will not be a flat 50 ohms. You will need an L-network matching unit installed directly at the base of the antenna to step up the impedance to match your transceiver and coax.<\/li>\n\n\n\n<li><strong>Final Alignment:<\/strong> The 0.5 \u03bb rule for wire length is just a theoretical starting point. Stray capacitance from the PVC former, the wire insulation, and nearby objects will shift the resonance. It is best to wind about 5% to 10% more wire than the math dictates. Use an antenna analyzer or VNA at the base, measure the actual resonant frequency, and slowly prune the wire or adjust the compression of the top turns to dial it precisely into 1.85 MHz.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">VU 160m band is from 1.8 to 1.825 MHz only:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">That narrow 25 kHz window makes perfect sense for your regional allocations, and it actually works entirely to your advantage here. Normal-mode helical antennas have inherently narrow bandwidths\u2014often right around 20 to 30 kHz on the 160m band. This means once you tune it to the center of your band, you likely won&#8217;t need an antenna tuner to cover the rest of that specific segment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To optimize for this, we should target the exact center of your allocation: <strong>1.8125 MHz<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is how the theoretical math shifts for that specific frequency, assuming the same 5-meter physical height and 50 mm former from the previous example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wavelength:<\/strong> 300\/1.8125 ~ 165.51 meters<\/li>\n\n\n\n<li><strong>Target Wire Length (0.5 \u03bb):<\/strong> 82.76 meters of wire<\/li>\n\n\n\n<li><strong>Total Turns Needed:<\/strong> 82.76\/0.157 ~ 527 turns<\/li>\n\n\n\n<li><strong>Spacing Between Turns:<\/strong> 5000\/527 ~ 9.48 mm<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A helical antenna is a specialized type of radio frequency antenna where the conducting wire is wound into the shape of a coil or helix, typically mounted over a flat reflecting ground plane. What makes the helical antenna unique is its versatility; its electrical behavior changes drastically depending on the physical size of the coil [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17175,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-17174","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>What is a Helical 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\/what-is-a-helical-antenna-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is a Helical Antenna? - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"A helical antenna is a specialized type of radio frequency antenna where the conducting wire is wound into the shape of a coil or helix, typically mounted over a flat reflecting ground plane. 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