{"id":6071,"date":"2024-01-22T12:34:57","date_gmt":"2024-01-22T07:04:57","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=6071"},"modified":"2024-02-13T11:05:32","modified_gmt":"2024-02-13T05:35:32","slug":"upgrading-modified-inverted-v-to-40-20-m-dual-bander-antenna","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/upgrading-modified-inverted-v-to-40-20-m-dual-bander-antenna\/","title":{"rendered":"Upgrading Modified Inverted V to 40\/20 m Dual Bander Antenna"},"content":{"rendered":"<p>I had homebrewed a <a href=\"https:\/\/johnsonfrancis.org\/techworld\/modified-inverted-v-40-m-antenna\/\">Modified Inverted V 40 m Antenna<\/a> to fit in the limited space in my compound. Yesterday I could hear a VU station from the North at nearly 2000 km from here, loud and clear, on 20 m. But the built-in antenna tuner in my radio would not tune for 20 m, as expected, being second harmonic of 40 m, and not an odd number harmonic like 15 m. So I thought of adding a 20 m dipole as a <a href=\"https:\/\/johnsonfrancis.org\/techworld\/what-is-an-multiband-hf-fan-dipole-antenna\/\">fan dipole antenna<\/a> on the same feedline. I could bring down the 40 m antenna quickly as I had put a pulley like mechanism using nylon threads into a hole near the top of the 6 m GI pipe used as the mast. Instead of de-soldering the SO 239 joint, I thought of adding 5 m of insulated 2.5 sq. mm copper wire on either side of the feedpoint after removing the insulation of the existing antenna a few centimeters from the feedpoint.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6079\" src=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2024\/01\/Upgrading-Modified-Inverted-V-to-40-20-m-Dual-Bander-Antenna.jpg\" alt=\"\" width=\"1200\" height=\"675\" srcset=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2024\/01\/Upgrading-Modified-Inverted-V-to-40-20-m-Dual-Bander-Antenna.jpg 1200w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2024\/01\/Upgrading-Modified-Inverted-V-to-40-20-m-Dual-Bander-Antenna-300x169.jpg 300w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2024\/01\/Upgrading-Modified-Inverted-V-to-40-20-m-Dual-Bander-Antenna-1024x576.jpg 1024w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2024\/01\/Upgrading-Modified-Inverted-V-to-40-20-m-Dual-Bander-Antenna-768x432.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<p>That lazy method was chosen to avoid re-soldering the\u00a0 SO 239 joint which sometimes result in dry solder even with my 65 W soldering iron. But things did not turn out to be so easy for me. Murphy&#8217;s law came into play soon. By the time I had fixed the two limbs of the 20 m antenna to the existing 40 m antenna, the soldered joint on SO 239 gave way! I had to resolder it. Then I tried to pull the new fan dipole antenna up, the nylon thread used to make a pulley mechanism gave way! So I had to untie the 5 ties on the GI pipe and bring it down to recreate a pulley mechanism.<\/p>\n<p>As the pre-drilled hole was about 1 foot below the top, I used an insulated aluminium wire to make the pulley system and have it at the very top using another round of winding at the top. Though I should have anticipated it, after fixing the GI pipe with thicker nylon rope and raising it up, the moment I started raising the antenna, the ring of insulated aluminium wire at the top gave way and slipped down! Not only that, the nylon rope, this time a thicker one, used to pull the fan dipole antenna up, got stuck within the turns of the insulated aluminium wire. Instead of raising the antenna 1 foot above the previous position, I ended up having the antenna over 1 m lower than the previous position. So that is Murphy&#8217;s law: &#8220;Anything that can go wrong will go wrong&#8221; or better put as: &#8220;Anything that can go wrong will go wrong, and at the worst possible time.&#8221;<\/p>\n<p>I didn&#8217;t want to test Murphy&#8217;s law further and stopped work for the day, and tested the fan dipole antenna. 40 m component has an SWR of 1.1:1 at the lower end of the band and 1.9:1 at the upper end of the band. On 15 m, the values are 1.6:1 and 1.8:1. The ratios were the other way round on 20 m, with 3:1 at lower end of the band and 2:1 at the upper end of the band. I could hear some stations on 20 m after the antenna experiment. But I was not able to work any stations on 20 m, though the built-in antenna tuner in my radio is able to tune it well. On 40 m I am continuing to work stations, and today&#8217;s distance record was 1000 km, almost twice that of previous personal record, probably because of better band condition, as the antenna was lower. I am yet to work any station on 15 m either.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I had homebrewed a Modified Inverted V 40 m Antenna to fit in the limited space in my compound. Yesterday I could hear a VU station from the North at nearly 2000 km from here, loud and clear, on 20 m. But the built-in antenna tuner in my radio would not tune for 20 m, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6079,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,19],"tags":[],"class_list":["post-6071","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio","category-antenna-and-propagation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Upgrading Modified Inverted V to 40\/20 m Dual Bander 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\/upgrading-modified-inverted-v-to-40-20-m-dual-bander-antenna\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Upgrading Modified Inverted V to 40\/20 m Dual Bander Antenna - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"I had homebrewed a Modified Inverted V 40 m Antenna to fit in the limited space in my compound. 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