{"id":38615,"date":"2019-07-22T06:30:05","date_gmt":"2019-07-22T10:30:05","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=38615"},"modified":"2019-07-22T06:30:05","modified_gmt":"2019-07-22T10:30:05","slug":"lz1aq-evaluates-impact-of-the-height-above-the-ground-on-mag-loop-performance","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2019\/07\/lz1aq-evaluates-impact-of-the-height-above-the-ground-on-mag-loop-performance\/","title":{"rendered":"LZ1AQ Evaluates Impact of the Height Above the Ground on Mag Loop Performance"},"content":{"rendered":"<div id=\"attachment_38617\" style=\"width: 437px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2019\/07\/fig1-loops-setup.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-38617\" class=\"size-full wp-image-38617\" src=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2019\/07\/fig1-loops-setup.jpg\" alt=\"\" width=\"427\" height=\"511\" srcset=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2019\/07\/fig1-loops-setup.jpg 427w, https:\/\/swling.com\/blog\/wp-content\/uploads\/2019\/07\/fig1-loops-setup-251x300.jpg 251w\" sizes=\"auto, (max-width: 427px) 100vw, 427px\" \/><\/a><p id=\"caption-attachment-38617\" class=\"wp-caption-text\">Source: LZ1AQ<\/p><\/div>\n<p>Many thanks to <em>SWLing Post<\/em> contributor, Harald Kuhl (DL1AX), who shares <a href=\"http:\/\/www.lz1aq.signacor.com\/docs\/loop-height-for-small-magnetic-loop.php\" target=\"_blank\" rel=\"noopener noreferrer\">the following article on LZ1AQ&#8217;s website<\/a>:<\/p>\n<blockquote><p><strong>Published on:<\/strong>\u00a02018\/11\/20, Rev. 1.0 July 2018, Rev. 1.1 Nov 2018<\/p>\n<p><strong>Author:<\/strong>\u00a0Chavdar Levkov LZ1AQ<\/p>\n<h2>Setup<\/h2>\n<p>Two identical small loops were placed one above the other according to\u00a0<em>Fig.1<\/em>. One of the loops is very low \u2013 almost on the ground. The other one is placed at height which usually is used by the loop users. Two\u00a0<a href=\"http:\/\/active-antenna.eu\/amplifier-kit\/\" target=\"_blank\" rel=\"noopener noreferrer\">AAA-1C wideband active antenna amplifiers<\/a>\u00a0were used. Their gain difference was not more than 0.3 dB. The feeder was FTP cable each 20 m long. No cable baluns were used. The outputs were connected through two way antenna switch to a SD RX (Perseus). I used a measurement technique described in &#8211;\u00a0<a href=\"http:\/\/www.lz1aq.signacor.com\/docs\/antenna-performance\/switching-technique-compare-receiving-antenna-performance.htm\" target=\"_blank\" rel=\"noopener noreferrer\">A Periodic Switching Technique to Compare Receiving Antenna Performance in the Presence of Strong Fading<\/a>. This is a precise method to compare two receiving antennas with real sky wave signals and the resolution can be less than a decibel. The idea is to switch periodically between two antennas and to estimate their difference on a calibrated graphic strength meter of a SD radio.[&#8230;]<\/p><\/blockquote>\n<p style=\"text-align: center;\"><strong><a href=\"http:\/\/www.lz1aq.signacor.com\/docs\/loop-height-for-small-magnetic-loop.php\" target=\"_blank\" rel=\"noopener noreferrer\">Click here to read the full article.<\/a><\/strong><\/p>\n<p>I&#8217;ve often assumed height had little effect on the performance of an HF loop antenna&#8211;this evaluation seems to support that theory. Thanks for sharing this, Harald!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Many thanks to SWLing Post contributor, Harald Kuhl (DL1AX), who shares the following article on LZ1AQ&#8217;s website: Published on:\u00a02018\/11\/20, Rev. 1.0 July 2018, Rev. 1.1 Nov 2018 Author:\u00a0Chavdar Levkov LZ1AQ Setup Two identical small loops were placed one above the other according to\u00a0Fig.1. One of the loops is very low \u2013 almost on the ground. [&hellip;]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3607,3,43],"tags":[1643,5396,5244,4357,3417],"class_list":["post-38615","post","type-post","status-publish","format-standard","hentry","category-antennas","category-news","category-shortwave-radio","tag-antennas","tag-harald-kuhl-dl1abj","tag-lz1aq","tag-mag-loop-antennas","tag-magnetic-loop-antennas"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-a2P","jetpack-related-posts":[{"id":50092,"url":"https:\/\/swling.com\/blog\/2021\/08\/mike-compares-four-active-mag-loop-antennas\/","url_meta":{"origin":38615,"position":0},"title":"Mike compares four active mag loop antennas","author":"Thomas","date":"August 28, 2021","format":false,"excerpt":"Many thanks to Jon Hudson who shared the following on the SDRplay Facebook page: In this new video, Mike Harwood compares 4 different active mag loop antenna at various frequencies up to 52MHz using two SDRplay RSPduos which allowed simultaneous spectrum snapshots of the 4 loops in action with real\u2026","rel":"","context":"In &quot;Antennas&quot;","block_context":{"text":"Antennas","link":"https:\/\/swling.com\/blog\/category\/antennas\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/02\/MFJ-Mag-Loop-Antenna.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/02\/MFJ-Mag-Loop-Antenna.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/02\/MFJ-Mag-Loop-Antenna.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/02\/MFJ-Mag-Loop-Antenna.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":17926,"url":"https:\/\/swling.com\/blog\/2016\/03\/guest-post-building-a-magnetic-loop-antenna-broadband-amplifier-for-your-sdr\/","url_meta":{"origin":38615,"position":1},"title":"Guest Post: Building a magnetic loop antenna &#038; broadband amplifier for your SDR","author":"Thomas","date":"March 26, 2016","format":false,"excerpt":"Many thanks to SWLing Post contributor,\u00a0Dave Gahimer (K9ZCE) for the following guest post: Small Magnetic Loop Antenna with Broadband Amplifier for SDR Reception by Dave Gahimer (K9ZCE) Those with limited space, or antenna restrictions, might find a small 1 meter loop antenna a solution. My son lives in an apartment.\u2026","rel":"","context":"In &quot;Accessories&quot;","block_context":{"text":"Accessories","link":"https:\/\/swling.com\/blog\/category\/accessories\/"},"img":{"alt_text":"Loop-Antenna","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/Loop-Antenna.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/Loop-Antenna.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/Loop-Antenna.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":18772,"url":"https:\/\/swling.com\/blog\/2016\/07\/the-aaa-1c-an-affordable-loop-antenna-amplifier-kit\/","url_meta":{"origin":38615,"position":2},"title":"The AAA-1C: An affordable loop antenna amplifier kit","author":"Thomas","date":"July 19, 2016","format":false,"excerpt":"I recently stumbled upon the\u00a0Active Antenna Amplifier (model AAA-1C) by LZ1AQ. At 87.00 EUR, it's a pretty affordable and flexible solution for those who would like to design or use a loop antenna. According to the website, it packs a lot of features: 4 remotely switched modes (Loop A, Loop\u2026","rel":"","context":"In &quot;Antennas&quot;","block_context":{"text":"Antennas","link":"https:\/\/swling.com\/blog\/category\/antennas\/"},"img":{"alt_text":"Active-Antenna-the-kit-product-7","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/05\/Active-Antenna-the-kit-product-7.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/05\/Active-Antenna-the-kit-product-7.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/05\/Active-Antenna-the-kit-product-7.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":53868,"url":"https:\/\/swling.com\/blog\/2022\/09\/dan-reviews-the-new-chameleon-cha-rxl-pro-wideband-magnetic-loop-antenna\/","url_meta":{"origin":38615,"position":3},"title":"Dan reviews the new Chameleon CHA RXL Pro Wideband Magnetic Loop Antenna","author":"Thomas","date":"September 3, 2022","format":false,"excerpt":"Many thanks to\u00a0SWLing Post\u00a0contributor,\u00a0Dan Robinson, for the following guest post and review: The Chameleon CHA-RXL Pro:\u00a0 Improved Amp Board Raises the Game by Dan Robinson Back in 2021 I reviewed the CHA-RXL loop by Chameleon.\u00a0 This loop antenna is sold by major retailers such as DX Engineering, Gigaparts and Chameleon\u2026","rel":"","context":"In &quot;Antennas&quot;","block_context":{"text":"Antennas","link":"https:\/\/swling.com\/blog\/category\/antennas\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/09\/Chameleon-CHA-RXL-PRO-Preamp-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/09\/Chameleon-CHA-RXL-PRO-Preamp-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/09\/Chameleon-CHA-RXL-PRO-Preamp-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/09\/Chameleon-CHA-RXL-PRO-Preamp-1.jpeg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":49586,"url":"https:\/\/swling.com\/blog\/2021\/07\/mike-harwood-explores-active-magnetic-loop-antennas-with-sdrplay\/","url_meta":{"origin":38615,"position":4},"title":"Mike Harwood explores active magnetic loop antennas with SDRplay","author":"Thomas","date":"July 11, 2021","format":false,"excerpt":"Many thanks to Jon Hudson with SDRplay who shares the following announcement: Introducing a new series of videos comparing the performance of wideband active loop amplifier\/antennas for HF frequencies and below. In this introductory video, Mike Harwood shows how an RSPduo enables a real-time comparison of two antennas - in\u2026","rel":"","context":"In &quot;Antennas&quot;","block_context":{"text":"Antennas","link":"https:\/\/swling.com\/blog\/category\/antennas\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/05\/SDRplay-RSPduo-Antenna-Ports-Angle-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/05\/SDRplay-RSPduo-Antenna-Ports-Angle-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/05\/SDRplay-RSPduo-Antenna-Ports-Angle-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/05\/SDRplay-RSPduo-Antenna-Ports-Angle-2.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":64962,"url":"https:\/\/swling.com\/blog\/2025\/12\/don-pushes-portable-antennas-further-loop-size-performance-and-real-world-limits-part-2\/","url_meta":{"origin":38615,"position":5},"title":"Don Pushes Portable Antennas Further: Loop Size, Performance, and Real-World Limits (Part 2)","author":"Thomas","date":"December 27, 2025","format":false,"excerpt":"Many thanks to SWLing Post contributor\u00a0Don Moore\u2013noted\u00a0author, traveler, and DXer\u2013who shares the following post: Two Portable Antennas for Remote DXing (Part Two) By Don Moore Don\u2019s traveling DX stories can be found in his book\u00a0Tales of a Vagabond DXer\u00a0[SWLing Post affiliate link].\u00a0If you\u2019ve already read his book and enjoyed it,\u2026","rel":"","context":"In &quot;Antennas&quot;","block_context":{"text":"Antennas","link":"https:\/\/swling.com\/blog\/category\/antennas\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/60_MegaLoopDelta.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/60_MegaLoopDelta.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/60_MegaLoopDelta.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/60_MegaLoopDelta.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/60_MegaLoopDelta.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/38615","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/comments?post=38615"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/38615\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=38615"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=38615"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=38615"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}