{"id":37302,"date":"2014-11-11T00:00:56","date_gmt":"2014-11-10T22:00:56","guid":{"rendered":"http:\/\/www.cqdx.ru\/ham\/?p=37302"},"modified":"2023-09-25T19:57:22","modified_gmt":"2023-09-25T17:57:22","slug":"chameleon-emcomm-ii-portable-hf-antenna-antenna","status":"publish","type":"post","link":"https:\/\/www.cqdx.ru\/ham\/new-equipment\/chameleon-emcomm-ii-portable-hf-antenna-antenna\/","title":{"rendered":"Chameleon EMCOMM II Portable HF Antenna Antenna"},"content":{"rendered":"<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-37303\" src=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/02\/0991.jpg\" alt=\"0991\" width=\"422\" height=\"323\" srcset=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/02\/0991.jpg 422w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/02\/0991-300x230.jpg 300w\" sizes=\"auto, (max-width: 422px) 100vw, 422px\" \/><\/p>\n<p>1.8-54 MHz. The\u00a0<b>Chameleon EMCOMM II<\/b> Antenna has been specially designed for backup <strong>emergency HF<\/strong> system or permanent installation. The integral broadband impedance matching network (transformer 5:1) allows broadband antenna tuning. It is the perfect backup antenna for apartments, condominiums, homeowners associations, deed restrictions and CCRs (Covenants, Conditions &amp; Restrictions), ARES, RACES, MARS, EMCOMM, NVIS, First Responders and especially for Emergency Preparedness. The unit is totally waterproof. The antenna is 60\u2019 long and covers 6M to 160M. An external tuner is required.<\/p>\n<p><a href=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/stacks_image_438.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-37307 size-medium\" src=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/stacks_image_438-300x159.png\" alt=\"stacks_image_438\" width=\"300\" height=\"159\" srcset=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/stacks_image_438-300x159.png 300w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/stacks_image_438.png 746w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><strong>Specifications:<\/strong><\/p>\n<ul>\n<li>Frequency: 6M &#8211; 160M<\/li>\n<li>Power: 500W SSB or 250W CW<\/li>\n<li>RF Connection: PL-259<\/li>\n<li>VSWR: Subject to configuration<\/li>\n<li>Length: 60\u2019<\/li>\n<li>Weight: 1 Lb.<\/li>\n<li>Mounting Configuration: None<\/li>\n<\/ul>\n<p><strong>The antenna system consists of:<\/strong><\/p>\n<p>1 X CHA EMCOMM II matching box<br \/>\n1 X 60\u2019 wire<\/p>\n<p><a href=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/02\/0991pkg.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-37304 size-medium\" src=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/02\/0991pkg-300x167.jpg\" alt=\"0991pkg\" width=\"300\" height=\"167\" srcset=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/02\/0991pkg-300x167.jpg 300w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/02\/0991pkg.jpg 720w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The antenna will perform very well with a sloper or an &#8220;Inverted-Vee&#8221; configuration. For a NVIS configuration (40M \/ 80M) the antenna must be installed horizontally with the ground and elevated between 9&#8243; and 12&#8243; high.The EMCOMM II does not require a ground-plane but will perform better with one. A ground terminal is available for that purpose. Power capacity is 500 watts SSB or 250 watts CW. SO-239 input.<\/p>\n<div class=\"lyte-wrapper\" title=\"Chameleon Antenna - EMCOMM II - 80M NVIS\" style=\"width:640px;max-width:100%;margin:5px auto;\"><div class=\"lyMe hidef\" id=\"WYL_UPBJfiBJQY0\"><div id=\"lyte_UPBJfiBJQY0\" data-src=\"https:\/\/i.ytimg.com\/vi\/UPBJfiBJQY0\/hqdefault.jpg\" class=\"pL\"><div class=\"tC\"><div class=\"tT\">Chameleon Antenna - EMCOMM II - 80M NVIS<\/div><\/div><div class=\"play\"><\/div><div class=\"ctrl\"><div class=\"Lctrl\"><\/div><div class=\"Rctrl\"><\/div><\/div><\/div><noscript><a href=\"https:\/\/youtu.be\/UPBJfiBJQY0\" rel=\"nofollow\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i.ytimg.com\/vi\/UPBJfiBJQY0\/0.jpg\" alt=\"Chameleon Antenna - EMCOMM II - 80M NVIS\" width=\"640\" height=\"340\" \/><br \/>Watch this video on YouTube<\/a><\/noscript><\/div><\/div><div class=\"lL\" style=\"max-width:100%;width:640px;margin:5px auto;\"><\/div>\n<div class=\"lyte-wrapper\" title=\"CHA EMCOMM II 40M &amp;amp; 15M Horizontal\" style=\"width:640px;max-width:100%;margin:5px auto;\"><div class=\"lyMe hidef\" id=\"WYL_WmYt8F8D1Zc\"><div id=\"lyte_WmYt8F8D1Zc\" data-src=\"https:\/\/i.ytimg.com\/vi\/WmYt8F8D1Zc\/hqdefault.jpg\" class=\"pL\"><div class=\"tC\"><div class=\"tT\">CHA EMCOMM II 40M &amp; 15M Horizontal<\/div><\/div><div class=\"play\"><\/div><div class=\"ctrl\"><div class=\"Lctrl\"><\/div><div class=\"Rctrl\"><\/div><\/div><\/div><noscript><a href=\"https:\/\/youtu.be\/WmYt8F8D1Zc\" rel=\"nofollow\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i.ytimg.com\/vi\/WmYt8F8D1Zc\/0.jpg\" alt=\"CHA EMCOMM II 40M &amp;amp; 15M Horizontal\" width=\"640\" height=\"340\" \/><br \/>Watch this video on YouTube<\/a><\/noscript><\/div><\/div><div class=\"lL\" style=\"max-width:100%;width:640px;margin:5px auto;\"><\/div>\n<p><strong>NVIS Installation:<\/strong><\/p>\n<p><a href=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.22-AM.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-37314 size-medium\" src=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.22-AM-300x146.jpg\" alt=\"Screen Shot 2014-02-07 at 7.51.22 AM\" width=\"300\" height=\"146\" srcset=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.22-AM-300x146.jpg 300w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.22-AM-1024x498.jpg 1024w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.22-AM-768x374.jpg 768w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.22-AM-1536x748.jpg 1536w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.22-AM.jpg 1553w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a> <a href=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.38-AM.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-37315 size-medium\" src=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.38-AM-300x154.jpg\" alt=\"Screen Shot 2014-02-07 at 7.51.38 AM\" width=\"300\" height=\"154\" srcset=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.38-AM-300x154.jpg 300w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.38-AM-1024x526.jpg 1024w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.38-AM-768x394.jpg 768w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.51.38-AM.jpg 1514w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The sloper is considered the most unusual antenna system and can be difficult to get to work properly. The sloper may exhibit some gain in one direction, but usually has omni direction pattern. There are two types of sloper, the full sloper, really a dipole mounted with one end higher than the other. The half-sloper (EMCOMM II) is fed at one end with a \u201cground system\u201d or counter poise provided by either physical ground if fed at lower end of sloper. If the sloper is fed at the top, then other factors provide the \u201cground\u201d. In most cases, a sloper mounted on a tower, then the tower and importantly, the beam mounted on top, act as the counterpoise.One successful version of the sloper (most folks call any kind\u00a0of sloper simply a \u201csloper\u201d regardless of its type) is one that is fed with coax. The antenna is fed from the top and installed on a tower with a beam on top. The center conductor of the coax feeds the sloper wire and the shield is carefully bonded to the tower structure. In addition the beam, rotor, and mast are electrically bonded to the tower (here a heavy braided strap connecting\u00a0the mast to the tower is recommended). The theory is that the sloper is fed\u00a0at the top and the high current point is high just under the beam, leading\u00a0away from the tower.<\/p>\n<div id=\"stacks_out_885_page5\">\n<div id=\"stacks_in_885_page5\">\n<p>The sloper has been reported to be hard to get to work in some\u00a0cases. When it works, its performance when used with a tower and a beam is\u00a0very good. Considering the cost of materials (assuming the tower is in\u00a0place already) the sloper should be considered.<\/p>\n<\/div>\n<div><a href=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.49.59-AM.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-37313 size-medium\" src=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.49.59-AM-300x145.jpg\" alt=\"Screen Shot 2014-02-07 at 7.49.59 AM\" width=\"300\" height=\"145\" srcset=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.49.59-AM-300x145.jpg 300w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.49.59-AM-1024x494.jpg 1024w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.49.59-AM-768x370.jpg 768w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-02-07-at-7.49.59-AM.jpg 1510w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/div>\n<div>\n<p>This is most likely\u00a0the least expensive high performance\u00a0antenna\u00a0you can erect for 40M, 80M and 160M (limited performance). It is worth investigating since it\u00a0needs only one high point in the relative clear to be effective (the horizontal\u00a0far end can be at a lesser elevation, details later).Most likely you will need to use an external antenna tuner.The main radiating component of the \u201cL\u201d is the vertical\u00a0wire, that\u2019s what makes it a very good groundwave and DX antenna. So it would be good if this can be kept in the clear, or several feet\u00a0away from your tower, and of course, as high as you can make it. The horizontal part may slope downward, or bent several\u00a0times to accommodate any obstacles. Keep in mind, the more you bend the element back on itself, the more of the radiated signal is canceled out.Sometimes it is not possible to have the vertical section longer than the horizontal section. This will result in more of the signal being radiated skyward to which NVIS (Near Vertical Incident Skywave) will occur. \u00a0NVIS is a\u00a0propagation method that provides usable signals in the range between\u00a0ground wave\u00a0and\u00a0skywave\u00a0distances (usually 30 to 400 miles).Before we go any further,\u00a0this antenna requires a robust ground system. If your ground is poor, the antenna efficiency\u00a0will be poor, and you will be troubled with RF in the shack.The radiation pattern is omni directional, with a possible minor lobe in the direction of the horizontal portion.<\/p>\n<\/div>\n<\/div>\n<p>Price: $115.00 USD<\/p>\n<p><a href=\"http:\/\/chameleonantenna.com\/BASE%20ANTENNA\/CHA%20EMCOMM%20II\/CHA%20EMCOMM%20II.html\" target=\"_blank\" rel=\"noopener\">Link<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.8-54 MHz. The\u00a0Chameleon EMCOMM II Antenna has been specially designed for backup emergency HF system or permanent installation. The integral broadband impedance matching network (transformer 5:1) allows broadband antenna tuning. It is the perfect backup antenna for apartments, condominiums, homeowners associations, deed restrictions and CCRs (Covenants, Conditions &amp; Restrictions), ARES, RACES, MARS, EMCOMM, NVIS, First&hellip;<\/p>\n","protected":false},"author":2,"featured_media":37303,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[8],"tags":[43,46,304],"class_list":["post-37302","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-new-equipment","tag-antenna","tag-antennas","tag-new-equipment-2","category-8","description-off"],"_links":{"self":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/posts\/37302","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/comments?post=37302"}],"version-history":[{"count":0,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/posts\/37302\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/media\/37303"}],"wp:attachment":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/media?parent=37302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/categories?post=37302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/tags?post=37302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}