{"id":922,"date":"2011-12-07T14:46:07","date_gmt":"2011-12-07T14:46:07","guid":{"rendered":"http:\/\/lefars.org.uk\/WPblog\/?p=922"},"modified":"2012-01-03T19:49:24","modified_gmt":"2012-01-03T19:49:24","slug":"innovantennas-visits-lefars","status":"publish","type":"post","link":"https:\/\/lefars.org.uk\/WPblog\/innovantennas-visits-lefars\/","title":{"rendered":"InnovAntennas visits LEFARS"},"content":{"rendered":"

On Friday 2nd December LEFARS were pleased to receive Justin Johnson G0KSC and Joe (J\u00f3zsef) Gy\u00f6ngy\u00f6si HA5CW \/ M0HAA from InnovAntennas, Canvey.\u00a0 This visit was scheduled last month but had to be delayed.\u00a0 Justin is well known for his innovative Yagi designs and he was happy to share his knowledge and experience.<\/p>\n

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Justin Johnson G0KSC and Joe Gy\u00f6ngy\u00f6si HA5CW \/ M0HAA at LEFARS<\/p><\/div>\n

The meeting started with Justin providing an overview of his Yagi designs and computer design technology using programs costing 4-figure prices.\u00a0 Impressive images of G0KSC HF Yagis and arrays built to his OWA<\/strong> (O<\/strong>ptimised W<\/strong>ideband A<\/strong>rray) design by amateurs worldwide were shown.\u00a0 The design information is freely available to make your own Yagi.\u00a0 The OWA design provides maximum performance whilst maintaining a 50 Ohm impedance in order to help ensure minimum losses and maximum radiating efficiency.\u00a0 With low and flat SWR curves, return losses are minimised.\u00a0 The OWA design does not require any matching system (ATU\/AMU etc.) and provides excellent stability even in rain; it will not de-tune.<\/p>\n

For more information, including build instructions, visit Justin’s website (links below).\u00a0 Design data is provided for HF (20m-10m),6m and 2m OWA Yagis.\u00a0 These range in sizes ranging from 4 to 7 elements for HF, 4 to 11 elements for 6m, 8 to 16 elements for 2m.<\/p>\n

Justin G0KSC went on to describe the development of the LFA<\/strong> and OWL<\/strong> range of Yagi antennas.\u00a0 The L<\/strong>oop F<\/strong>ed A<\/strong>rray Yagi (more LFA info here<\/a>) replaces the traditional split dipole element with a rectangular loop; this provides a 50 ohm feedpoint impedance and no matching.\u00a0 The OWL<\/strong> (O<\/strong>ptimised W<\/strong>ideband L<\/strong>ow Impedance) Yagi build on the characteristics of the OWA Yagi and utilises the low impedance characteristics (wide bandwidth and good front to back ratio) whilst improving side lobe suppression; important to reduce the effect on one’s neighbours and possible QRM (plasma TVs etc.).\u00a0 More info on OWL antennas and design here<\/a>.\u00a0 Justin also covered other important aspects of Yagi design and construction.\u00a0 For high frequency antennas, build accuracy is paramount.\u00a0 CNC equipment is used by InnovAntennas in their new factory at Canvey to manufacture parts to better than 0.1mm.\u00a0 The budding home builders were re-assured that this is not so critical for HF and VHF antennas.\u00a0 Using SWR and frequency plots, Justin also showed the importance of achieving a low-noise design and maintaining a low SWR across the entire bandwidth.<\/p>\n

After Justin’s talk, there was plenty of time for the members to ask questions.\u00a0 For those who want to build their own Yagi, Justin sells the a range of insulators, clips, boom and element end clips etc.\u00a0 Also fully assembled antennas to his various patented designs.\u00a0 InnoVAntennas moved to their new factory in Canvey last month (November 2011).<\/p>\n

We wish to thank Justin G0KSC and Joe HA5CW \/ M0HAA of InnovAntennas for taking time to visit LEFARS.<\/p>\n

73<\/p>\n

John G8DZH
\nLEFARS Newsletter Editor.
\nEmail: g8dzh@lefars.org.uk<\/p>\n

Websites.\u00a0\u00a0\u00a0 http:\/\/www.g0ksc.co.uk<\/a>\u00a0\u00a0\u00a0\u00a0 http:\/\/www.innovantennas.com<\/a><\/p>\n

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John G0VEH makes a brew (Notice the modification to the tea urn!!).<\/p><\/div>\n

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Yes - it is a fuselink!<\/p><\/div>\n

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Selim 2E0EKF discusses Yagis with Justin G0KSC<\/p><\/div>\n

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Paul G6XIP (left) and Keith G1HEQ (right) in conversation with Justin.<\/p><\/div>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

On Friday 2nd December LEFARS were pleased to receive Justin Johnson G0KSC and Joe (J\u00f3zsef) Gy\u00f6ngy\u00f6si HA5CW \/ M0HAA from InnovAntennas, Canvey.\u00a0 This visit was scheduled last month but had to be delayed.\u00a0 Justin is well known for his innovative … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"gallery","meta":{"_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":""},"categories":[43,11],"tags":[50,51,49,52],"class_list":["post-922","post","type-post","status-publish","format-gallery","hentry","category-antennas","category-meetings","tag-g0ksc","tag-ha5cw","tag-innovantennas","tag-m0haa","post_format-post-format-gallery"],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p22sia-eS","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/posts\/922","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/comments?post=922"}],"version-history":[{"count":32,"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/posts\/922\/revisions"}],"predecessor-version":[{"id":936,"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/posts\/922\/revisions\/936"}],"wp:attachment":[{"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/media?parent=922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/categories?post=922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lefars.org.uk\/WPblog\/wp-json\/wp\/v2\/tags?post=922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}