{"id":3628,"date":"2023-02-17T16:50:28","date_gmt":"2023-02-17T16:50:28","guid":{"rendered":"https:\/\/sadars.co.uk\/wp\/?p=3628"},"modified":"2023-02-17T17:45:28","modified_gmt":"2023-02-17T17:45:28","slug":"16-feb-construction-contest-winnerstalks","status":"publish","type":"post","link":"https:\/\/sadars.co.uk\/wp\/archives\/3628","title":{"rendered":"16 Feb 2023\u2013 Construction  Winner&#8217;s Talk"},"content":{"rendered":"<p>Don, G4LOO began the evening with a quick run down of the RTTY contest of the week end. The score looks good and we await the final results.<\/p>\n<p>The main programme started with Don&#8217;s explanation of his <strong>Weekend Project<\/strong>. The original details were published in PW June 2016. The item was an entry in the 2015 Hackaday one square inch competition.\u00a0 Much later, Don acquired a commercially made board and started collecting the parts. The main delay in the building was the unavailability of a 74VHC4052 IC.\u00a0 Upon completion the unit was plugged into an NTL dongle to up convert\u00a0 HF frequencies to VHF<\/p>\n<figure id=\"attachment_3633\" aria-describedby=\"caption-attachment-3633\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/sadars.co.uk\/wp\/archives\/3628\/one-inch-square\" rel=\"attachment wp-att-3633\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-3633\" src=\"https:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/one-inch-square-300x280.jpg\" alt=\"\" width=\"300\" height=\"280\" srcset=\"https:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/one-inch-square-300x280.jpg 300w, https:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/one-inch-square.jpg 398w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-3633\" class=\"wp-caption-text\">The One Inch PCB<\/figcaption><\/figure>\n<p>The <strong>Kit Construction project<\/strong> explained next was Don&#8217;s Iceni 432MHz Transverter designed by Sam Jewell G4DDK.\u00a0 Don added a 30W Power Amplifier and control circuitry to the complete the project.<\/p>\n<figure id=\"attachment_3634\" aria-describedby=\"caption-attachment-3634\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/sadars.co.uk\/wp\/archives\/3628\/kit-project\" rel=\"attachment wp-att-3634\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3634 size-medium\" src=\"https:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/Kit-Project-300x142.jpg\" alt=\"\" width=\"300\" height=\"142\" srcset=\"https:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/Kit-Project-300x142.jpg 300w, https:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/Kit-Project.jpg 500w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-3634\" class=\"wp-caption-text\">The Kit Construction Project<\/figcaption><\/figure>\n<p>The <strong>Major Project<\/strong> was a 70MHz 300w Linear Amplifier which Don started with a part assembled kit from Enigma Components Ltd. Combined with a 48v and 12v power supply with coax changeover relays and LCD display controlled by an Arduino control unit, the finished project can handle an SWR of more than 65:1. It has been tested into open and short circuit loads at the output without damage. With efficiency of about 70% at 350W with 48v the power gain is more than 22dB equal to 2W input for 300W out. The harmonic output is less than 70dBc at 140-150MHz.<\/p>\n<figure id=\"attachment_3635\" aria-describedby=\"caption-attachment-3635\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/sadars.co.uk\/wp\/archives\/3628\/major-project-2\" rel=\"attachment wp-att-3635\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3635 size-full\" src=\"https:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/Major-Project-.jpg\" alt=\"\" width=\"500\" height=\"439\" srcset=\"https:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/Major-Project-.jpg 500w, https:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/Major-Project--300x263.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-3635\" class=\"wp-caption-text\">The 70MHz 300w Linear Amplifier<\/figcaption><\/figure>\n<p style=\"text-align: center;\">It&#8217;s no wonder Don had been chosen as winner in all three categories in this year&#8217;s construction Contest!<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Don, G4LOO began the evening with a quick run down of the RTTY contest of the week end. The score looks good and we await the final results. The main programme started with Don&#8217;s explanation of his Weekend Project. The original details were published in PW June 2016. The item was an entry in the &hellip; <a href=\"https:\/\/sadars.co.uk\/wp\/archives\/3628\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">16 Feb 2023\u2013 Construction  Winner&#8217;s Talk<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3628","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>16 Feb 2023\u2013 Construction Winner&#039;s Talk - SADARS: Shefford and District Amateur Radio Society<\/title>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"16 Feb 2023\u2013 Construction Winner&#039;s Talk - SADARS: Shefford and District Amateur Radio Society\" \/>\n<meta property=\"og:description\" content=\"Don, G4LOO began the evening with a quick run down of the RTTY contest of the week end. The score looks good and we await the final results. The main programme started with Don&#8217;s explanation of his Weekend Project. The original details were published in PW June 2016. 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