{"id":61,"date":"2015-10-22T19:19:14","date_gmt":"2015-10-22T19:19:14","guid":{"rendered":"http:\/\/umarc.eecs.umich.edu\/?page_id=61"},"modified":"2015-10-22T19:34:48","modified_gmt":"2015-10-22T19:34:48","slug":"2-kw-hf-amplifier-rebuild","status":"publish","type":"page","link":"https:\/\/umarc.eecs.umich.edu\/index.php\/club-projects\/2-kw-hf-amplifier-rebuild\/","title":{"rendered":"2 kW HF Amplifier Rebuild"},"content":{"rendered":"<p align=\"justify\">The club&#8217;s <a href=\"http:\/\/www.bcdxc.org\/heathkit_sb220.htm\" target=\"_blank\">Heathkit SB-220 amplifier<\/a> has been repaired and is in use at W8UM. This amplifier uses a pair of <a href=\"http:\/\/www.umich.edu\/%7Eumarc\/station\/docs\/3-500z.pdf\" target=\"_blank\">3-500Z triodes<\/a> to generate 600 W (average) to 1200 W (PEP) of RF power on the 3.5 to 28 MHz amateur radio bands. The amplifier was donated to the club in 2003 by the original builder, Joe Firlit WA8RTL, a U-M EE alumnus. The amplifier was in excellent condition but benefitted from the replacement of several power supply components and some other minor modifications to improve its stability and reliability. For more information on this unit, refer to the <a href=\"https:\/\/umarc.eecs.umich.edu\/index.php\/w8um-station\/w8um-station-documentation\/\">W8UM Station Documentation<\/a> file.<\/p>\n<p align=\"justify\">Here are some photos of the SB-220 after the electronic work was completed:<\/p>\n<style id=\"bwg-style-0\">    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails {      width: 454px;              justify-content: center;        margin:0 auto !important;              background-color: rgba(255, 255, 255, 0.00);            padding-left: 4px;      padding-top: 4px;      max-width: 100%;            }        #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item {    justify-content: flex-start;      max-width: 150px;            width: 150px !important;          }    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item a {       margin-right: 4px;       margin-bottom: 4px;    }    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item0 {      padding: 0px;            background-color:rgba(255,255,255, 0.30);      border: 0px none #CCCCCC;      opacity: 1.00;      border-radius: 0;      box-shadow: 0px 0px 0px #888888;    }    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item1 img {      max-height: none;      max-width: none;      padding: 0 !important;    }        @media only screen and (min-width: 480px) {      #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item0 {        transition: all 0.3s ease 0s;-webkit-transition: all 0.3s ease 0s;      }      #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item0:hover {        -ms-transform: scale(1.1);        -webkit-transform: scale(1.1);        transform: scale(1.1);      }    }          #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item1 {      padding-top: 100%;    }        #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-title2,    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-ecommerce2 {      color: #CCCCCC;      font-family: segoe ui;      font-size: 16px;      font-weight: bold;      padding: 2px;      text-shadow: 0px 0px 0px #888888;      max-height: 100%;    }    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-thumb-description span {    color: #323A45;    font-family: Ubuntu;    font-size: 12px;    max-height: 100%;    word-wrap: break-word;    }    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-play-icon2 {      font-size: 32px;    }    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-ecommerce2 {      font-size: 19.2px;      color: #CCCCCC;    }    <\/style>    <div id=\"bwg_container1_0\"         class=\"bwg_container bwg_thumbnail bwg_thumbnails \"         data-right-click-protection=\"0\"         data-bwg=\"0\"         data-scroll=\"0\"         data-gallery-type=\"thumbnails\"         data-gallery-view-type=\"thumbnails\"         data-current-url=\"\/index.php\/wp-json\/wp\/v2\/pages\/61\"         data-lightbox-url=\"https:\/\/umarc.eecs.umich.edu\/wp-admin\/admin-ajax.php?action=GalleryBox&#038;current_view=0&#038;gallery_id=1&#038;tag=0&#038;theme_id=1&#038;shortcode_id=1&#038;sort_by=alt&#038;order_by=asc&#038;current_url=%2Findex.php%2Fwp-json%2Fwp%2Fv2%2Fpages%2F61\"         data-gallery-id=\"1\"         data-popup-width=\"800\"         data-popup-height=\"500\"         data-is-album=\"gallery\"         data-buttons-position=\"bottom\">      <div id=\"bwg_container2_0\">             <div id=\"ajax_loading_0\" class=\"bwg_loading_div_1\">      <div class=\"bwg_loading_div_2\">        <div class=\"bwg_loading_div_3\">          <div id=\"loading_div_0\" class=\"bwg_spider_ajax_loading\">          <\/div>      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return false;        });      <\/script>      <\/span>                <\/div>        <\/form>        <style>          #bwg_container1_0 #bwg_container2_0 #spider_popup_overlay_0 {          background-color: #000000;          opacity: 0.70;          }          <\/style>        <div id=\"bwg_spider_popup_loading_0\" class=\"bwg_spider_popup_loading\"><\/div>        <div id=\"spider_popup_overlay_0\" class=\"spider_popup_overlay\" onclick=\"spider_destroypopup(1000)\"><\/div>        <input type=\"hidden\" id=\"bwg_random_seed_0\" value=\"233678379\">                <\/div>    <\/div>    <script>      if (document.readyState === 'complete') {        if( typeof bwg_main_ready == 'function' ) {          if ( jQuery(\"#bwg_container1_0\").height() ) {            bwg_main_ready(jQuery(\"#bwg_container1_0\"));          }        }      } else {        document.addEventListener('DOMContentLoaded', function() {          if( typeof bwg_main_ready == 'function' ) {            if ( jQuery(\"#bwg_container1_0\").height() ) {             bwg_main_ready(jQuery(\"#bwg_container1_0\"));            }          }        });      }    <\/script>    \n<p align=\"justify\">Updated: January 2007<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The club&#8217;s Heathkit SB-220 amplifier has been repaired and is in use at W8UM. This amplifier uses a pair of 3-500Z triodes to generate 600 W (average) to 1200 W (PEP) of RF power on the 3.5 to 28 MHz amateur radio bands. The amplifier was donated to the club in 2003 by the original [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":19,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-sc.php","meta":{"footnotes":""},"class_list":["post-61","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/pages\/61","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/comments?post=61"}],"version-history":[{"count":4,"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/pages\/61\/revisions"}],"predecessor-version":[{"id":72,"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/pages\/61\/revisions\/72"}],"up":[{"embeddable":true,"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/pages\/19"}],"wp:attachment":[{"href":"https:\/\/umarc.eecs.umich.edu\/index.php\/wp-json\/wp\/v2\/media?parent=61"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}