{"id":9903,"date":"2011-10-31T10:14:00","date_gmt":"2011-10-30T23:14:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2011\/10\/31\/pumpkin-pi-and-jbot-gremlins\/"},"modified":"2025-07-22T03:31:18","modified_gmt":"2025-07-21T17:31:18","slug":"pumpkin-pi-and-jbot-gremlins","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2011\/10\/31\/pumpkin-pi-and-jbot-gremlins\/","title":{"rendered":"Pumpkin Pi and JBOT Gremlins"},"content":{"rendered":"<p><a onblur=\"try {parent.deselectBloggerImageGracefully();} catch(e) {}\" href=\"https:\/\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEglmw7POWeR72BGl-JidZ061nCUAjp7Vr2krXCknY1RqzBdkMo0YdGoPgJDRoXK89CfI9tmFVj_C4l8pEoI2fEcw-TGMZzjpH2zASSm4TWYdXmAXqN_aqG8yqbZwLEKPjPHdjxbfhgWApM\/s1600\/pumpkinpi\"><img decoding=\"async\" style=\"display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 290px; height: 400px;\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2011\/10\/image_1753119075.jpg\" alt=\"\" id=\"BLOGGER_PHOTO_ID_5669598177296620322\" border=\"0\" \/><\/a><span style=\"font-weight: bold;font-size:130%;\" >Maria wanted to go with a mathematical theme for this year&#8217;s Jack-0-Lantern. Pumpkin Pi!<\/p>\n<p>I have been chasing some gremlins and banshees around my old Azores 17 meter DSB rig. The JBOT Amp worked fine into a dummy load, but of course things got a bit more complicated when I put it into the rig and connected it to an antenna. It would take off (like a banshee!) if the load was at all reactive. I think this is the result of inadequate shielding and inputs a bit too close to outputs. But it all settles down nicely when I put a transmatch in the antenna line and tune out the reactance. I may just leave it this way.<\/p>\n<p>Output is a bit low &#8212; only about 1 Watt. I realize that at 18 MHz output should be dropping a bit, but I think I should be getting more. I THINK I&#8217;m giving it the recommended 1 milliwatt input. At some point I think Farhan mentioned the possible need to experiment with the number of turns on the secondary of the output transformer&#8230;.<br \/><\/span><br \/>Our book: &#8220;SolderSmoke &#8212; Global Adventures in Wireless Electronics&#8221;<a href=\"http:\/\/soldersmoke.com\/book.htm\">http:\/\/soldersmoke.com\/book.htm<\/a>Our coffee mugs, T-Shirts, bumper stickers: <a href=\"http:\/\/www.cafepress.com\/SolderSmoke\">http:\/\/www.cafepress.com\/SolderSmoke<\/a>Our Book Store: <a href=\"http:\/\/astore.amazon.com\/contracross-20\">http:\/\/astore.amazon.com\/contracross-20<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Maria wanted to go with a mathematical theme for this year&#8217;s Jack-0-Lantern. Pumpkin Pi! I have been chasing some gremlins and banshees around my old Azores 17 meter DSB rig. The JBOT Amp worked fine into a dummy load, but of course things got a bit more complicated when I put it into the rig &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2011\/10\/31\/pumpkin-pi-and-jbot-gremlins\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Pumpkin Pi and JBOT Gremlins&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":9904,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84,33,68],"tags":[],"class_list":["post-9903","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amplifier-theory","category-dsb","category-india"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/9903","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=9903"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/9903\/revisions"}],"predecessor-version":[{"id":9905,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/9903\/revisions\/9905"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/9904"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=9903"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=9903"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=9903"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}