{"id":4429,"date":"2014-04-15T09:42:00","date_gmt":"2014-04-14T23:42:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2014\/04\/15\/aa1tj-crosses-the-pond-with-10-milliwatts\/"},"modified":"2025-07-21T17:10:06","modified_gmt":"2025-07-21T07:10:06","slug":"aa1tj-crosses-the-pond-with-10-milliwatts","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2014\/04\/15\/aa1tj-crosses-the-pond-with-10-milliwatts\/","title":{"rendered":"AA1TJ Crosses the Pond with 10 milliwatts"},"content":{"rendered":"<div class=\"text_exposed_root text_exposed\" id=\"id_534cfce01252e8948058144\"> <\/p>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"> <a href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2014\/04\/aa1tjrig.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2014\/04\/aa1tjrig.jpg\" height=\"320\" width=\"400\" \/><\/a><\/div>\n<p> <strong>From a Facebook Post by Mike, AA1TJ: <\/strong><br \/> <strong><\/strong><br \/> <em><strong>Made 7 contacts with this tiny transceiver on 20m CW today with an RF output power of 10milliWatts. Five were stations in Georgia (GA QSO Party). The 6th was a regular QSO with a guy in Mississippi. <\/strong><\/em><br \/> <em><strong> I answered a DX station calling CQ at 2230Z. Hearing nothing in response, I sent my call sign a half-dozen times anyway. More silence. As I was reaching for the knob to QSY he suddenly returned my call! &#8230;Carlos, CT1BQH northeast of Lisbon, Portugal (that&#8217;s him in the second pho<span class=\"text_exposed_show\">to). I was only 329 on his end but we kept it going for three minutes! <\/span><\/strong><\/em> <\/p>\n<div class=\"text_exposed_show\"> <em><strong> FYI: the transmitter (top circuit board) begins with a 3.58MHz ceramic resonator VXO (a 2N706 from the early 60&#8217;s). That drives a push-push frequency doubler built around another 1960&#8217;s-vintage, 2N2644 (obsolete stock from atop Mt. Mansfield, kindly given to me by Rich at Vermont Public Television). On receive, the 7MHz energy is routed via a DPDT relay (the orange rectangle) to the sub-harmonic (Polyakov) mixer located on the lower board. One stage of AF amplification is provided by a 2N333 that came off the GE assembly line in November of 1958. The DPDT relay is keyed directly. On transmit the 7MHz energy feeds a second push-push frequency doubler to produce 10mW at 14MHz (all spurs -35dBc, or less, with only the output resonator). The relay also switches the antenna between the transmitter and receiver.<\/strong><\/em><br \/> <em><strong> Gosh, that was fun!<\/strong><\/em><\/div>\n<\/p><\/div>\n<p> <\/p>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"> <a href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2014\/04\/ct1bqh.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2014\/04\/ct1bqh.jpg\" height=\"210\" width=\"320\" \/><\/a><\/div>\n<div style=\"text-align: center;\"> CT1BQH<\/div>\n<p> 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>From a Facebook Post by Mike, AA1TJ: Made 7 contacts with this tiny transceiver on 20m CW today with an RF output power of 10milliWatts. Five were stations in Georgia (GA QSO Party). The 6th was a regular QSO with a guy in Mississippi. I answered a DX station calling CQ at 2230Z. Hearing nothing &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2014\/04\/15\/aa1tj-crosses-the-pond-with-10-milliwatts\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;AA1TJ Crosses the Pond with 10 milliwatts&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":4430,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[157,85,401,87,86],"tags":[],"class_list":["post-4429","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aa1tj","category-minimalist-radio","category-portugal","category-qrp","category-rainey-michael"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/4429","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=4429"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/4429\/revisions"}],"predecessor-version":[{"id":4432,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/4429\/revisions\/4432"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/4430"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=4429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=4429"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=4429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}