{"id":6395,"date":"2016-01-29T11:06:00","date_gmt":"2016-01-29T00:06:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2016\/01\/29\/aa1tjs-150-microwatts-heard-at-112-kilometers-to-boldly-go-where-no-unijunction-has-gone-before\/"},"modified":"2016-01-29T11:06:00","modified_gmt":"2016-01-29T00:06:00","slug":"aa1tjs-150-microwatts-heard-at-112-kilometers-to-boldly-go-where-no-unijunction-has-gone-before","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2016\/01\/29\/aa1tjs-150-microwatts-heard-at-112-kilometers-to-boldly-go-where-no-unijunction-has-gone-before\/","title":{"rendered":"AA1TJ’s 150 Microwatts Heard at 112 Kilometers — “To Boldly Go Where no Unijunction Has Gone Before.”"},"content":{"rendered":"
<\/a><\/div>\n

AA1TJ reports: <\/b><\/span>

<\/b><\/span> Breaking news from W1PID… “Mike! I just copied the beacon. I got ‘VVV de AA1TJ 150 uw’ and it faded out. 2146Z on 3551.95MHz” That’s it! Jim copied a message produced by a lowly unijunction at a distance of 112km. How’s that for cool!<\/i> <\/span><\/b><\/span>In a nutshell… the unijunction runs as an R-C relaxation oscillator at ~500kHz. A quartz crystal at the emitter frequency-locks the sawtooth waveform to 507kHz. The 7th harmonic is admitted to the antenna via a bandpass filter. The RF output to DC input conversion efficiency is all of 0.1%. Heat-sink? Check! <\/i><\/span>Mission statement:
“…to boldly go where no unijunction has gone before.” <\/i><\/span>Cheers,
Mike, AA1TJ<\/i><\/span><\/b><\/span>

<\/b><\/span><\/i> I think the really cool thing is that EM waves are once again flying out of the Vermont Hobbit Hole, propelled into space by the poet laureate of QRP. <\/b><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

AA1TJ reports: Breaking news from W1PID… “Mike! I just copied the beacon. I got ‘VVV de AA1TJ 150 uw’ and it faded out. 2146Z on 3551.95MHz” That’s it! Jim copied a message produced by a lowly unijunction at a distance of 112km. How’s that for cool! In a nutshell… the unijunction runs as an R-C … Continue reading “AA1TJ’s 150 Microwatts Heard at 112 Kilometers — “To Boldly Go Where no Unijunction Has Gone Before.””<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87,86],"tags":[],"class_list":["post-6395","post","type-post","status-publish","format-standard","hentry","category-qrp","category-rainey-michael"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/6395","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=6395"}],"version-history":[{"count":0,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/6395\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=6395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=6395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=6395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}