{"id":8984,"date":"2012-01-21T14:58:00","date_gmt":"2012-01-21T03:58:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2012\/01\/21\/jbot-installed-in-azores-17-meter-ssb-rig\/"},"modified":"2025-07-22T01:43:56","modified_gmt":"2025-07-21T15:43:56","slug":"jbot-installed-in-azores-17-meter-ssb-rig","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2012\/01\/21\/jbot-installed-in-azores-17-meter-ssb-rig\/","title":{"rendered":"JBOT Installed in Azores 17 Meter SSB Rig"},"content":{"rendered":"

\"\"<\/a>Even though one of their Coronal Mass Ejections is due to hit us soon, the radio gods have been quite kind to me this morning. I installed the JBOT amplifier board in the 17 meter SSB transmitter that I had built out in the Azores during the last solar cycle. The board went in without any trouble. And I was a very surprised when it DIDN’T break into oscillation and instability! Holy Cow! This one was stable from the start! Even when connected to my antenna! Eureka! <\/p>\n

The rig still needs some peaking and tweaking. I’m only getting about 2-3 watts out and I should be getting 4-5. I did a quick and dirty “by ear” alignment — I just listened to my own signal with my trusty Drake 2-B and moved the carrier oscillator freq around a bit until the SSB audio sounded good (you never have to do that with DSB!).<\/span><\/p>\n

For those of you not familiar with this rig, here is some background: <\/span>
— Built on the chassis of an old Heath DX-40<\/span>
— Crystal filter at 5.174 MHz. Filter rocks and carrier oscillator rocks from an old Swan 240 I picked up in the Dominican Republic from Pericles Perdomo HI8P (SK). <\/span>
— Based on a design published in SPRAT by Frank Lee, G3YCC (SK). <\/span>
–Heterodyne oscillator is a G3RJV Universal VXO circuit running at around 23.3 MHz. <\/span>
— That orange cord to the big meter that you are no doubt wondering about is just a little circuit that monitors total current drawn by the rig. It bounces up and down as I talk. I put it in there mostly because I wanted to make use of a beautiful old Simpson meter that I picked up in 1973 at the Crystal Radio Club (W2DMC) in Valley Cottage, New York. <\/span><\/span><\/p>\n

\"\"<\/a>Going around, clockwise from below the meter: G3RJV VXO, carrier oscillator and two diode balanced modulator board, crystal filter (with NE602 mixer and post-filter bandpass filter to the left), JBOT PA. Audio amp (using op amp) below the chassis. T\/R relay in the center (antenna changeover relay below the chassis). <\/span><\/span><\/p>\n

Our book: “SolderSmoke — Global Adventures in Wireless Electronics”http:\/\/soldersmoke.com\/book.htm<\/a>Our coffee mugs, T-Shirts, bumper stickers: http:\/\/www.cafepress.com\/SolderSmoke<\/a>Our Book Store: http:\/\/astore.amazon.com\/contracross-20<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Even though one of their Coronal Mass Ejections is due to hit us soon, the radio gods have been quite kind to me this morning. I installed the JBOT amplifier board in the 17 meter SSB transmitter that I had built out in the Azores during the last solar cycle. The board went in without … Continue reading “JBOT Installed in Azores 17 Meter SSB Rig”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":8985,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44,164,146,19,235,17,23],"tags":[],"class_list":["post-8984","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-17-meters","category-azores","category-dobbs-george","category-dominican-republic","category-jbot","category-sprat","category-ssb"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8984","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=8984"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8984\/revisions"}],"predecessor-version":[{"id":8987,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8984\/revisions\/8987"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/8985"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=8984"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=8984"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=8984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}