{"id":282,"date":"2017-12-10T04:46:59","date_gmt":"2017-12-10T04:46:59","guid":{"rendered":"http:\/\/www.hfsignals.com\/?page_id=282"},"modified":"2017-12-10T21:25:27","modified_gmt":"2017-12-10T21:25:27","slug":"ubitx-tuneup","status":"publish","type":"page","link":"https:\/\/www.hfsignals.com\/index.php\/ubitx-tuneup\/","title":{"rendered":"\u00b5BITX Tuneup"},"content":{"rendered":"<p>The \u00b5BITX comes pre-aligned. You should do this only if you really think it is out of alignment.<\/p>\n<p>There are three things to be tuned up.<\/p>\n<p><strong>1. PA BIAS<\/strong><\/p>\n<ul>\n<li>Switch off the rig<\/li>\n<li>Locate the two PA bias presets (the blue square ones)<\/li>\n<li>Set both the presets \u00a0to fully clockwise position, gently.<\/li>\n<li>Attach a dummy load or a low SWR antenna and switch the rig on<\/li>\n<li>Attach a current meter to the power supply so can monitor the current draw<\/li>\n<li>Switch on<\/li>\n<li>Press the PTT without speaking ( no modulation)<\/li>\n<li>The current draw should be between 470 mA and 500 mA<\/li>\n<li>Slowly increase one of the two presets until the current increases to by 100 ma<\/li>\n<li>Do the same for the other preset (the total current should have increased by 200 ma now)<\/li>\n<li>Now, blow a loud HALLLOWWW into the mic.<\/li>\n<\/ul>\n<p>Does the current flick up? \u00a0You&#8217;re done with PA Bias<\/p>\n<p><strong>2. Aligning the master clock<\/strong><\/p>\n<p>All the frequencies of the \u00b5BITX are derived by multiplying\/dividing to the required frequency from a single 25 MHz crystal. This crystal is rarely at exactly 25 MHz. We have to calibrate this clock to the exact frequency. Here is how it is done<\/p>\n<ul>\n<li>Click on the encoder button to display the menu, rotate it to the &#8220;Setup On?&#8221; and click on to confirm it. This enables the setup options.<\/li>\n<li>Tune to an AM broadcast signal with known frequency.<\/li>\n<li>Set the dial of the \u00b5BITX to read the exact given carrier frequency of the station. If your calibration is out, this will NOT be zero-beat.<\/li>\n<li>Click on the encoder button again to display menu and this time it will show up a new option &#8216;Set Calibration?&#8217;. Click to enter this option<\/li>\n<li>Now zero-beat to this signal (the frequency display of \u00b5BITX will remain the same)<\/li>\n<li>Press PTT to save the calibration.<\/li>\n<\/ul>\n<p><strong>3. Setting the BFO<\/strong><\/p>\n<ul>\n<li>Click on the encoder button to display the menu, rotate it to the &#8220;Setup On?&#8221; and click on to confirm it<\/li>\n<li>Tune to an clean and preferably weak SSB signal to its loudest (not the clearest)<\/li>\n<li>Click on the encoder button again to display menu and choose \u00a0Theoption &#8216;Set the BFO&#8217;. Click to enter this option<\/li>\n<li>Now tune with the encoder for the best sounding audio<\/li>\n<li>Press PTT to save the calibration.<\/li>\n<\/ul>\n<p>Done.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The \u00b5BITX comes pre-aligned. You should do this only if you really think it is out of alignment. There are three things to be tuned up. 1. PA BIAS Switch off the rig Locate the two PA bias presets (the blue square ones) Set both the presets \u00a0to fully clockwise position, gently. Attach a dummy &hellip; <a href=\"https:\/\/www.hfsignals.com\/index.php\/ubitx-tuneup\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;\u00b5BITX Tuneup&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-282","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.hfsignals.com\/index.php\/wp-json\/wp\/v2\/pages\/282","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hfsignals.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.hfsignals.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.hfsignals.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hfsignals.com\/index.php\/wp-json\/wp\/v2\/comments?post=282"}],"version-history":[{"count":2,"href":"https:\/\/www.hfsignals.com\/index.php\/wp-json\/wp\/v2\/pages\/282\/revisions"}],"predecessor-version":[{"id":315,"href":"https:\/\/www.hfsignals.com\/index.php\/wp-json\/wp\/v2\/pages\/282\/revisions\/315"}],"wp:attachment":[{"href":"https:\/\/www.hfsignals.com\/index.php\/wp-json\/wp\/v2\/media?parent=282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}