{"id":11,"date":"2015-09-06T19:38:55","date_gmt":"2015-09-06T19:38:55","guid":{"rendered":"https:\/\/geekblog.febo.com\/wp\/?p=11"},"modified":"2015-11-22T00:11:21","modified_gmt":"2015-11-22T00:11:21","slug":"more-ocxo-adjustments","status":"publish","type":"post","link":"https:\/\/blog.febo.com\/?p=11","title":{"rendered":"More OCXO Adjustments"},"content":{"rendered":"<p>More twiddling of the OCXOs this afternoon.<\/p>\n<ul>\n<li>Austron 1250A:\u00c2\u00a0 was tune 375, +3.9e9; now tune 340, +4.5e12<\/li>\n<li>FTS 1050A: was tune 55000, +2.1e9; now tune 54614, -1.7e12<\/li>\n<li>Sulzer #1 (2.5 MHz): was tune +0.39, +7.2e9; now tune -0.56 (CCW past zero), -3.2e12<\/li>\n<li>Sulzer #2 (5 MHz): was tune 9.23, -1.4e9; now tune 9.31, -1.2e11<\/li>\n<\/ul>\n<p>All these comparisons are against an HP 5061A Cesium standard that tracks GPS at about -2e13.\u00c2\u00a0 The Sulzers have mechanical tuning (flexible shaft to a piston capacitor) and given that they are around 50 years old, setting them is a bit touchy.\u00c2\u00a0 They can take an hour or more to fully settle after adjusting the trimmer.<\/p>\n<p>The goal here isn&#8217;t perfection, and getting all these guys to within 1e11 or so is all I need.\u00c2\u00a0 My goal is just to get them close enough to nominal frequency that cycle wrap isn&#8217;t likely to occur over long measurement periods.\u00c2\u00a0 I don&#8217;t plan to touch any of them again for another year or more.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>More twiddling of the OCXOs this afternoon. Austron 1250A:\u00c2\u00a0 was tune 375, +3.9e9; now tune 340, +4.5e12 FTS 1050A: was tune 55000, +2.1e9; now tune 54614, -1.7e12 Sulzer #1 (2.5&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-11","post","type-post","status-publish","format-standard","hentry","category-time-and-frequency"],"_links":{"self":[{"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/posts\/11","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.febo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=11"}],"version-history":[{"count":4,"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/posts\/11\/revisions"}],"predecessor-version":[{"id":15,"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/posts\/11\/revisions\/15"}],"wp:attachment":[{"href":"https:\/\/blog.febo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.febo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.febo.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}