{"id":2765,"date":"2011-04-11T08:00:15","date_gmt":"2011-04-11T12:00:15","guid":{"rendered":"http:\/\/www.engineeringradio.us\/blog\/?p=3928"},"modified":"2023-04-30T14:20:29","modified_gmt":"2023-04-30T18:20:29","slug":"all-is-not-well-in-paradise","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2011\/04\/all-is-not-well-in-paradise\/","title":{"rendered":"All is not well in Paradise"},"content":{"rendered":"\n

If one considers paradise an FM35A. Going through another iteration of blown transmitter fuses for WEBE, Bridgeport, CT. Yesterday, I spent the afternoon examining the transmitter and found several interesting things:<\/p>\n\n\n\n

    \n
  1. Fresh arc tracks on the PA cavity and PA loading capacitor<\/li>\n\n\n\n
  2. The shoes and bars in the high-voltage contactor were severely pitted<\/li>\n\n\n\n
  3. One of the mains phases (middle) in the high voltage supply appears to be heating up, likely due to a loose connection.<\/li>\n<\/ol>\n\n\n\n
    \"Discolored<\/a>
    Discolored wire on buss bar<\/figcaption><\/figure>\n\n\n\n

    I checked and re-tightened all of the mains connections.  Apparently, this is an old problem, as the Allen screw was tight.  Interestingly, the fuse that was blown was on the red phase, which is different from what it was last time.<\/p>\n\n\n\n

    I spent the afternoon filing and sanding off the arc track marks in the PA cavity. \u00a0It is very important to file flat all sharp points that were the result of arcing. \u00a0Any sharp points will induce corona. \u00a0I also filed down all of the contacts in a high voltage contactor, which took a fair amount of time. These are soft copper shoes and bars that had so much pitting and carbon I wonder how they didn’t catch on fire. \u00a0I filed them flat. \u00a0We were back on the 35A transmitter at full power by 4:30 pm.<\/p>\n\n\n\n

    If this happens again, I will bring my megger out and check the insulation on the wire between the disconnect switch and the HV power supply.<\/p>\n\n\n\n

    When I left the site at 5:30, I felt like we did some good work.<\/p>\n","protected":false},"excerpt":{"rendered":"

    If one considers paradise an FM35A. Going through another iteration of blown transmitter fuses for WEBE, Bridgeport, CT. Yesterday, I spent the afternoon examining the transmitter and found several interesting things: I checked and re-tightened all of the mains connections.  Apparently, this is an old problem, as the Allen screw was tight.  Interestingly, the fuse … Continue reading All is not well in Paradise<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,4],"tags":[202,28,15],"class_list":["post-2765","post","type-post","status-publish","format-standard","hentry","category-tales-of-disaster","category-tech-stuff","tag-be-35a","tag-fm-site","tag-fm-transmitters"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/2765","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/comments?post=2765"}],"version-history":[{"count":3,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/2765\/revisions"}],"predecessor-version":[{"id":11834,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/2765\/revisions\/11834"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=2765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=2765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=2765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}