{"id":5461,"date":"2012-08-09T08:00:48","date_gmt":"2012-08-09T12:00:48","guid":{"rendered":"http:\/\/www.engineeringradio.us\/blog\/?p=5461"},"modified":"2012-08-02T17:46:20","modified_gmt":"2012-08-02T21:46:20","slug":"details","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2012\/08\/details\/","title":{"rendered":"Details"},"content":{"rendered":"

I found this small, yet very important detail on a DB-37 connector attached to the back of a Nautel V-1 transmitter:<\/p>\n

\"DB-37<\/a>
DB-37 connector for Nautel V-1 transmitter<\/figcaption><\/figure>\n

The black wire is the ground wire and the orange wire is the remote RF off command.\u00a0 A closer view:<\/p>\n

\"DB<\/a>
DB 37 connector from Nautel V-1 transmitter<\/figcaption><\/figure>\n

The transmitter had been shutting down unexpectedly since it was installed.\u00a0 When these shutdowns occurred, there was no overload, no fault, no power interruption or other indication of a problem.\u00a0 When the RF on command was issued, the transmitter would turn back on and run with normal readings until it shut down again.\u00a0 It was a bit of a mystery; the transmitter was removed from its mountain top home and hauled back to the shop to be repaired.\u00a0 It was connected to all sorts of test equipment and studied intently for many days.\u00a0 Still, the problem could not be replicated in the shop.<\/p>\n

Then the transmitter was hauled back to its mountain top transmitter site and re-installed.\u00a0 It ran well for about a month and then started going off again.\u00a0 This time somebody looked at the event log and noticed that a “Remote RF off command” was being issued at the same time the transmitter would shut down.\u00a0 Ahhh, the missing bit of critical data.\u00a0 That prompted me to take apart the DB-37 connector used for the remote control interface.\u00a0 The problem was obvious as soon as I removed the hood.<\/p>\n

Sometimes the most valuable piece of test gear is the venerable Mk I, Mod 0, EYEBALL.<\/p>\n

I unsoldered the ground lead and put some heat shrink over the connection to the DB-37.\u00a0 Hopefully, that will take care of it.<\/p>\n","protected":false},"excerpt":{"rendered":"

I found this small, yet very important detail on a DB-37 connector attached to the back of a Nautel V-1 transmitter: The black wire is the ground wire and the orange wire is the remote RF off command.\u00a0 A closer view: The transmitter had been shutting down unexpectedly since it was installed.\u00a0 When these shutdowns … Continue reading Details<\/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":[4],"tags":[15],"class_list":["post-5461","post","type-post","status-publish","format-standard","hentry","category-tech-stuff","tag-fm-transmitters"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/5461","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=5461"}],"version-history":[{"count":8,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/5461\/revisions"}],"predecessor-version":[{"id":5475,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/5461\/revisions\/5475"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=5461"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=5461"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=5461"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}