{"id":10207,"date":"2019-07-09T08:00:19","date_gmt":"2019-07-09T12:00:19","guid":{"rendered":"http:\/\/www.engineeringradio.us\/blog\/?p=10207"},"modified":"2023-03-19T08:25:32","modified_gmt":"2023-03-19T12:25:32","slug":"be-am-tuning-network","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2019\/07\/be-am-tuning-network\/","title":{"rendered":"BE AM tuning network"},"content":{"rendered":"

Occasional reader Scott asked for a picture of the inside of a BE AM output tuning network.\u00a0 I figured it might be helpful to make a short post about it.<\/p>\n

These things are pretty simple; a T network with a capacitive leg to ground.<\/p>\n

\"BE<\/a>
BE AM Output tuning network<\/figcaption><\/figure>\n

This particular unit is for 1230 KHz.\u00a0 I believe the capacitor is frequency determined and they may also use larger inductors for lower frequencies.<\/p>\n

\"BE<\/a>
BE AM output tuning network schematic<\/figcaption><\/figure>\n

The inductors are Kintronic LV-15-20 (15uH 20 amp) and the capacitor is 0.0018 uF CDE 6KV 5.6 amp.<\/p>\n

The issue with this particular unit is dirt.\u00a0 The inductors have round metal plates that roll along the inductor coil to make the variable inductor tap.\u00a0 Dirt has accumulated on the coil turns and on the inside of the plates.\u00a0 This, in turn, causes arcing anytime the Tune or Load controls are moved.\u00a0 A thorough cleaning should take care of the problem.<\/p>\n","protected":false},"excerpt":{"rendered":"

Occasional reader Scott asked for a picture of the inside of a BE AM output tuning network.\u00a0 I figured it might be helpful to make a short post about it. These things are pretty simple; a T network with a capacitive leg to ground. This particular unit is for 1230 KHz.\u00a0 I believe the capacitor … Continue reading BE AM tuning network<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":10214,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[87,284,32],"class_list":["post-10207","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech-stuff","tag-am","tag-am-tower","tag-am-transmitters"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/10207","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=10207"}],"version-history":[{"count":4,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/10207\/revisions"}],"predecessor-version":[{"id":11053,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/10207\/revisions\/11053"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media\/10214"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=10207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=10207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=10207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}