{"id":8878,"date":"2015-10-23T08:00:27","date_gmt":"2015-10-23T12:00:27","guid":{"rendered":"http:\/\/www.engineeringradio.us\/blog\/?p=8878"},"modified":"2023-03-19T14:19:32","modified_gmt":"2023-03-19T18:19:32","slug":"the-inglorious-task-of-am-antenna-array-maintenance","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2015\/10\/the-inglorious-task-of-am-antenna-array-maintenance\/","title":{"rendered":"The inglorious task of AM antenna array maintenance"},"content":{"rendered":"

AM radio stations are rough customers. They frequently operate on the margins, both in terms of ratings and revenue. Their transmitter plants are complex and very often have been on a reduced maintenance schedule for years, sometimes decades.\u00a0 Those of us that understand the operation of AM transmitter plants and all their quirky behaviors are getting older.\u00a0 I myself, feel less inclined to drop everything and run off to the AM transmitter site when things go awry.\u00a0 Seldom are such efforts rewarded, much less acknowledged.\u00a0 Station owners are also finding that their previous demands are unrealistic.\u00a0 For example, time was that any work that takes the station off the air had to be done after midnight.\u00a0 These days, I can tell you, I will not be working at your radio station after midnight.\u00a0 You can find somebody else to do that work.<\/p>\n

Thus, today, we took this particular AM station off the air from Noon until 3 pm to diagnose and repair a problem with the four-tower daytime array.\u00a0 Once again, this involved a shift in common point impedance and a drastic change in one tower’s current ratios.<\/p>\n

\"Antenna<\/a>
Antenna Tuning Unit, mice have made a mess<\/figcaption><\/figure>\n

In all fairness to the current owner, this ATU reflects years of neglect. At some point, mice made a home in there and created a mess. The ATU smells of mouse shit, piss, and mothballs.\u00a0 It is full of mouse droppings, grass seeds, and fur.\u00a0 All of the ATUs in this array are in similar condition.<\/p>\n

\"Paper<\/a>
Paper wasp, inside ATU<\/figcaption><\/figure>\n

It was warm enough that the wasps were active, if not a little bit lethargic.<\/p>\n

\"Broken<\/a>
Broken stand-off insulators in ATU<\/figcaption><\/figure>\n

This coil is being held up by the tubing that connects it to other components. When the ATU was built, no nylon or cork bushings were used between the insulators and the wall of the ATU they were mounted on. Heat cycling eventually did all of the insulators in.<\/p>\n

\"Catwalk<\/a>
Catwalk to the other towers<\/figcaption><\/figure>\n

Catwalks to the other towers. At least the swamp grass has been cut this year, it is only four feet tall instead of ten.<\/p>\n

\"Tower<\/a>
Tower base<\/figcaption><\/figure>\n

The tower bases are all elevated above the theoretical maximum water level. The ATUs are also up on stands with platforms build for maintenance access.<\/p>\n

\"ATU<\/a>
ATU Work “platform”<\/figcaption><\/figure>\n

I cannot even blame the current owner, who has to spend considerable money to make repairs and upgrades to this site. It is very difficult and very expensive to catch up with deferred maintenance. Sadly, most AM stations we encounter have similar or worse problems.<\/p>\n

I think it is too late to save many of these AM stations.\u00a0 The technical issues, lack of revenue, perceived poor quality, and lack of good programming are all taking their toll.\u00a0 At this point, the hole is so deep there is no hope of ever getting out.\u00a0 The FCC’s faux interest in “revitalization” followed by two years of stony indifference seems to be a final, cruel joke.<\/p>\n","protected":false},"excerpt":{"rendered":"

AM radio stations are rough customers. They frequently operate on the margins, both in terms of ratings and revenue. Their transmitter plants are complex and very often have been on a reduced maintenance schedule for years, sometimes decades.\u00a0 Those of us that understand the operation of AM transmitter plants and all their quirky behaviors are … Continue reading The inglorious task of AM antenna array maintenance<\/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":[17],"tags":[87,33,18,46],"class_list":["post-8878","post","type-post","status-publish","format-standard","hentry","category-maintenance","tag-am","tag-am-towers","tag-am-transmitter-site","tag-repair-work"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/8878","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=8878"}],"version-history":[{"count":9,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/8878\/revisions"}],"predecessor-version":[{"id":11137,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/8878\/revisions\/11137"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=8878"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=8878"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=8878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}