{"id":12398,"date":"2023-09-25T15:00:36","date_gmt":"2023-09-25T19:00:36","guid":{"rendered":"https:\/\/www.engineeringradio.us\/blog\/?p=12398"},"modified":"2023-09-28T06:55:37","modified_gmt":"2023-09-28T10:55:37","slug":"the-rhode-schwarz-thr9-transmitter","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2023\/09\/the-rhode-schwarz-thr9-transmitter\/","title":{"rendered":"The Rhode Schwarz THR9 transmitter"},"content":{"rendered":"\n

This is part I of II.<\/p>\n\n\n\n

We are in the process of installing an R&S 40 KW liquid-cooled FM transmitter. My first comment; these are well-built units. A quick look at the machining of the parts indicates attention to detail is a key design feature.<\/p>\n\n\n\n

As the price of electricity continues to rise, liquid-cooled transmitters for this power level make a lot of sense.<\/p>\n\n\n\n

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Rhode Schwarz THR9 VHF transmitter<\/figcaption><\/figure>\n\n\n\n

This installation is for Pamal Broadcasting’s WHUD, Peekskill, New York. The site has undergone major upgrades in the last few years. The original 1958 World Tower Utility 80 was replaced a year ago with this Valmont 60X394. Two cell carriers, two translators, and several E911 services are now colocated on the tower.<\/p>\n\n\n\n

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Valmont 60X394 tower, WHUD Peekskill, NY<\/figcaption><\/figure>\n\n\n\n

The transmitter building is also the original cinder block structure from 1958. When it signed on, the station had a Gates FM5B 5 KW transmitter, an RCA BFA-7, 7-bay horizontally polarized antenna with an ERP of 20 KW. In 1970, that antenna was changed out to a 6-bay circularly polarized ERI with a Harris FM20H transmitter, increasing the ERP to 50 KW. As of now, the station has a 4-bay ERI SHP-4-A-C main antenna and the TPO is 28 KW for the same 50 KW ERP. As the station’s power increased, the building became a little bit smaller than optimal. We needed to rearrange some equipment to gain space for the pump station and step-up transformer.<\/p>\n\n\n\n

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Pump Station<\/figcaption><\/figure>\n\n\n\n
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Heat Exchanger<\/figcaption><\/figure>\n\n\n\n

Rhode Schwarz recommended installing a step-up transformer for the incoming AC mains. The power supplies run most efficiently with 400 volts AC.<\/p>\n\n\n\n

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Hammond HPS Sentinel K dry core transformer<\/figcaption><\/figure>\n\n\n\n
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The Rhode Schwarz RF connection to an ERI switchless combiner<\/figcaption><\/figure>\n\n\n\n

We decided to reuse the ERI switchless combiner left over from the Nautel V-40 installation. There are two Nautel V-10 transmitters with a hybrid combiner that are to be used as a backup. We won’t be running this as a combined transmitter operation, it is a way to save money rather than install a separate 3-inch coax switch. I will build a simple control panel to move the combiner position either all the way up (THR9) or all the way down (V-10s).<\/p>\n\n\n\n

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2.5 inch core drilled holes for coolant supply and return<\/figcaption><\/figure>\n\n\n\n

Working on the liquid cooling system. I used a core drill to make the supply and return lines to the outdoor heat exchanger. I made sure that I had the shop vac (with a HEPA filter) running while drilling so that all of the concrete dust was captured. That stuff can get everywhere and has a bad tendency to destroy motor bearings. Whatever plant made these blocks in 1958, they used some hard material. It took a while for my masonry drill to get through them.<\/p>\n","protected":false},"excerpt":{"rendered":"

This is part I of II. We are in the process of installing an R&S 40 KW liquid-cooled FM transmitter. My first comment; these are well-built units. A quick look at the machining of the parts indicates attention to detail is a key design feature. As the price of electricity continues to rise, liquid-cooled transmitters … Continue reading The Rhode Schwarz THR9 transmitter<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":12483,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[337],"tags":[82,215,15],"class_list":["post-12398","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-installations","tag-fm","tag-fm-transmitter-site","tag-fm-transmitters"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/12398","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=12398"}],"version-history":[{"count":10,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/12398\/revisions"}],"predecessor-version":[{"id":12486,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/12398\/revisions\/12486"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media\/12483"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=12398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=12398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=12398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}