{"id":13260,"date":"2025-02-01T09:43:02","date_gmt":"2025-02-01T13:43:02","guid":{"rendered":"https:\/\/www.engineeringradio.us\/blog\/?p=13260"},"modified":"2025-02-01T20:00:39","modified_gmt":"2025-02-02T00:00:39","slug":"baltimore-public-radio-gets-a-new-flx20","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2025\/02\/baltimore-public-radio-gets-a-new-flx20\/","title":{"rendered":"Baltimore Public Radio gets a new FLX20"},"content":{"rendered":"\n

Another liquid-cooled GatesAir transmitter installation was completed for WYPR, Baltimore, MD. This unit replaced a Continental 816 which had a long life.<\/p>\n\n\n\n

The area around the transmitter site is not the best neighborhood. The building was formerly the WBAL-TV transmitter site and was built circa 1947. <\/p>\n\n\n\n

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WYPR transmitter site<\/figcaption><\/figure>\n\n\n\n
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Original four-legged Blaw Knox self-supporting tower from the WBAL-TV days<\/figcaption><\/figure>\n\n\n\n
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Pump station and HTF tubing<\/figcaption><\/figure>\n\n\n\n
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Wall-mounted heat exchanger<\/figcaption><\/figure>\n\n\n\n
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FLX-20 transmitter<\/figcaption><\/figure>\n\n\n\n

The transmitter room is a little tight, so it was difficult to get a good shot of the front of the unit.<\/p>\n\n\n\n

The station is running HD Radio with -10 dBc.<\/p>\n\n\n\n

This site has a strange 3-phase delta AC power configuration. The middle leg is at ground potential, and the other legs all measure 240 VAC to ground. I’ve never encountered that before. This is known as a corner grounded Delta, which gets rid of the high leg associated with most closed 3-phase delta systems.<\/p>\n\n\n\n

Ultimately, all the leg-to-leg measurements are 240 volts, so the power supplies are satisfied. With these transmitters, the phase rotation does not matter because there are no actual 3-phase loads in the transmitter.<\/p>\n\n\n\n

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Inventory control, Home Depot Reisterstown Road, Baltimore, MD<\/figcaption><\/figure>\n\n\n\n

The sign says “Free Tools.” <\/p>\n","protected":false},"excerpt":{"rendered":"

Another liquid-cooled GatesAir transmitter installation was completed for WYPR, Baltimore, MD. This unit replaced a Continental 816 which had a long life. The area around the transmitter site is not the best neighborhood. The building was formerly the WBAL-TV transmitter site and was built circa 1947. The transmitter room is a little tight, so it … Continue reading Baltimore Public Radio gets a new FLX20<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":13275,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[337],"tags":[256,303],"class_list":["post-13260","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-installations","tag-fm-transmitter","tag-hd-radio"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/13260","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=13260"}],"version-history":[{"count":5,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/13260\/revisions"}],"predecessor-version":[{"id":13274,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/13260\/revisions\/13274"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media\/13275"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=13260"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=13260"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=13260"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}