{"id":12625,"date":"2024-02-13T14:25:30","date_gmt":"2024-02-13T18:25:30","guid":{"rendered":"https:\/\/www.engineeringradio.us\/blog\/?p=12625"},"modified":"2024-02-13T14:25:32","modified_gmt":"2024-02-13T18:25:32","slug":"the-nautel-j-1000","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2024\/02\/the-nautel-j-1000\/","title":{"rendered":"The Nautel J-1000"},"content":{"rendered":"\n

I Finished up this installation of a J-1000 in Brookfield, Connecticut for Nossa Radio. That is a Portuguese broadcaster that owns three other stations in the US.<\/p>\n\n\n\n

\"\"
WINE 940 KHz Brookfield, CT<\/figcaption><\/figure>\n\n\n\n

These Nautels are fairly simple affairs; a controller and two RF amps with incumbent power supplies. <\/p>\n\n\n\n

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Nautel AM-RF and AC mains surge suppressor<\/figcaption><\/figure>\n\n\n\n

Be sure to install the surge suppressor that comes with the transmitter. <\/p>\n\n\n\n

The J-1000 is replacing the 43-year-old Harris MW-1A which will function as a backup. Like all new transmitter installations; some things must be done to complete the job.<\/p>\n\n\n\n

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Harris MW1A<\/figcaption><\/figure>\n\n\n\n

Harmonic measurements out to about the 5th or 6th harmonic need to be documented and compliant with NRSC-2 (AM mask requirements). Although NRSC-2 measurements are required, I don’t see how they can enforce that specification after AM HD radio came into being. Nevertheless, it was measured and passed. With the station carrier power of 680 watts, I used the RF monitor port on the back of the transmitter to make the measurement. Otherwise, I would need to find an empty field somewhere 1 KM away and stand in the middle of it to reduce all of the electrical noise.<\/p>\n\n\n\n

\"\"
Spectrum Mask from a Spectrum Analyzer<\/figcaption><\/figure>\n\n\n\n

The NRSC-2 mask is mainly a function of High-Frequency limitation in the audio processor\u2014certain transmitters, like the aforementioned MW1A did make some contributions to out-of-tolerance measurements.<\/p>\n\n\n\n

\"\"
NRSC-2C AM mask requirements<\/figcaption><\/figure>\n\n\n\n
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Harmonics measurements<\/figcaption><\/figure>\n\n\n\n
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WINE folded unipole feed point<\/figcaption><\/figure>\n\n\n\n

The antenna is a skirted tower that has many other services colocated on it. At the top is WRKI.<\/p>\n\n\n\n

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WINE ATU<\/figcaption><\/figure>\n\n\n\n
\"\"
WINE daytime coverage map<\/figcaption><\/figure>\n\n\n\n

Driving away from this site, I would have to agree with the predicted contour map above, at least on the highway. I think it may be a bit different driving around in town.<\/p>\n","protected":false},"excerpt":{"rendered":"

I Finished up this installation of a J-1000 in Brookfield, Connecticut for Nossa Radio. That is a Portuguese broadcaster that owns three other stations in the US. These Nautels are fairly simple affairs; a controller and two RF amps with incumbent power supplies. Be sure to install the surge suppressor that comes with the transmitter. … Continue reading The Nautel J-1000<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":12666,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[337],"tags":[87,33,245],"class_list":["post-12625","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-installations","tag-am","tag-am-towers","tag-am-transmitter"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/12625","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=12625"}],"version-history":[{"count":10,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/12625\/revisions"}],"predecessor-version":[{"id":12670,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/12625\/revisions\/12670"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media\/12666"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=12625"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=12625"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=12625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}