{"id":8779,"date":"2015-08-27T18:20:59","date_gmt":"2015-08-27T22:20:59","guid":{"rendered":"http:\/\/www.engineeringradio.us\/blog\/?p=8779"},"modified":"2024-03-14T20:10:57","modified_gmt":"2024-03-15T00:10:57","slug":"the-gates-air-fax-10","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2015\/08\/the-gates-air-fax-10\/","title":{"rendered":"The Gates Air FAX-10"},"content":{"rendered":"\n

This is the first one of these transmitters that I have installed. This particular unit is analog only, but there is lots of room left over for an HD exciter if need be.<\/p>\n\n\n\n

\"GatesAir<\/a>
GatesAir Flexiva FAX-10, 10.000-watt FM transmitter<\/figcaption><\/figure>\n\n\n\n

The size of a 10 KW FM transmitter these days is pretty small, basically taking up the equivalent of one rack. This is a relatively small transmitter room, the old tube transmitter basically took up the entire room. With this unit, there is room to install a full power spare, if that was desired.<\/p>\n\n\n\n

\"GatesAir<\/a>
GatesAir Flexiva series RF modules.<\/figcaption><\/figure>\n\n\n\n

RF modules use LDMOSFET devices, each module has a power output of approximately 1,600 watts.<\/p>\n\n\n\n

\"GatesAir<\/a>
GatesAir Flexiva FAX10 power amp section<\/figcaption><\/figure>\n\n\n\n

There are eight power amp modules and seven switching power supplies.<\/p>\n\n\n\n

\"GatesAir<\/a>
GatesAir FAX10 transmitter on the air<\/figcaption><\/figure>\n\n\n\n
\"GatesAir<\/a>
GatesAir FAX10, licensed transmitter power output<\/figcaption><\/figure>\n\n\n\n

One issue at this site, there is no reliable three-phase power available.  There was a three-phase open delta, but man, that thing scares me a little bit.  Since this is a single-phase setup, I was curious to know what the current draw on each leg was at full power. I measured with my clamp-on ammeter; 54.3 Amps at 120 volts, or 6516 watts per leg. Overall power draws 13,032 making the AC to RF efficiency 65.2%. VSWR calculates out to 1.21, which is not great.  I think the antenna could use a little bit of tuning love.<\/p>\n","protected":false},"excerpt":{"rendered":"

This is the first one of these transmitters that I have installed. This particular unit is analog only, but there is lots of room left over for an HD exciter if need be. The size of a 10 KW FM transmitter these days is pretty small, basically taking up the equivalent of one rack. This … Continue reading The Gates Air FAX-10<\/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":[337],"tags":[15],"class_list":["post-8779","post","type-post","status-publish","format-standard","hentry","category-installations","tag-fm-transmitters"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/8779","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=8779"}],"version-history":[{"count":6,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/8779\/revisions"}],"predecessor-version":[{"id":11192,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/8779\/revisions\/11192"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=8779"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=8779"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=8779"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}