{"id":3441,"date":"2025-06-26T12:08:47","date_gmt":"2025-06-26T16:08:47","guid":{"rendered":"https:\/\/necoram.com\/09132025septtangovictor98\/use-of-430-440-mhz-by-ast-spacemobile-constellation\/"},"modified":"2025-06-26T12:08:47","modified_gmt":"2025-06-26T16:08:47","slug":"use-of-430-440-mhz-by-ast-spacemobile-constellation","status":"publish","type":"post","link":"https:\/\/necoram.com\/09132025septtangovictor98\/use-of-430-440-mhz-by-ast-spacemobile-constellation\/","title":{"rendered":"Use of 430-440 MHz by AST SpaceMobile constellation"},"content":{"rendered":"

Use of 430-440 MHz by AST SpaceMobile constellation<\/h2>\n

<\/p>\n

\"Image<\/a><\/p>\n

Image by PE0SAT of 435.900 MHz downlink received Sept 12, 2024<\/p>\n<\/div>\n

AST & Science LLC (AST SpaceMobile) currently have five Bluebird satellites, launched 12 September 2024, in Low Earth Orbit using the amateur radio 430-440 MHz band, see
\nhttps:\/\/community.libre.space\/t\/asts-bluebird-1-5\/12255<\/a><\/p>\n

These amateur frequencies are used for the uplink and downlinks with up to 50 kHz bandwidth 430.5, 432.3, 434.1, 435.9 and 439.5 MHz.<\/p>\n

AST say they have ground stations in Australia, Argentina, Bulgaria and Korea.<\/p>\n

They are planning to launch a further 243 satellites<\/strong> also using 430-440 MHz and in February submitted a request for use of those amateur frequencies to the FCC Space Bureau
\nhttps:\/\/apps.fcc.gov\/els\/GetAtt.html?id=371448&x=.<\/a><\/p>\n

In April the FCC responded with these questions to AST
\nhttps:\/\/forum.amsat-dl.org\/cms\/index.php?file-download\/7502\/<\/a><\/p>\n

AST\u2019s responded in May to the FCC questions regarding their filing, see answer regarding IARU
\nhttps:\/\/apps.fcc.gov\/els\/GetAtt.html?id=376295<\/a><\/p>\n

The Interference Analysis Report submitted by AST in their answer doesn\u2019t mention the interference that would be caused from the 430-440 MHz transmissions, see
\nhttps:\/\/apps.fcc.gov\/els\/GetAtt.html?id=373778&x=.<\/a><\/p>\n

FCC issued this Public Notice in June \u2013 comment to FCC by July 21
\nhttps:\/\/www.fcc.gov\/document\/space-bureau-accepts-filing-ast-science-llc-application<\/a><\/p>\n

For some background on FCC attitudes see the interview the Chief of the FCC\u2019s Space Bureau, Jay Schwarz, gave to the American Enterprise Institute (AEI). It primarily concerns the ITU-R EPFD limits but it reflects the new thinking at the FCC about getting rid of \u201coutdated assumptions about system design and spectrum use\u201d<\/em>
\nhttps:\/\/www.aei.org\/technology-and-innovation\/how-the-fcc-space-bureau-is-rethinking-the-rules-of-space\/<\/a><\/p>\n

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Get The Details…<\/a><\/p>\n

Editor <\/p>\n

AMSAT-UK<\/p>\n","protected":false},"excerpt":{"rendered":"

AST & Science LLC (AST SpaceMobile) currently have five Bluebird satellites, launched 12 September 2024, in Low Earth Orbit using the amateur radio 430-440 MHz band, see https:\/\/community.libre.space\/t\/asts-bluebird-1-5\/12255 These amateur frequencies are used for the uplink and downlinks with up \u2026 Continue reading \u2192<\/span><\/a>Read More →<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[18],"tags":[20,19],"class_list":["entry","author-admin","has-excerpt","post-3441","post","type-post","status-publish","format-standard","category-amsat","tag-amsat","tag-communication"],"_links":{"self":[{"href":"https:\/\/necoram.com\/09132025septtangovictor98\/wp-json\/wp\/v2\/posts\/3441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/necoram.com\/09132025septtangovictor98\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/necoram.com\/09132025septtangovictor98\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/necoram.com\/09132025septtangovictor98\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/necoram.com\/09132025septtangovictor98\/wp-json\/wp\/v2\/comments?post=3441"}],"version-history":[{"count":0,"href":"https:\/\/necoram.com\/09132025septtangovictor98\/wp-json\/wp\/v2\/posts\/3441\/revisions"}],"wp:attachment":[{"href":"https:\/\/necoram.com\/09132025septtangovictor98\/wp-json\/wp\/v2\/media?parent=3441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/necoram.com\/09132025septtangovictor98\/wp-json\/wp\/v2\/categories?post=3441"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/necoram.com\/09132025septtangovictor98\/wp-json\/wp\/v2\/tags?post=3441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}