\n<\/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<\/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<\/p>\n In April the FCC responded with these questions to AST<\/p>\n AST\u2019s responded in May to the FCC questions regarding their filing, see answer regarding IARU<\/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<\/p>\n FCC issued this Public Notice in June \u2013 comment to FCC by July 21<\/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><\/p>\n<\/p><\/div>\n