for Commercial Satellite Communications in FCC Filing.
This may well be the most significant challenge to date to one of Amateur Radio’s most popular bands. It’s particularly significant for Amateur Radio space communications, as that usage directly competes with this company’s use case — satellite communications.
In DA 25-532, released 2025-06-20, the FCC Space Bureau has accepted a filing from AST SpaceMobile to conduct Telemetry, Tracking, and Command (TT&C) in both space-to-Earth and Earth-to-space communications modes in 430–440 MHz. In the document, AST SpaceMobile is referenced as AST & Science, LLC (AST).
In the US, this 10 MHz band segment comprises the middle third of US Amateur Radio’s (secondary1) allocation of the very popular and heavily used 420–450 MHz (70 cm) band.
Also of interest, and potentially impacting US Amateur Radio operations in the 902–928 MHz band, AST also requests to use 902–928 MHz for space-to-Earth and 902–915 MHz for Earth-to-space communications.
In the US 902–928 MHz band, Amateur Radio has overlapping allocations with unlicensed operations in this very popular and also very heavily used band.
AST’s request mentions a number of bands other than those in use by Amateur Radio.
AST intends to operate a number of satellites in Low Earth Orbit (LEO) with very large antennas that will allow typical mobile telephones to operate normally in areas where there is no terrestrial network coverage, operating on some of the same frequencies as terrestrial carriers.
AST intends to provide its satellite service worldwide:
We are partnering with some of the largest mobile network operators across the globe to reach the biggest audience and improve connectivity worldwide. AST SpaceMobile’s goal is to eliminate the connectivity gaps faced by today’s 5 billion mobile subscribers and bring broadband to approximately half of the world’s population who remain unconnected.
AST SpaceMobile has entered into agreements and understandings with over 50 mobile network operators which collectively service over 3 billion cellular customers.
In the US, AST’s carrier partners are AT&T and Verizon. T-Mobile has announced a partnership with Starlink with similar technology (use of ordinary mobile phones via satellite) called T-Satellite, which will begin commercial operation on 2025-07-23.
FCC Accepting Comments Through 2025-07-21, Reply Comments Through 2025-08-05
FCC DA 25-532 appears to be notification that the FCC Space Bureau has merely accepted AST’s request to use these bands.
The FCC is now accepting comments:
Filing Requirements: Interested parties may file comments on or before July 21, 2025 and reply comments on or before August 5, 2025. Comments and petitions regarding this application should be filed in both the Commission’s Electronic Comment Filing System (ECFS) and in International Communications Filing System (ICFS) under the appropriate file number. 47 CFR §25.154. All filings must refer to SB Docket No. 25-201 and ICFS File No. SAT-MOD-20250612-00145.
Per this mention by AMSAT-DL from 2022, AST has been operating in 430–440 MHz for some time:
AST SPACEMOBILE CONSTELLATION IN 430–440 MHZ BAND
This seems concerning, per this update in 2024 by DB2OS:
Although FCC confessed that the commercial 435 MHz TT&C operations do not fall within the ITU assigned classification for the amateur satellite service, they granted permission…
Additional Coverage of This Story
- ANS-159 AMSAT News Service Weekly Bulletins - 2025-06-08: Satellite Shorts from All Over
The FCC has denied AST Space Mobile’s request to use 430 MHz–440 MHz for telemetry operations, noting “There is no space tracking or space telemetering allocation in the 430–440 MHz frequency range.” (Thanks to AMSAT-DL and the FCC for the information)
Unfortunately, AMSAT did not provide a link to their source for the “denied” claim, and I haven’t seen any additional confirmation. Note that FCC DA 25-532 was dated later (2025-06-20) than AMSAT’s mention.
[Peter Guelzow] DB2OS 2025-06-22 - Bad News for the 70cm Amateur Radio Band
Amateur Radio Daily 2025-06-25 - Satellite Communications Company AST SpaceMoble Seeks Use of 70 cm Amateur Band
AMSAT-UK 2025-06-26 - Use of 430–440 MHz by AST SpaceMobile Constellation
Amateur Radio Newsline Report 2487 for Friday, June 27th, 2025 - Mobile Broadband Provider Seeks Amateur Frequencies For Satellites
In the US, the primary allocation of the 420-450 MHz band is the US government / US military, for a variety of uses, primarily various RADAR systems. Other uses mentioned are telemetry and location systems. ↩︎