Also known as: FCC, Federal Communications Commission
The Federal Communications Commission (FCC) is the United States regulator of interstate radio, television, wire, satellite, and cable.1 It allocates US spectrum, licenses users, and sets the technical rules that non-federal transmitters must obey.2
Overview
Created by the Communications Act of 1934, the FCC is an independent US government agency overseen by Congress and run by five commissioners. It regulates all non-federal use of the radio spectrum — commercial, public-safety, amateur, and consumer — while federal government use (military, and much of aviation and law enforcement) is coordinated separately by the NTIA. The two share the spectrum under a national plan that itself sits inside the international allocations set by the ITU. The FCC’s technical rules live in Title 47 of the Code of Federal Regulations, whose parts every SDR user eventually meets: Part 15 governs unlicensed devices (Wi-Fi, Bluetooth, ISM-band gadgets), Part 90 covers private land-mobile radio (the world of public-safety trunked-radio, business, and P25 systems), Part 97 covers the amateur service, and Part 22/24 cover cellular and PCS.
Beyond allocating bands, the FCC certifies equipment, issues licences, and sets emission masks and power limits. One of its most consequential land-mobile actions was the narrowbanding mandate, which required VHF/UHF business and public-safety licensees to move from 25 kHz to 12.5 kHz channel spacing (or equivalent efficiency). That efficiency pressure was a strong tailwind for digital systems: 12.5 kHz DMR and NXDN, and the 6.25 kHz-equivalent efficiency of P25 Phase 2 TDMA, all fit the narrowband world the FCC pushed toward. The commission works with US standards bodies and user groups — TIA writes the P25 standards, APCO International represents public-safety users, and the ARRL represents amateur operators — but the FCC itself sets the binding rules.
Relevance to SDR
Almost everything an SDR user in the United States tunes to is shaped by an FCC decision: the channel plan, the modulation efficiency, the power level, and whether a band is licensed or open. Knowing which Part governs a service tells you what to expect — a Part 90 public-safety channel is likely narrowband digital voice, while a Part 15 device in the 902–928 MHz ISM band might be a LoRa sensor or a cordless phone. The narrowbanding history explains why so much of the modern land-mobile spectrum you scan is digital rather than analog FM.
For reception specifically, the FCC’s rules matter in a different way: in the US, the Communications Act generally permits listening to most radio transmissions but restricts divulging or using the contents of certain communications, and intercepting some services (notably cellular) is explicitly barred. What you may lawfully receive and what you may do with it varies by jurisdiction, so the FCC is the reference point for US users the way Ofcom is for the UK. GopherTrunk is a receiver and decoder and implements no FCC logic itself, but the systems it decodes exist in the shape the FCC’s band plans and narrowbanding rules gave them — see the legal & ethical monitoring lesson before you tune.
Sources
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Federal Communications Commission — Wikipedia, for the agency’s history, structure, and regulatory remit. ↩
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Federal Communications Commission — the FCC’s official site, for US spectrum allocation, licensing, equipment certification, and the Part rules. ↩