| FAA |
Federal Aviation Administration (USA) |
| FAGS |
Federation of Astronomical and Geophysical Services |
| FAST |
Fundamental Astronomy by Space Techniques Consortium |
| FB |
Base station (in a mobile radio system) |
| FBW |
Fractional Bandwidth |
| FCC |
Federal Communications Commission (USA) |
| FDD |
Frequency Division Duplex |
| FDP |
Fraction of Degradation of Performance |
| FDMA |
Frequency Division Multiple Access |
| FEC |
Forward Error Correction |
| FM |
(Working Group) Frequency Management (ECC) |
| FM |
Frequency Modulation |
| FMCS |
Frequency Management Sub-Committee (NATO) |
| FPLMTS |
Future Public Land Mobile Telecommunication System (see UMTS) |
| FS |
Fixed Service |
| FSK |
Frequency-Shift Keying |
| FSS |
Fixed Satellite Service |
| FT |
France Télécom (F) |
| FWA |
Fixed Wireless Access |
| FX |
Fixed Service |
Committee on Radio Astronomy Frequencies