Frequency Electronics

Frequency Electronics, Inc. (FEI) is a U.S.-based manufacturer of precision timing, frequency control, and synchronization products, serving defense, space, aerospace, government, and commercial markets since 1961. The company develops technologies that provide reliable time and frequency references for critical systems across land, sea, air, and space.

Its products include rubidium atomic frequency standards and space-qualified clocks for satellite payloads, GPS reference systems, and timing solutions for GPS-denied environments. FEI also supplies defense timing and synchronization systems for military platforms and C5ISR and JADC2 applications. Its microwave modules and subsystems support applications such as electronic warfare, radar, signals intelligence, and 5G, with RF products operating at frequencies up to 67 GHz. For communications networks, FEI offers synchronization technologies including IEEE 1588 PTP, NTP, Synchronous Ethernet, and DOCSIS timing.

Through its FEI-Zyfer and FEI-Colorado businesses, the company also provides GPS positioning, navigation, timing, and frequency reference systems, along with quantum solutions and time-and-frequency engineering. FEI supports procurement for defense programs, government agencies, defense primes, and commercial space customers.