The FRU is a state of the art, high-precision frequency standard capable of outputting ten isolated precision 10MHz frequency reference outputs. The FRU uses an internal GPS receiver to control a precision oscillator with accuracy up to 1 x 10-12 and excellent short term stability. The FRU meets the frequency stability requirements of MIL-STD- 188-164A for SHF terminals. A particular feature of the FRU is the ultra-high isolation (>100dB) between the 10MHz outputs, eliminating interaction between 10MHz outputs when they are loaded/unloaded. The FRU incorporates a high-sensitivity 12 channel GPS receiver.
Dual Ethernet ports are used for both monitoring/control of the FRU using Simple Network Monitoring Protocol (SNMP) as well as providing Network Time Protocol (NTP) to clients.A Brandywine supplied user application may also be used to provide a Graphical User Interface to the FRU.The FRU is available is a number of configurations to support specific applications. A mobile application version features a special vibration isolated oscillator that provides isolation of the reference source from portable generator induced phase noise. The High Performance version uses a rubidium oscillator. A SAASM GPS receiver is available for military applications.