Designed to operate in conjunction with GPS or compass satellite signal, Model IQFR-100 delivers frequency accuracy of < ±1E-12 after 24 hr of stable satellite signal lock. In event of signal loss, unit maintains accuracy of better than 5E-11 until restoration of lock due to internal reference oscillator. Housed in 1U rack mountable cabinet, IQFR-100 provides two 10 MHz square wave outputs, 2 square wave outputs at 2.048 MHz, and two 1 PPS impulse outputs with holdover specification of ≤1.5 µs.