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Principles of Opera on

The following block diagrams depict the opera on of the AR-51-07. The unit includes Rubidium Standard and accepts Input from internal

GPS receiver, external 1PPS or external TOD (H.Q). All outputs are derived from the internal Rubidium Clock, which is phase locked by a

digital PLL to the selected input. Thus, the Rubidium Clock - frequency and me - follows the GPS on the long term average. If GPS recep on

is lost for short or long periods of me the Rubidium Clock shall maintain accurate me and frequency with no phase interrup on.

Data flow & Inputs Selec on

Rubidium-GPS D-PLL and Inputs

Typical Performance Plots

Typical me error fluctua ons when disciplined to GPS

Typical me error in Holdover (without GPS)

Typical Performance Plots

Rev 1.0 Oct 2014