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AS133  Rubidium Frequency Standard with Anti-Spoofing Technology

AS133  Rubidium Frequency Standard with Anti-Spoofing Technolgy Image

The AS133 family of products is AccuBeat’s new generation multi-functional Rubidium Frequency Standard combined with our proprietary Anti-Spoofing software.  The AS133 family of products includes several different sub versions and is one of the smallest atomic standards available today, where the accuracy and stability are derived from a quantum transition that occurs in a free rubidium atom. The unit utilizes a unique advanced technology, which allows reducing the unit’s size without sacrificing performance.

AS133 Specifications pdf

AS133 Specifications

The AS133 is comprised of a unique DFLL (Digital Frequency Lock Loop) where a high performance crystal oscillator is locked to the rubidium atomic line using an embedded microprocessor and a special patented algorithm. The algorithm optimizes the performance vs. external disturbances, improves temperature stability, and enables very fine digital frequency control.


Please refer to the Datasheet for a detailed specification and a list of the different customized versions available. Please contact us if you require a unique specification not currently listed.


AS133 special modes of operation:

Disciplined to an external 1PPS: this improves the long-term-stability, the accuracy, and synchronizes the phase of the 1PPS output to the 1PPS input.

Power-saving modes (options): for applications where power is limited, the AS133 offers several power saving modes that can be selected by the user.

Mixed Mode (Option) – in this mode the physics package, which is the main power consumer, is turned on and off periodically, allowing lower average power consumption. In this mode the internal OCXO supplies accurate frequency calibrated to the atomic clock frequency. Although performance is slightly reduced, power consumption is significantly lower in this mode.

OCXO Disciplined Mode (Option) – this mode implements an OCXO disciplining to external 1PPS (with Physics Package shut-down) and consumes even lower power of about 1.8 W.

Key Features

AccuBeat’s proprietary Anti-Spoofing solution

Long-term-stability: 5E-11/month

2E-12 frequency accuracy & 100nSec 1PPS accuracy Relative to 1PPS input when disciplined

Short term stability: 5E-12 @ 100s

Phase noise: -150dBc/Hz @10kHz

Outputs: 10 MHz and 1PPS

Supply voltage: 15 VDC / 12 VDC (option)

Steady state power < 8.25W

Power-saving mode  < 1.8W Steady State (option)

Size: 77 x 77 x 25.4 mm (3” x 3” x 1”)


GNSS Denied Scenarios

Secure Communication


Software Radio

Test Equipment

Cellular Base Stations

TV Stations, HDTV

Scientific Equipment


Contact us to discuss with one of our experts the best off the shelf or fully customized timing solution for your next project.

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