Atomic Clock

Purpose

A local realization of wikipedia:Coordinated Universal Time (UTC), using a Datum LPRO wikipedia:Rubidium_standard. Accuracy is about +/- 1 second in 3,000 years. Time information will be made available publicily via wikipedia:Network Time Protocol (NTP). An in-house display is TBD.

Functional Diagram

Error creating thumbnail: Unable to save thumbnail to destination

Equpiment

Error creating thumbnail: Unable to save thumbnail to destination

DATUM LPRO Rubidium Frequency Standard

Error creating thumbnail: Unable to save thumbnail to destination

HP 5334A Universal Counter

Error creating thumbnail: Unable to save thumbnail to destination

TVB-DIV Frequency Divider

Error creating thumbnail: Unable to save thumbnail to destination

Motorola Oncore UT+ GPS Timing Receiver

Error creating thumbnail: Unable to save thumbnail to destination

Motorola GPS Antenna ANT1A

Software

• NTP

Notes

User:Kuroishi, aka Doorman Dave gave his support to this project on 2015-03-08.

The LPRO controller is currently not implement and not required for use. It will use an Arduino to monitor BITE (self test), LAMP VOLT, XTAL V MON and allow external C-Field control, to adjust the atomic resonance frequency and keep in sync with UTC.

The webcam and counter are for ongoing comparisons between the local frequency standard and GPS.

The Oncore UT+ timing receiver is accurate to 50ns, which is about how long it takes light to travel 50 feet.

Additional Information

• BIPM - time International Bureau of Weights and Measures, "the intergovernmental organization through which Member States act together on matters related to measurement science and measurement standards."

• NIST Time and Frequency Division

• LeapSecond.com "A web site dedicated to precise Time & Frequency"

• time-nuts mailing list thread about OCXO vs GPSDO