MPD Fully Functioning During the Covid-19 Emergency

We just thought we’d let all of you know that it is business as usual at Octagon Communications and MPD. All necessary precautions have been taken, and, as several of our staffers already work remotely, the office is open for business until we are told otherwise.

The March issues of MPD and MMD will arrive on schedule, and of course our website and the digital edition will continue to be available.

Feel free to contact any of us with questions or concerns!

We hope that you and your families are safe and healthy.

Home Featured Articles A Different Approach to Control of a Rubidium–Based GNS Disciplined Frequency Standard

A Different Approach to Control of a Rubidium–Based GNS Disciplined Frequency Standard


by Precise Time and Frequency, Inc.

Many applications utilizing precision frequency references use an OCXO as the local oscillator to provide improved accuracy and stability, however it is not uncommon to require the additional stability and holdover performance provided by incorporating a rubidium atomic clock as the local oscillator in a GNS disciplined standard.

Many of these systems also require a precision timing signal (e.g. one pulse per second or 1PPS) to synchronize in the time domain to UTC (Universal Time Coordinated).

Disciplining (or “steering”) either an OCXO or a rubidium oscillator to UTC while at the same time preserving the inherent excellent stability performance of the rubidium is not a trivial task. Recent development work on a new product at PTF yielded the opportunity to consider a different strategy for control implementation.

This paper describes both the traditional OCXO control and an alternative method to the more commonly used PID type control loop used for the rubidium.


This article contains formulas. To make it easier to read please click here for the pdf version of the article.