[time-nuts] Setting Rubidium to match GPS source

Rob Kimberley rk at timing-consultants.com
Fri Sep 28 04:19:42 EDT 2007

Hi Pete,

Please send me details off list, and please take no notice of "know it alls"
who berate anything that doesn't meet their level of electronic
understanding! Actually I find negative comments and put downs like that
somewhat nauseating in a group that supports all levels of interest from
newbies to 40 year professionals.

Have fun!


Rob Kimberley

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Pete
Sent: 28 September 2007 00:38
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Setting Rubidium to match GPS source

); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+rk=timing-consultants.com at febo.com RETRY


The 3575A does NOT have adequate phase resolution to set an Rb
source to match a GPSDO. A few, now rather old, phase meters were
sold for this purpose, but they used a strip chart recorder to average
phase shift over 1 to 24 hour measurement times & required great
investments of time to use.

I proposed a 1KHz heterodyne scheme for this very purpose on this
list a few months ago. The scheme took a few hits for lack of state-
of-the-art performance, but I'm still using it without suffering any
disappointments. It does require you to have a few items of test
equipment (readily available on eBay) which not everyone has &
it requires some circuit construction using readily available parts.
Except you must wind a couple of 5mH inductors on your own.

Contact me off-list if you want more details.

Pete Rawson

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