[time-nuts] Setting Rubidium to match GPS source
rk at timing-consultants.com
Fri Sep 28 04:19:42 EDT 2007
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.
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.
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