[time-nuts] Setting Rubidium to match GPS source

John Franke jmfranke at cox.net
Thu Sep 27 19:54:12 EDT 2007

I would like to see the details.

John  WA4WDL

----- Original Message ----- 
From: "Pete" <peterawson at earthlink.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Thursday, September 27, 2007 7:37 PM
Subject: Re: [time-nuts] Setting Rubidium to match GPS source

> Chris,
> 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.
> Regards,
> Pete Rawson
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