[time-nuts] M100 hookup information

fre_eng fre_eng at mail.ev1.net
Tue Aug 16 15:27:06 EDT 2005

I am looking for some information on my recently acquired M100. 

The pinouts are labelled on the unit so i have managed to power it up and get lock

I have found out (empirically) that the "lock" signal is an open collector signal, so i now have a lock LED. 

There are 2 analog (lock?) voltages also coming out. What is the maximum voltage from these pins? I want to include a voltmeter to monitor these voltages on the packed module box. What voltage should they be? Midrange?


Dave Robinson

Message: 3
Date: Mon, 15 Aug 2005 23:44:09 -0500
From: Brian Kirby <kirbybq at bellsouth.net>
Subject: Re: [time-nuts] rubidium standard caveats?
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Message-ID: <43016F19.1070001 at bellsouth.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

A  FRK-L or M100, or LPro are good units.  Make sure the buyer throws in 
the I/O connector and a manual.  I beleive the best is the SRS PRS10, it 
cost more, but it has great specs and it has a built in disciplining 
circuit - if it hooked up to a 1 PPS from a timing GPS receiver.

Certain FE5680s should be avoided - some are custom made for the 
cellular industry and they are programmable via DDS.  Nobody has been 
able to supply the RIGHT programing information.  The units are also not 
stock - the pinouts are different then advertised.

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