[time-nuts] 5061A Problem Child

J. L. Trantham jltran at att.net
Tue Jun 15 23:02:00 EDT 2010


Didier,

Thanks for the obvious solution.  I was thinking about having to build a PLL
to track 90 MHz.

I'll give it a try.  However, I wonder if it will be able to track such a
small deviation.

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Didier Juges
Sent: Tuesday, June 15, 2010 9:55 PM
To: Time-Nuts
Subject: Re: [time-nuts] 5061A Problem Child


Joe,

You probably already have a phase detector capable of receiving your 90 MHz
signal: a good old broadcast FM receiver. Send the audio to the scope or
spectrum analyzer and you should see your 137Hz signal.

Didier

------------------------ Sent from my BlackBerry Wireless thingy while I do
other things... 

-----Original Message-----
From: "J. L. Trantham" <jltran at att.net>
Date: Tue, 15 Jun 2010 21:33:27 
To: 'Discussion of precise time and frequency
measurement'<time-nuts at febo.com>
Subject: Re: [time-nuts] 5061A Problem Child

It's been a long week and it's only Tuesday.

How can I prove that the A3 assembly is, in fact, phase modulating?  In
other words, how can I prove that the 90 MHz signal from the A3 assembly to
J1 on the A4 assembly is phase modulated by the 137 Hz signal?

I have looked at the output of the A3 assembly at the cable to J1 on the A4
assembly (A4P1) with an oscilloscope and a spectrum analyzer with Mod On and
Mod Off and can see no difference.  Likewise, on a functioning unit, I can
not see any difference there either.  Are there proper ways to set up the
scope or SA to focus on this issue?

Short of fabricating a 'phase detector', how can I prove that the A3 unit is
functioning in my 'problem child' unit.  If I have to fabricate a 'phase
detector', how easy (or difficult) is that?

Thanks,

Joe


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