[time-nuts] 5061A Problem Child
J. L. Trantham
jltran at att.net
Wed Jun 16 03:02:00 UTC 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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