[time-nuts] 5061A Problem Child

Robert Benward rbenward at verizon.net
Wed Jun 16 00:21:34 EDT 2010


A VHF scanner might work as well.  Use a scope on the audio.  Alternately, I have purchased modulation analyzers real 
cheap on EBAY.

Bob


----- Original Message ----- 
From: "Didier Juges" <didier at cox.net>
To: "Time-Nuts" <time-nuts at febo.com>
Sent: Tuesday, June 15, 2010 10:54 PM
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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