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-boun...@febo.com [mailto:time-nuts-boun...@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" <jlt...@att.net> Date: Tue, 15 Jun 2010 21:33:27 To: 'Discussion of precise time and frequency measurement'<time-nuts@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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
