Remember that any instrument that displays phase noise as ℒ(f) is subject to the small-angle constraint, and that includes the 5120A and other gear in its category. Any amount of PM that shows up at -26 dBc/Hz at 10 kHz is definitely not a "small angle" effect. See page 40-43 of http://cp.literature.agilent.com/litweb/pdf/N9068-90005.pdf , for example.
-- john Miles Design LLC > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts- > boun...@febo.com] On Behalf Of Azelio Boriani > Sent: Monday, January 14, 2013 7:33 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] 5120A and PM singal > > Should the peak level be at 10MHz? Why 10KHz? 10KHz is the delta from the > carrier: 10MHz plus or minus 10KHz. Moreover, 1Hz is 2*pi*Rad, 1Rad should > be 1Hz/(2*pi). > > On Mon, Jan 14, 2013 at 11:35 AM, Filip Amator > <filip.ama...@gmail.com>wrote: > > > Hello, > > > > I made a simple measurement using Symmetricon 5120A phase noise > > measurement set and a Marconi 2024 signal generator and I don't > > understand the results. I measured the phase noise of 10 MHz signal > > with 1 Rad phase modulation at 10 kHz, and I got from mesurement peak > > at 10 kHz with level about -26dBc/Hz. According to the current > > definition of dBc/Hz, the value of -26dBc/Hz should be considered as a > > -26dB of modulation relative to 1 Rad. But I would expect that the > > peak level will be at 0 dBc at 10 kHz. Does anyone knows how to > > explain this difference? > > > > > > Filip Ozimek > > > > _______________________________________________ > > 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.