So, I guess the main question is, in the absence of something like the 85671A package or mine, how _exactly_ are you turning the dBc/Hz values you get from (say) the 8561E into your ~-120 dBc/Hz numbers? Let's hear the step-by-step procedure on that, and the problem should reveal itself.
One good thing is that these measurements are generally not limited by the SA's signal-to-noise ratio, either RF noise or LO noise. The LNA overcomes the RF noise figure, and the carrier suppression associated with the baseband conversion takes reciprocal mixing off the table. -- john, KE5FX > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of [EMAIL PROTECTED] > Sent: Sunday, January 06, 2008 2:33 PM > To: time-nuts@febo.com > Subject: Re: [time-nuts] 35601A as stand-in for 11848A ? > > > > > In a message dated 1/5/2008 16:31:23 Pacific Standard Time, > [EMAIL PROTECTED] > writes: > > >Are you using my PN software, or your own? If it's mine, what are you > >plugging into the "Noise Response" field? > > >-- john, KE5FX > Hi John, > > I am running this on two instruments: an Audio Precision II Audio > analyzer > (in FFT mode) and an Agilent 8561E. The 8561E has a lower limit > of about 30Hz, > so that unit is a bit limited. It's signal to noise ratio is also not as > good as the APII system. The AP FFT analyzer is limited to ~20KHz > offsets > though, which is OK I am mostly interested in the PN <10KHz. > > bye, > Said > > > _______________________________________________ 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.