David, The 10811 linearity may not be that good rail to rail, but how linear is yours over the narrow EFC range you use during a stability measurement? I would expect it to be very good over any given interval of a few or tens of mV.
/tvb ----- Original Message ----- From: "David Hooke" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Monday, July 22, 2013 5:23 AM Subject: [time-nuts] TPLL linearity and other questions > > > Hi All, > > I've built a measurement PLL along the lines of W. Riley's and Warrens's > designs. It's working, but I have a hole in my understanding of them. > The transfer function of the OCXO (10811-60159 in my case) is decidedly > non-linear, implying that that the voltage output is also not > proportional to frequency. Where does this non-linearity get corrected > before analysis in either Warren's or Bill's systems? > > Also, without access to a 5062C as a noise source as some lucky folk do, > what test modulation patterns could I use to verify and calibrate the > gadget? I have an HP8662A, 3325A, 33120A and 8648C which I can rig > together to generate various phase or frequency modulations. Simple FSK > gives the expected square wave output (which is where I noticed the OCXO > non-linearity). What other tests would you recommend? > > Also, I have 24bit, 192k sound cards which work down to around 1Hz. Are > there any analysis packages I should look at to explore PN output, or is > spectrum lab the best best? > > Thanks from a beginner. > > david _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
