Related to this, I have a question in my mind for sometime. How close to a decent phase-noise setup are we if we down convert and use a low frequency spectrum analyzer ? (downconverting with the best XTAL LO we can imagine).
My target is microwaves and millimeter waves so I have to down convert anyway, Or then I have to live with what my spectrum analyzer show me (a tek 492, in my case). --- Rephrasing the question, how much better are the low frequency spectrum analyzers comparing to the microwave spectrum analysers (in phase noise I mean)? Any comments ? Luis Cupido. ct1dmk. P.S.(I know that I'm limites to 100Hz RBW with my 492... and I would like also to measure closer than that ) John Miles wrote: > If you don't want pushbutton convenience, you can measure the close-in phase > noise with not much more than a $5 mixer and $2 opamp. It will take a lot > of "sweat equity," and you will need to build two of whatever you're > measuring, or buy/borrow a known-cleaner source at the same frequency. > > TSC analyzers are great but they are not the only way to go. Actually their > biggest advantages lie in their size/weight and the fact that the reference > doesn't have to be at the same frequency as the DUT. Other than that, their > performance is not necessarily better than a homebrew single-mixer > quadrature PLL or an 11848A. > > -- john, KE5FX > > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> Behalf Of [EMAIL PROTECTED] >> Sent: Wednesday, August 13, 2008 4:40 PM >> To: [email protected] >> Subject: Re: [time-nuts] Designing and building an OCXO and GPSDO >> >> >> Yup, I agree. >> >> I wish I did have one of those TSC5120A's! >> >> Or "at least" an E5052A/B. >> >> bye, >> Said >> _______________________________________________ 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.
