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 > > > In a message dated 8/13/2008 16:03:00 Pacific Daylight Time, > [EMAIL PROTECTED] writes: > > [EMAIL PROTECTED] wrote: > > Thanks Bruce, > > > > > > > > it would be interesting to see how the different topologies affect > > phase noise and stability etc, and what kind of performance can be > > achieved. > > > > > > > > bye, > > > > Said > > > > > > > Said > > One way to evaluate the merits of various oscillator circuits would be > to build an example of each and then measure their phase noise and ADEV. > > To keep the number of variables and costs down all oscillators should > use the same 10MHz fundamental crystal. > The oscillators should not be enclosed in their own oven, however an > enclosure with a long thermal time constant can be used. > The oscillator output should be +7dBm into 50 ohms. > No EFC and probably no trimmer cap (however this requires that a > TSC5120A or similar be used to measure the ADEVand phase noise). > Power supply should be standardised at +12V. > > > Bruce > > _______________________________________________ > 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. **************Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos. (http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut00050000000 017 ) _______________________________________________ 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. _______________________________________________ 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.
