> I am not able to measure Phase Noise as per spec, I am looking for > assistance from this group on the best method for measuring phase noise > and stability using what equipment I do have in my Lab. I have a > TDS2022B with FFT, HP 53131 and Tek492BP. My standard's reference is > one of Tom's Thunderbolt with John's mods ( 10811 ) and a good quality > linear power supply.
I think that seller had >1 of those oscillators, didn't he? If you buy one more and phase-lock them together, your 492BP can measure the PN, per the guidelines at the very end of the GPIB Toolkit FAQ. All it will take is a mixer and an opamp. You'll be able to see down to 1 kHz, if the 492BP's minimum RBW is 100 Hz. Without another oscillator to compare it with, I don't see any economical way to measure it. Supply-wise, an ordinary LM317T is quiet enough to avoid degrading a ULN oscillator (much), so it should be OK for a Sprinter-class part like these. A Zener+emitter follower is the next step. Most likely you will not need to go to the trouble of building a noise-cancelling shunt element. Avoid the temptation to use a large choke and electrolytic as a filter -- this will tend to crowd all of the available power-supply noise into a small hump around the LC network's resonant frequency. You can get the original spec sheet by emailing sales (at) wenzel.com with the part #. If the info is proprietary to a customer who's still in business, they may not release it to you, but they're always nice about it. -- john, KE5FX _______________________________________________ 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.
