I've had my eye on the Stanford Research SG 380 for some time - they boast -116dBc/Hz phase noise
http://thinksrs.com/products/SG380.htm They use a pretty interesting "rational approximation frequency synthesis" which they discuss in detail in their operating manual. This allows them to drive down the phase noise. Too bad it's nearly $4000... Andy Bardagjy bardagjy.com On Mon, Jul 8, 2013 at 10:55 AM, Ed Palmer <ed_pal...@sasktel.net> wrote: > In 2002, this document: > > THE CRYSTAL OSCILLATOR CHARACTERIZATION FACILITY AT THE AEROSPACE > CORPORATION > http://www.pttimeeting.org/**archivemeetings/2002papers/**paper32.pdf<http://www.pttimeeting.org/archivemeetings/2002papers/paper32.pdf> > > stated: > > "The Programmed Test Sources, Inc. PTS model #250M6NIGSX-51 low-noise > frequency synthesizer is > used to offset the frequency reference to obtain the desired beat > frequency. In our previous system, we > used a Fluke 6160B frequency synthesizer, since the Fluke 6160B frequency > synthesizer had the lowest > noise contribution of all the frequency synthesizers on the market at that > time. The reason for having the > low-noise frequency synthesizer is the synthesizer noise contributions to > the system noise-floor. > Unfortunately, Fluke has discontinued manufacturing and maintaining this > synthesizer. Therefore, we > looked at the new synthesizers on the market and found that the PTS > synthesizer was the closest to the > Fluke 6160B frequency synthesizer in terms of noise floor. " > > Sounds like a working 6160B would be a nice thing to have. Unfortunately, > it's too large for my already overcrowded lab. :-( > > Ed > > > > On 7/8/2013 3:44 AM, Anders Time wrote: > >> I have been looking around for a very stable synthesizer(<E-12 at 1s >> adev). >> The only really good information that I have found is febo.comĀ“s >> measurements on the PTS synthesizers(http://www.febo.** >> com/pages/pts_synth/ <http://www.febo.com/pages/pts_synth/>). >> Is there any other really good alternatives to the PTS synthesizers? DDS? >> HP? >> Best Regards >> Anders >> > ______________________________**_________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ 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.