John, Thank you for the links (I visited few times before) and your recommendations. Really I am looking for a source with a good short range stability performance between 1 and 10 seconds. I will prepare additional description of my task with more details shortly ... Special Thanks for your TimeLab software which I use for ADEV and PN measurements. Karen, ra3apw
> Date: Sun, 26 Oct 2014 14:28:24 -0700 > From: "John Miles" <j...@miles.io> > > > Can I have your recommendation regarding a choice of 10 MHz rubidium > > source (available now on eBay like FE-5680; LPRO-101; LPFRS; FRS etc.) > > as a reference signal for my frequency counter Pendulum CNT-91. > > > > You might take a look at the plots at http://www.ke5fx.com/rb.htm if you > haven't already, and also at http://febo.com/pages/oscillators/rubes/ . > These will give you an idea what to expect from some of the popular Rb > models. The PRS10 mentioned by Said is a great choice for long-term > measurements, but it's also the most expensive of the ones you are likely to > find on the surplus market. > > Interestingly, if you want the best performance between 1 and 10 seconds > the PRS10 is actually the worst of the ones I measured. But the CNT-91 > probably will not be able to see the difference, since its single-shot > resolution is a bit worse than the HP 5370B counter (see attached plot). > > Caveats: 1) No rubidium standard will give its best long-term performance > until it has been allowed to run undisturbed for at least a few days. 2) > These > plots shouldn't be taken too seriously because of the (very) small number of > examples tested under inconsistent environmental conditions. > > -- john, KE5FX > Miles Design LLC _______________________________________________ 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.