Hi > On Mar 13, 2016, at 4:37 AM, Iain Young <[email protected]> wrote: > > Hi, > > OK, so I'm about to show the limitations of my knowledge :) > > Bob Wrote: > > On 11/03/16 22:51, Bob Camp wrote: > >> If your target is something like a microwave radio, many Rb’s are > > “challenged” in terms of phase noise and/or spurs. Some sort of > > cleanup will be needed for almost all of them. > > Are some models particularly better than others at either phase noise > or spurs ? If so, do we know which ones ? Or is it more a case by case > basis (damage/maltreatment not with standing...) ?
Hi None of them are what I would call “good” for phase noise or spurs. Even a cheap OCXO will beat them all. The “least awful” that is commonly available on surplus is the PRS-10. > > Also, are we "simply" talking LPF/HPF/BPF precautions here ? No, not at all, the phase noise and spurs are all over the place. > Or would > folks advise doing other things as well ? You need a good clean OCXO and a very narrowband clean up loop. How narrow depends on how good your radio needs to be. > The microwave radio isn't > going to care about delay through any filter [assuming that delay stays > constant of course] (Different on the timing side of course) You would need a filter with a 30 db bandwidth of < 1 Hz to even begin to clean up some of these. > > (I looked at the 10MHz output from the KS24361 boxes that Bob posted > on here, with all the multiples, and brain simply screamed LPF. That’s a *much* cleaner output than most of these Rb’s. > Saw > the sub harmonic, and it shouted HPF at me!) Most microwave radio setups are going to ignore stuff like sub-harmonics. Their multiplier chains are plenty narrow enough to take them out. Bob > > > Iain > _______________________________________________ > 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.
