Hi Your 10811's are likely a result of someone going through a *lot* of 10811's to pick those out. I believe that the 260 part in the Z3815 is specified for a maximum ADEV of 1x10^-12 at one second. They show a part like that on their standard spec sheet. It's certainly quite possible to hit that level of performance with a HC-40 package 5 MHz 3rd SC. The "sort out the best" units should be down below 5x10^-13 over the entire 1 to 100 second range.
That's based on the assumption that Symmetricom bought the tight spec parts. Without a late night trip to the Symmetricom file vault I doubt we'll ever really know what they specified. Bob On Jun 11, 2010, at 10:20 AM, [email protected] wrote: > I have not seen any plots on the 260 or E1938A on this site, I have only > been on for a year, how ever I have a "few" 10811s" that Corby Dawson ran for > me all below 1 E-12 one as low as 4 E -13 in the 1 to 100 sec. range. My > problem is that Corby's file size is 900K and I have not found a way to > compress otherwise I would share some of the results. > Bert Kehren Miami > > > In a message dated 6/11/2010 9:52:55 A.M. Eastern Daylight Time, > [email protected] writes: > > Thanks Bob. > > On 12 June 2010 01:24, Bob Camp <[email protected]> wrote: > >> Hi >> >> The 260's are better for environmental than a 10811, same / worse than a >> 1938. The "typical" 260 beats the "typical" 10811 or 1938 on short term / >> medium term stability. There are some 10811's and 1938's that will indeed >> beat some 260's for short term stability. >> >> Bob >> >> >> On Jun 11, 2010, at 9:04 AM, Steve Rooke wrote: >> >>> On 11 June 2010 07:24, Murray Greenman <[email protected]> >> wrote: >>> >>>> >>>> If you have one of the earlier Z3815A units, you will find the superb > HP >>>> E1938A 10MHz reference oscillator inside. There were manufacturing >>>> problems with these units, I understand, and later ones (like mine) > have >>>> a Milliren 260 series 5MHz DOCXO (with excellent specs) on a daughter >>>> board made by Symmetricom. >>>> >>>> >>> That Millren 260 series DOCXO is used in the Z3805A units too. Any idea >> how >>> they compare to the E1938A or 10811? >>> >>> Thanks, >>> Steve >>> -- >>> Steve Rooke - ZL3TUV & G8KVD >>> The only reason for time is so that everything doesn't happen at once. > - >>> Einstein >>> _______________________________________________ >>> 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. >> > > > > -- > Steve Rooke - ZL3TUV & G8KVD > The only reason for time is so that everything doesn't happen at once. - > Einstein > _______________________________________________ > 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. > _______________________________________________ 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.
