Hi If you have the time to get it going, it’s in deed a good short term stability source. It’s long(er) term stability is not as good as a Cesium. Possibly the most interesting thing might be to rip out the silly old synthesizer and put in something more modern.
If you decide to “throw it away” there are a number of us who probably will line up by your dumpster :) Bob > On Mar 16, 2016, at 4:24 PM, KA2WEU--- via time-nuts <time-nuts@febo.com> > wrote: > > In my closet I found one of these, any merit to play with it ? > > Ulrich > > > In a message dated 3/14/2016 5:00:28 P.M. Eastern Daylight Time, > lars.walen...@hotmail.com writes: > > Hi > > Shouldn´t 5x10^-11 over 50C be 1x10^-12 / C? So with 2-4°C variation it is > 2-4x10^-12. > > What about pressure variations for the HP5065 and other Rb´s? My LPRO have > about 7x10^-14/mBar (hPa) so with 15-20mbar change, that can happen quite > quick, it is also in the ^-12 range. The tempco for my LPRO is 7x10^-13/°C > and drift in the high ^-14 per day so my GPSDO controller mostly fights the > temperature and pressure variations I think. I like having a GPS > disciplined Rb as I haven´t had to adjust it during the last years. Of > course a OCXO > based GPSDO will also stay on frequency. For me the Rb have been good when > I have tested GPS modules and GPSDO´s just out of curiosity. In hold mode > it have been useful to get the ADEV out to say 10000 secs (low ^-13). > > Lars > > Från: Bob Camp<mailto:kb...@n1k.org> > Skickat: den 14 mars 2016 02:01 > Till: Discussion of precise time and frequency > measurement<mailto:time-nuts@febo.com> > Ämne: Re: [time-nuts] HP 5065A repair > > Hi > > Some math: > > 5x10^-11 over 50C > > You have 1x10^-13 / C > > If you have pretty good HVAC you get 2C cycles. On a typical home system, > you get 2X that or more. > > Net is a bump at 2x10^-13 (or more). > > That assumes no hysteresis. (Hint: there always is hysteresis). > > That assumes you have no rate dependent effects. (… they almost always are > present ..). > > If you are at 10X the data sheet level, the bump is more like 2x10^-12 (or > more). Either one will likely show up on a good test plot. > > Can you take care of all this? Of course you can. Does modeling and > correcting all this fall into the “quick and easy fix” category? Nope, not > at > all. The thread is about a request for a simple approach to an Rb setup. > That > sort of thing does not include fancy models and all sorts of corrections. > > Bob > > > >> On Mar 13, 2016, at 5:10 PM, Poul-Henning Kamp <p...@phk.freebsd.dk> > wrote: >> >> -------- >> In message <aabmqmgvvauqc...@smtpout04.dca.untd.com>, cdel...@juno.com > writes: >> >>> As far a tempco goes, unless your lab swings tens of degrees will you >>> really see it? >> >> Well, I do... >> >> My air-con is far from optimal, but it clearly makes a very obvious >> bump in my AVAR plots. >> >> >> -- >> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 >> p...@freebsd.org | TCP/IP since RFC 956 >> FreeBSD committer | BSD since 4.3-tahoe >> Never attribute to malice what can adequately be explained by > incompetence. >> _______________________________________________ >> 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. > > _______________________________________________ > 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. > _______________________________________________ > 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. > > _______________________________________________ > 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. _______________________________________________ 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.