Adrian Godwin said: > If you use the ovened oscillator for temporary use away from the home GPSDO, > how good will the oscillator be with those interruptions to power / > temperature, and will it stabilise during the period you're using it there ? You can solve that with a UPS and/or a gizmo that plugs into a car accessory socket. How much does the mechanical jostling as gear gets moved from bench to car to table effect the frequency? -- These are my opinions. I hate spam.

Hi > On Jun 28, 2022, at 12:15 PM, Hal Murray via time-nuts <time-nuts@lists.febo.com> wrote: > > > Adrian Godwin said: >> If you use the ovened oscillator for temporary use away from the home GPSDO, >> how good will the oscillator be with those interruptions to power / >> temperature, and will it stabilise during the period you're using it there ? > > You can solve that with a UPS and/or a gizmo that plugs into a car accessory > socket. You still power it down doing that. Power cycle generally isn’t a good idea if you are after good stability. > > How much does the mechanical jostling as gear gets moved from bench to car to > table effect the frequency? If you flip it end for end you might be measuring the “2g tip” acceleration sensitivity :). That could be up in the 1 to 2 ppb range. Shock and vibe is very much a “that depends” sort of thing. You could (but probably won’t) see a couple of ppb. The biggest issue is going to be the changing temperature environment. Thermal shock is going to create a bigger change than simple temperature change. Going from inside to outside to car to outside to inside …. each one is a relatively fast change. You might have a device that held a ppb in a normal temp test and it changes 10X that (or more) when hit with a relatively modest “fast change”. Just what’s fast and how much of a change you get is very much a “that depends” sort of thing. Leave the cover off your OCXO mechanical trimmer and you could find that it is very sensitive to a gentle gust of wind from the wrong direction …. Bob > > > -- > These are my opinions. I hate spam. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

OCXOs generally don’t require a lot of power. A small (portable size) UPS can keep the OCXO powered up while on the move. With an appropriate inverter, the UPS can be powered by a vehicle. Think “flying clock” of years ago. On Tue, Jun 28, 2022 at 3:59 PM Bob kb8tq via time-nuts < time-nuts@lists.febo.com> wrote: > Hi > > > > On Jun 28, 2022, at 12:15 PM, Hal Murray via time-nuts < > time-nuts@lists.febo.com> wrote: > > > > > > Adrian Godwin said: > >> If you use the ovened oscillator for temporary use away from the home > GPSDO, > >> how good will the oscillator be with those interruptions to power / > >> temperature, and will it stabilise during the period you're using it > there ? > > > > You can solve that with a UPS and/or a gizmo that plugs into a car > accessory > > socket. > > You still power it down doing that. Power cycle generally isn’t a good > idea if you > are after good stability. > > > > > How much does the mechanical jostling as gear gets moved from bench to > car to > > table effect the frequency? > > If you flip it end for end you might be measuring the “2g tip” > acceleration sensitivity :). > That could be up in the 1 to 2 ppb range. Shock and vibe is very much a > “that depends” > sort of thing. You could (but probably won’t) see a couple of ppb. > > The biggest issue is going to be the changing temperature environment. > Thermal shock > is going to create a bigger change than simple temperature change. Going > from inside > to outside to car to outside to inside …. each one is a relatively fast > change. You might > have a device that held a ppb in a normal temp test and it changes 10X > that (or more) > when hit with a relatively modest “fast change”. > > Just what’s fast and how much of a change you get is very much a “that > depends” sort > of thing. Leave the cover off your OCXO mechanical trimmer and you could > find that it > is very sensitive to a gentle gust of wind from the wrong direction …. > > Bob > > > > > > > -- > > These are my opinions. I hate spam. > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe send an email to time-nuts-leave@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com -- Jeremy Nichols Sent from my iPad 6.