Hi Well backing up a bit, why does a 5065 have a second harmonic?
Very quickly: The stuff in the physics package creates an absorption notch. You interrogate this notch with a phase modulated locally generated microwave signal. When the signal is at the right frequency it dumps photons and you get a signal in the photo diode. That signal has the (audio) second harmonic in it when you are doing everything just right. Yes, there’s a lot of hand waving in there, but that’s the really fast version. Since a lot of “stuff” is involved, there are a number of ways to loose the second harmonic. Bob > On Nov 18, 2021, at 7:48 PM, Jared Cabot via time-nuts > <[email protected]> wrote: > > Hi, > Your help is appreciated. We can keep this on-list for now I guess, on the > chance it helps someone in the future. > > Jared. > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > On Friday, November 19th, 2021 at 08:25, paul swed <[email protected]> > wrote: > >> Jared I would be happy to see if I can help remotely. We may want to take >> this offline or not. Others may find it interesting. >> Regards >> Paul >> WB8TSL >> > >> On Thu, Nov 18, 2021 at 12:56 PM Jared Cabot via time-nuts >> <[email protected]> wrote: >> > >>> Hi all, >>> > >>> I have a 5065A Rubidium Standard that was working ok, but has lost the 2nd >>> harmonic. >>> My voltages are all ok, the physics package hasn't overheated and I have >>> replaced the usual resistors on the lamp assembly (and it was running fine >>> afterward for a while), the lamp illuminates, and I've done the procedure >>> to remove cell flooding. >>> All readings on the 'circuit check' switch are nominal, apart from the 2nd >>> harmonic position. No matter what I do, I can no longer get it to raise >>> above 0. >>> However, when I first turn the unit on, the needle drops to 0 and flicks a >>> little before settling on 0 and staying there. >>> > >>> Can someone help me get this unit up and running again? >>> > >>> Thanks! >>> Jared_______________________________________________ >>> time-nuts mailing list -- [email protected] -- To unsubscribe send >>> an email to [email protected] >>> To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send an > email to [email protected] > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
