Hi The "OCXO" in most Rb's isn't all that great. They are after good ADEV, but tempco and aging aren't terribly important.
Bob On Aug 26, 2013, at 1:34 PM, Nathaniel Bezanson <mys...@telcodata.us> wrote: > At room temperature, mine takes about 3-4 minutes heating until the lamp will > start. You'll see RbMon showing SD2 and AD4 at max values, then they'll > settle back into something sensible once it lights up. After that, you're > watching the DS signal values and hoping the (large, small) turns into > (small, large). > Mine had a blown capacitor in the lamp circuit, thus it wouldn't ignite; SD2 > and AD4 never budged. I opened it up to find a cracked tantalum cap: > http://imgur.com/bASgB After replacing the cap, I now get lamp ignition but > it doesn't achieve lock. (Photocell signal AD9 very low.) Once I swear I saw > RbMon claim it had locked, about 6 minutes after power-up, but a moment later > it was back to unlocked state and it's never repeated that feat. No idea what > happened there. > I'm wondering whether one can simply use it as a nice (albeit power-hungry) > OCXO. If given 1pps from GPS, will the quartz discipline itself even without > the Rb loop running? > -Nate B- > Stephen Tompsett (G8LYB) wrote: >> Use the RbMon utility to monitor the unit's operation as it >> starts up to >> confirm that the lamp is started and the photocell is detecting a signal. >> Not long ago there were a number of units available for sale on Ebay >> that appeared to have a lamp problem. >> >> On 23/08/2013 02:10, Paul wrote: >>> As I patiently wait for my PRS10 to lock I'm curious if there's a >>> limit beyond which I should assume the unit is faulty. >>> >>> It does produce abount 10MHz (+- .2 Hz) and the oven current dropped >>> at what I assume is operating temperature. >>> _______________________________________________ >>> 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. >>> >> -- >> Stephen Tompsett (G8LYB) >> >> _______________________________________________ >> 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.
