Tom,
Have you ever tested the HP106B for phase noise? And in particular between the HP106B and the BVA 8600 which is the best from this point of view? Luciano Luciano P. S. Paramithiotti [email protected] www.timeok.it Da "time-nuts" [email protected] A [email protected] Cc Data Sat, 21 Mar 2020 19:06:08 -0700 Oggetto Re: [time-nuts] HP 106B on Ebay I second what Corby says. I have a number of hp 106, starting with one from eBay in 1999. Quite rare. When they work they are somewhere between very good and unbelievable. But most have issues. They are all very old by now and one trouble I've seen is that the double ovens don't work like they used to, which pretty much ruins their performance. So when you power it up it's a good idea to continuously log frequency (10 s gate is ok) for the first day or two and by looking at the wiggles, slopes, and slope changes, you can tell if the inner and outer oven are working right, or if one is dead, or if due to old age they are fighting each other. The daily ageing rate should slow down gradually. At some point (maybe months) environmental effects will exceed the ageing rate. These standards were meant to be powered up forever, in laboratory conditions. I had one that was far better than rubidium or cesium short-term, and almost rivaled rubidium long-term. It died of oven failure. Some photos, warm-up, and long-term plots: http://leapsecond.com/museum/hp106a/ http://leapsecond.com/museum/hp106b/ If you have questions feel free to ask us on- or off-list. And again, if at all possible collect data from the very first power-up. /tvb On 3/21/2020 4:47 PM, [email protected] wrote: > If whoever bought it needs advice I have repaired a couple of them. > > It does not have a dewar. > > Both the units I worked on had low to mid parts in 10 -13th from 1 to 100 > Sec. > > They do take 3 to 4 hours to warm up so don't be impatient. > > Aging wont slow down for several weeks. > > Cheers, > > Corby > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
