> That's incredible Mike. I've never seen a 10811 or E1938 within a > factor of 10 of the first number you gave, let alone the second. > The second rate would be very respectible for a Rb standard. > I believe those antique oscillators you have are using non-HP > made xtals at 1 MHz (or 5 MHz at the most) in glass packages. > While a steady temperature and solid mounting is great, it takes > more than that to put up these kind of numbers. Congratulations, keep > taking good care of those old war horses. I wish Len Cutler were > still around to tell about it. He proudly keep a 107 prototype > in his office. Len couldn't bring himself to design anything that wasn't > a doomsday machine. > > Rick Karlquist, N6RK
Rick, I have an old HP 106 with similar amazingly low drift performance and was able to talk to Len about it a few years ago. He was very pleased to hear it was still working, and so well. It drifted a just few parts in 10^11th over a 40 day run, which puts the daily drift rate in the mid to low -13's. At this point the system tempco (106 or Rb) is clearly a greater factor than the resonator drift rate (and my lab was in the garage ten years ago). Some old plots are here: http://www.leapsecond.com/museum/hp106b/ The 106 used a monster-sized 2.5 Mc AT-cut xtal, similar to the original Sulzer's of that era. /tvb _______________________________________________ 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.
