The one that is 80 Hz low sounds like it may have a cold oven. The one that is 500 Hz low must be one of the special units made to test short term stability by having a 500 Hz beat note. I don't see any way a bad crystal would ever leave the factory, and I have never heard of a crystal going bad in the field.
Rick Karlquist N6RK Mark Amos wrote: > Time-nuts, > > Seems like a bad batch of HP10811's was dumped on e-bay over the > holidays... Some (at least > 2) won't tune up to 10MHz: one won't adjust above 9,999,530 and the other > peaks around > 9,999,920 after warming up for a day or so. It seems to stay on frequency > (albeit the wrong > one...) > > I did some preliminary checks (internal reference voltages, OK, etc.) I'm > thinking that it > must be a bad crystal to be this far off. > > C'est une cause perdue? (I.e. did I buy a "parts" unit?) > > Mark > > > > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
