Hi Positive aging on a crystal is not at all unusual. If your device dates to the 1970’s, it’s had a *lot* of time to age. Aging up a couple ppm over 40 years is not at all unusual ….
There are a variety of methods out there to double the frequency. The diode “rectifier” doublers are generally the most stable approach. The thing to avoid is a lot of bandpass filters. They will be temperature sensitive and “modulate” the output as temperature changes. Bob > On Jul 17, 2019, at 6:07 PM, Roy Thistle <roy.this...@mail.utoronto.ca> wrote: > > Hi All: > > I tried to search for this, in the forum, but, I didn't find much. > > I'm interested in getting a AN/URQ-10A... I have the manual. It's an old on > ship, frequency standard. > > Does anyone have recommendations, or issues, concerning these units? > > The one I am thinking of is a little bit high (about +10 Hz, I think) and > can't be "tuned" back to 5 MHz, without... I am guessing calibration. But, I > am wondering if... because of the positive drift, if the crystal is damaged. > > By the way, how and why 5MHz... because its not that useful! … at least today. > > Does a frequency doubler… assuming a lock on the standard... cause errors in > the 10 MHz signal obtained? > > Best regards and wishes > > Roy > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
