Hi Well what I’ve been going from is the information I was taught by the people who actually designed all those crystals back in the 40’s 50’s and 60’s.
Bob On Nov 2, 2013, at 9:50 AM, Mike Feher <mfe...@eozinc.com> wrote: > Exactly - I mentioned this on here about 3 years ago and all of the > self-proclaimed geniuses poo-pooded it. I was told early in my engineering > career in the early 70's, by a very smart man, when I thought I had all of > the answers, that considering all of the trade-offs regarding performance, > around 3 MHz for a crystal is best, operating in the 3rd overtone mode, > hence the slow progression from the 1 and 5 MHz standards to 10 MHz. Now, > getting close to 70, I just see what I can learn from all the "smart" people > on here, and keep quiet most of the time. Regards - Mike > > Mike B. Feher, EOZ Inc. > 89 Arnold Blvd. > Howell, NJ, 07731 > 732-886-5960 office > 908-902-3831 cell > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of David McGaw > Sent: Saturday, November 02, 2013 1:30 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] The 5MHz Sweet Spot > > This all seems to be forgetting that the crystals are usually operated at > 3rd or 5th harmonic. The crystal in a 10811A is 10 MHz/3rd overtone. A > high quality 5 MHz/5th overtone crystal is really a 1 MHz fundamental, a > large piece of quartz. Running at a harmonic greatly reduces the influence > of the package. > > David > > > _______________________________________________ > 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.