Hi Quartz it's self has no "sweet spot". The only issue is how low you can go in a specific sized crystal holder before you start to run into trouble. A TO-5 crystal will have a different minimum frequency than an HC-40.
Bob On Aug 2, 2013, at 2:30 PM, Mike Feher <[email protected]> wrote: > It was my understanding that this "sweet spot" was optimum a little above 3 > MHz, so, 3rd overtone crystals are used to generate a stable, low phase > noise 10 MHz. Prior to that, 5 MHz was used and before that 1 MHz Regards > - Mike > > Mike B. Feher, EOZ Inc. > 89 Arnold Blvd. > Howell, NJ, 07731 > 732-886-5960 office > 908-902-3831 cell > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Tom Knox > Sent: Friday, August 02, 2013 2:02 PM > To: Time-Nuts > Subject: Re: [time-nuts] 5MHz x 10MHz > > It is my understanding that Quartz has a sweet spot at 5MHz that makes it > ideal if the lowest possible phase noise and highest stability are needed. > > Thomas Knox > > >> Date: Fri, 2 Aug 2013 19:57:16 +0200 >> From: [email protected] >> To: [email protected] >> Subject: Re: [time-nuts] 5MHz x 10MHz >> >> Hi Euclides, >> >> On 02/08/13 18:31, Euclides Chuma wrote: >>> Hi, >>> >>> Why any equipments use 5 MHz and others use 10 MHz reference standard? >> >> There are some benefits (traditionally) in using 5 MHz over 10 MHz, >> but >> 10 MHz have become a common standard. The actual frequency isn't >> really magic, but 5 MHz and multiples became somewhat standard in the >> old MIL STD 188 for time-keeping, and it fit fairly well with what was >> already in use. There are folks here that can correct me on massive > details. >> >> Today 10 MHz is more common because, well, engineers then to be >> following habits, and 10 MHz "sounds nice". I use 10 MHz mainly >> because the application requires it, otherwise I use whatever >> frequency fits my other needs, or what becomes easy to source. >> >> PS. Have not seen you post before, so welcome to time-nuts! >> >> Cheers, >> Magnus >> _______________________________________________ >> time-nuts mailing list -- [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
