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.
