[time-nuts] 5MHz x 10MHz

[Bob Camp]

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 <mfeher at eozinc.com> 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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: magnus at rubidium.dyndns.org
>> To: time-nuts at febo.com
>> 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
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