[time-nuts] 5MHz x 10MHz

[Mike Feher]

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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