[time-nuts] The 5MHz Sweet Spot

Mike Feher mfeher at eozinc.com
Sat Nov 2 10:18:59 EDT 2013


Yes - me too - several even published books and papers on the subject.
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 Bob Camp
Sent: Saturday, November 02, 2013 10:01 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] The 5MHz Sweet Spot

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 <mfeher at 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-bounces at febo.com [mailto:time-nuts-bounces at 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
> 
> 
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