[time-nuts] Z3815A

[Bob Camp]

Hi

Your 10811's are likely a result of someone going through a *lot* of 10811's to pick those out. I believe that the 260 part in the Z3815 is specified for a maximum ADEV of 1x10^-12 at one second. They show a part like that on their standard spec sheet. It's certainly quite possible to hit that level of performance with a HC-40 package 5 MHz 3rd SC. The "sort out the best" units should be down below 5x10^-13 over the entire 1 to 100 second range. 

That's based on the assumption that Symmetricom bought the tight spec parts. Without a late night trip to the Symmetricom file vault I doubt we'll ever really know what they specified. 

Bob


On Jun 11, 2010, at 10:20 AM, EWKehren at aol.com wrote:

> I have not seen any plots on the 260 or E1938A on this site, I have only  
> been on for a year, how ever I have a "few" 10811s" that Corby Dawson ran for 
> me  all below 1 E-12 one as low as 4 E -13 in the 1 to 100 sec. range. My 
> problem is  that Corby's file size is 900K and I have not found a way to 
> compress otherwise  I would share some of the results.  
> Bert Kehren Miami
> 
> 
> In a message dated 6/11/2010 9:52:55 A.M. Eastern Daylight Time,  
> sar10538 at gmail.com writes:
> 
> Thanks  Bob.
> 
> On 12 June 2010 01:24, Bob Camp <lists at rtty.us>  wrote:
> 
>> Hi
>> 
>> The 260's are better for  environmental  than a 10811, same / worse than a
>> 1938. The  "typical" 260 beats the "typical" 10811 or 1938 on short term /
>> medium  term stability. There are some 10811's and 1938's that will indeed
>> beat some 260's for short term stability.
>> 
>> Bob
>> 
>> 
>> On Jun 11, 2010, at 9:04 AM, Steve Rooke  wrote:
>> 
>>> On 11 June 2010 07:24, Murray Greenman  <Murray.Greenman at rakon.com>
>> wrote:
>>> 
>>>> 
>>>> If you have one of the earlier Z3815A units, you  will find the superb 
> HP
>>>> E1938A 10MHz reference oscillator  inside. There were manufacturing
>>>> problems with these units, I  understand, and later ones (like mine) 
> have
>>>> a Milliren 260  series 5MHz DOCXO (with excellent specs) on a daughter
>>>> board  made by Symmetricom.
>>>> 
>>>> 
>>> That  Millren 260 series DOCXO is used in the Z3805A units too. Any idea
>> how
>>> they compare to the E1938A or 10811?
>>> 
>>> Thanks,
>>> Steve
>>> --
>>> Steve Rooke -  ZL3TUV & G8KVD
>>> The only reason for time is so that everything  doesn't happen at once. 
> -
>>> Einstein
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>> 
>> 
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> 
> 
> 
> -- 
> Steve Rooke - ZL3TUV &  G8KVD
> The only reason for time is so that everything doesn't happen at  once.  -
> Einstein
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