[time-nuts] 10811A versus 10811-60111

[Angus]

Old oscillators can be a bit of a pain - as the years (or decades)
pass, aging and deterioration in various parts can have rather
undesirable effects on the performance. Even if it does not cause
actual failure, it can make them much less useful for precision
applications.


On Wed, 27 Aug 2008 14:43:00 +0200, you wrote:

>Corby,
>
>the FTS specs for their FTS1000A, FTS1200, FTS1002A and FTS1003A name
>short term stabilities for all four oscillators to be 1E-12 @ 1,10,100
>s. I have always believed that these specs are kind of "conservative"
>ones so that your FTS1200 #2 fits them VERY well while FTS1200 #1 barely
>meets the specs.
>
>Is there any idea on why these two oscillators behave that different?
>
>Best regards
>Ulrich Bangert 
>
>> -----Ursprungliche Nachricht-----
>> Von: time-nuts-bounces at febo.com 
>> [mailto:time-nuts-bounces at febo.com] Im Auftrag von corby d dawson
>> Gesendet: Dienstag, 26. August 2008 19:23
>> An: time-nuts at febo.com
>> Betreff: Re: [time-nuts] 10811A versus 10811-60111
>> 
>> 
>> Hi,
>> 
>> I have had the occasion recently to measure the aging and 
>> short term stability of a bunch of oscillators.
>> 
>> Measurements were against an EFOS-2 Hydrogen Maser.
>> 
>> I thought that the results between 10811A (-60109 variant) 
>> and the 10811-60111 might be of interest to some.
>> 
>> All oscillators had aging below 5X10-10/day.
>> 
>> As you can see the short term stability of the -60111 
>> compares favorably with the 10811A.
>> 
>> I'll be making some measurements on the -60158 variants and 
>> some motorola units soon.
>> 
>> Cheers!
>> Corby Dawson
>> 
>> 
>> QUARTZ         1 SEC. 10 SEC. 100 SEC. 1K SEC. (ALL HAD AGING BELOW
>> 5X10-5/DAY)
>> ------------------------------------------------
>> 10811-60109    6.11-12 2.52-12 8.78-12
>> 10811-60109    1.65-12 1.91-12 9.79-12
>> 10811-60109    1.65-12 1.99-12 1.11-12
>> 10811-60109    5.47-12 1.16-12 2.38-12
>> 105 STYLE #T 7.60-13 2.01-12 3.94-12
>> 10811-60111    1.27-12 2.65-12 1.93-12
>> 105 STYLE #2  1.14-12 1.57-12 2.26-12 
>> 105 STYLE #3  1.31-12 1.58-12 2.68-12
>> 10811-60111    3.04-12 5.54-12 1.47-12
>> 105 STYLE #4  1.38-12 3.49-12 4.84-12
>> 10811-60109    2.05-12 2.89-12 3.24-12
>> 10811-60111    1.36-12 1.17-12 1.75-12
>> 105 STYLE #5  1.14-12 2.09-12 2.51-12 
>> FTS 1200 #1     7.14-13 1.48-12 1.92-12
>> 10543A             2.86-11 1.05-11 1.63-11
>> FTS 1200 #2     2.99-13 4.30-13 7.69-13 8.65-13
>> 10544A             4.08-12 2.95-12 7.79-12
>> 10811-60111    1.24-12 2.10-12 2.09-12
>> 10811-60111    1.48-12 1.59-12 1.54-12
>> 10544A             1.89-12 2.99-12 5.01-12
>> 105 style #6       2.88-12 2.88-12 7.37-12
>> 105 style #7       9.69-13 2.30-12 3.49-12
>> 10544-60511    8.20-13 2.11-12 2.51-12
>> Piezo clone        2.57-12 2.23-12 2.17-12
>> 5060A osconly  4.04-12 5.94-12 8.42-12 1.30-11
>> 10811-60111    2.59-12 3.87-12 5.77-12
>> 
>> -60109spec       2.50-12 5.00-12 1.00-11
>> -60111spec     <1.00-12    *       *
>> 10811Aspec     5.00-12 5.00-12 1.00-11 
>> *not specified 
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