[time-nuts] CTS oscillator info?

[Rex]

Peter Loron wrote:
>> I just bought an oscillator on ebay. Here's the basic description from
>> the listing,
>> "This is an auction for one CTS Knights 970-2162-0 (WP 93216-L1) 5MHz
>> OCXO oscillator."
>>
>> It is a double oven and actually has a frequency of 5.000055 MHz on  
>> the
>> label, so 55 Hz above
>> 5 MHz. I'm hoping it is a very clean source and will be good for  
>> beating
>> against other 5 MHz
>> sources to measure them, but I haven't found any more info on this one
>> with searches.
>>
>> Does anyone on the list have any guess what it might have been used
>> with? I'm guessing it may be
>> for some piece of measurement test equipment. Or does anyone have a  
>> lead
>> on specs for the
>> quality of its output signal?
>>
>> The auction was 130297655960, if anyone wants to look at the pictures.
>>
>> thanks,
>> Rex
>>     
>
> Hello, group. The item Rex is referring to is one I sold to him. When  
> I acquired the lot of OCXOs, I sent a mail to CTS, asking them for any  
> information on them. They were able to supply me with the mechanical  
> drawings, but the specs are proprietary as they were custom built for  
> Lucent...likely embedded in some sort of comms equipment. I'm guessing  
> that if they went to the expense of buying double-oven oscillators,  
> they chose good specs for them.
>
> I'm thinking of desoldering the adjustment screws on one of them to  
> see if I can tune it to 5.000000 MHz, although that is probably in  
> noise floor of my equipment.
>
> For somebody (like me) who does not have a background in metrology and  
> lacks any serious measuring equipment, is there a way to characterize  
> items like this short of sending them to a lab?
>
> Thanks.
>
> -Pete
>
>
>   

A list member sent me a brief CTS datasheet. Looks like the oscillator 
is probably a version of JKSC-142. The info is brief and does not 
mention noise but the main feature is long term and temperature 
stability. STABILITY: +/-1x10^-7 for 20 yrs without any adjustment.

I can't guess why Lucent would want them 55 Hz above 5 MHz unless it was 
some kind of measurement application, but I don't know much about 
telephone stuff.

-Rex