[time-nuts] End-of-Range: Oscilloquartz OCXO 8600-3

Bob kb8tq kb8tq at n1k.org
Fri Dec 8 16:26:29 EST 2017


Hi

It might be, if it is then an upper turn in the 80C range is not all that crazy.

Bob

> On Dec 8, 2017, at 4:24 PM, Angus <not.again at btinternet.com> wrote:
> 
> 
> That near the end of the temperature range the direction could also
> give a good indication - assuming that there is only one problem...
> 
> I think the 8600-3 is still an AT - the 8607 is SC.
> 
> Angus.
> 
> 
> On Fri, 8 Dec 2017 15:40:08 -0500, you wrote:
> 
>> Hi
>> 
>> One basic question - Is the frequency high or low? 
>> 
>> Assuming it’s an SC and on the lower turn, frequency low is possible 
>> with an off temperature oven. Frequency high is unlikely unless it’s *way*
>> off temperature. How far off turn gives you how much delta F depends on
>> the inflection temperature of the crystal. It matters if it’s a “true SC”or a 
>> “modified SC”
> .. If it is a true SC and running at 80C, that’s about 10 degrees
>> below inflection. There will not be a lot of frequency change in that case.
>> 
>> Many (but not all) modern crystal processes tend to age positive. If that is the
>> case on these parts, a frequency high is the likely outcome of “age out of range”. 
>> Even with a process that has a known tendency, only about 70% of them go 
>> that direction over long periods of time. It’s not a perfect thing 
> .
>> 
>> Bob
>> 
>>> On Dec 8, 2017, at 2:34 PM, Angus <not.again at btinternet.com> wrote:
>>> 
>>> 
>>> The 8601 that I have was about 2 deg C off turnover when I got it, but
>>> I can't remember what sort or frequency error that caused. The
>>> temperature coefficient was terrible with that error.
>>> 
>>> Angus.
>>> 
>>> 
>>> On Fri, 8 Dec 2017 13:05:14 +0000 (UTC), you wrote:
>>> 
>>>> 
>>>> Gentlemen,
>>>> We have an Oscilloquartz OCXO 8600-3that cannot any longer be adjusted into 5,000,000 Hz.It is about 1 Hz out of 5 MHz and turning coarse/fineadjustment potentiometers cannot bring the frequencyinto its specification.
>>>> Oven temperature is about + 80C accordingto the thermistor and the operating voltageis at 24 VDC.
>>>> Have Googled but the only thing that turns upis datasheets w/o any details.
>>>> Before I take it apart and start lookingfor obviously broken components, isthere anyone that has a CLIP on this unit?
>>>> 73
>>>> 
>>>> Ulf Kylenfall - SM6GXV
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