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

Bob kb8tq kb8tq at n1k.org
Fri Dec 8 15:40:08 EST 2017


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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