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

Bob kb8tq kb8tq at n1k.org
Fri Dec 8 14:09:13 EST 2017 

Hi

The big deal with the BVA is that the blank is “isolated” from the mount by a set of slots 
in the blank edge. That lets them achieve single plane stress isolation. The intent is to 
reduce the impact of holder stress as part of aging. Moving the electrodes off of the 
blank is intended to reduce the stress effects of the thermal mismatch between the electrode
and the quartz. 

There are still *plenty* of reasons for the resonator to age, so no, this does not take aging
out of the picture.

Bob

> On Dec 8, 2017, at 2:05 PM, Tom Knox <actast at hotmail.com> wrote:
> 
> Happy Holidays Magnus!  What I was wondering was that the BVA is somewhat unique since other oscillators have metal directly deposited over the quartz resonator, where the BVA is capacitive coupled. I was wondering if that made the quartz age less if at all.
> 
> Cheers;
> 
> Thomas Knox
> 
> 
> 
> ________________________________
> From: time-nuts <time-nuts-bounces at febo.com> on behalf of Magnus Danielson <magnus at rubidium.dyndns.org>
> Sent: Friday, December 8, 2017 11:32 AM
> To: time-nuts at febo.com
> Cc: magnus at rubidium.se
> Subject: Re: [time-nuts] End-of-Range: Oscilloquartz OCXO 8600-3
> 
> Hi,
> 
> There is sources of drift all over the place.
> 
> The crystal has drift in it, the oscillator core has sources of drift.
> 
> Already within a crystal there is a bunch of sources. Some can
> compensate each other.
> 
> Improvements in production have reduced effects, but there is always
> something that drifts, somewhat.
> 
> Cheers,
> Magnus
> 
> On 12/08/2017 06:27 PM, Tom Knox wrote:
>> Hi All;
>> 
>> Is the "Aging" generally related to the quartz, or other components?
>> 
>> Happy-Merry;
>> 
>> Thomas Knox
>> 
>> 
>> 
>> ________________________________
>> From: time-nuts <time-nuts-bounces at febo.com> on behalf of Bob kb8tq <kb8tq at n1k.org>
>> Sent: Friday, December 8, 2017 9:58 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] End-of-Range: Oscilloquartz OCXO 8600-3
>> 
>> Hi
>> 
>> One risk is that the oscillator may have drifted further than one can easily adjust it by
>> just changing a select cap. That seems silly when we are talking about < 1 ppm, but
>> the 8600 is an unusual OCXO. The electrodes BVA is not your run of the mill crystal.
>> The “air gap” (actually a gap in vacuum) puts a pretty small capacitance in series with
>> the normal crystal equivalent circuit. That cuts the practical tuning range down quite
>> a bit….
>> 
>> Bob
>> 
>>> On Dec 8, 2017, at 11:44 AM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
>>> 
>>> Hi,
>>> 
>>> Many include a EFC offset pot, but when you go out of range on that, as I have for one of mine, here is no real option execept pop the lid and potentially find a cap or change a cap. I have not seen any as I recall, but should maybe take a look.
>>> 
>>> However, the value for me is not to have it as sharp 5 MHz source, but very low phase noise and high stability source as reference for measurement. The offset error is less of a concern then, so that is why I have not spent quality time to fix it.
>>> 
>>> Cheers,
>>> Magnus
>>> 
>>> On 12/08/2017 04:52 PM, paul swed wrote:
>>>> I took a quick look at the spec sheet.
>>>> It appears coarse adjustment is an option M and would actually be a pot.
>>>> That speaks to another tuning diode for coarse? Or a pot on pot arrangement.
>>>> That sounds ugly.
>>>> Regards
>>>> Paul
>>>> WB8TSL
>>>> On Fri, Dec 8, 2017 at 10:17 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
>>>>> Hi
>>>>> 
>>>>> It is quite possible that nothing is actually broken and that the crystal
>>>>> has simply drifted
>>>>> outside the tuning range. It should be pretty easy to spot the coarse
>>>>> tuning device once
>>>>> the package is open. I would bet you will find a selected capacitor across
>>>>> the coarse tune or in
>>>>> series with the coarse tune. Changing the value of that cap should bring
>>>>> things back on
>>>>> frequency. I would avoid changing caps across the EFC tuning diode.
>>>>> 
>>>>> Bob
>>>>> 
>>>>>> On Dec 8, 2017, at 8:05 AM, Ulf Kylenfall via time-nuts <
>>>>> time-nuts at febo.com> 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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