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

[Magnus Danielson]

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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