[time-nuts] Trimble OCXOs - 6525, ... and ...

Bob Camp kb8tq at n1k.org
Mon Jul 7 06:41:48 EDT 2014


I have not seen a Trimble OCXO with an internal trimmer for frequency set. They probably do exist, but they are not common among the newer (post 2001) parts.


On Jul 6, 2014, at 11:45 PM, Alex Pummer <alex at pcscons.com> wrote:

> some older models have higher phase noise, the very new ones are very good, sometimes they aged out the control voltage range, needing higher control voltage to pull to 10,0000000 MHz, some of them can not be pulled to the correct frequency any more without mechanical readjustment. They have inside a trim cap to set the tuning range, which is not accessible without opening the case.The case is hermetically closed.
> Some companies for very high performance units  filling the hermetically closed case with nitrogen, also reducing the pressure of the filing  gas bellow the atmospheric level.
> 73
> Alex
> On 7/6/2014 7:43 PM, Chuck Forsberg WA7KGX wrote:
>> On 07/06/2014 05:38 PM, Philip Pemberton wrote:
>>> Hi there,
>>> I've noticed a couple of Trimble OCXOs listed on "that auction site". Specifically, model numbers:
>>>  - 65256
>>>  - 49423
>>>  - 34310 C1
>>> They all seem to be 12V, 10MHz, sine-wave units. Does anyone know if there are any other differences between them? Do any specific ones perform better than the others?
>>> There's a bit of a price difference between them, but data on Trimble OCXOs seems to be quite sparse (a bit like data on their GPS modules, really).
>>> Thanks,
>> I bought a replacement OCXO for a Thunderbolt whose OCXO had died.
>> The pinouts are different.
>> The housing is much taller and won't fit in the Thunderbolt enclosure.
>> The polarity of the VCO pin is different.
>> That said, I was able to get the kluge to work by changing the polarity of the loop gain.
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