[time-nuts] MTI 260-0624-D OCXO

timenut at metachaos.net timenut at metachaos.net
Sat Mar 5 20:15:59 EST 2016


Magnus,

In this case, the rattle is not of light weight pieces, but of a heavy object.
So, I am guessing that the outer oven broke off somehow. Won't really know
until and unless I open it up. The vendor probably won't want it back, but
they might, so I won't touch it until I hear from them.


Mike

> Hi,

> On 03/05/2016 10:45 PM, timenut at metachaos.net wrote:
>> I got the replacement MTI 260-0624-D OCXO today.
>>
>> It rattles!

> I've seen that on one oscillator. I did a RMA and complained about the 
> maracas mode, which I had demonstrated to the rep. When it arrived they 
> wondered what that mean and the rep just smiled and ask them to pick it 
> up... and it rattle. Turns out that the way they soldered their ovens, 
> drops of solder could form and get loose, so they changed the process.

> Unfortunatly, it is also the failure mode of rough shipping/handling for 
> some oscillators.

> Cheers,
> Magnus

>> I didn't even bother trying to power it up. Not much point. I have not taken
>> it apart, but have notified the seller. I may disassemble this one as well,
>> depending on what the seller says.
>>
>> Mike
>>
>>
>>> I just received a 5Mhz OCXO from eBay (MTI 260-0624-D OCXO). After testing it,
>>> it is clear that it is defective.
>>
>>>     1. It never heats up.
>>
>>>     2. The reference voltage is zero.
>>
>>>     3. Only noise is seen on the output pin.
>>
>>> I tested with a 12.54V, 2A supply voltage with around 30mV noise. That should
>>> be sufficient to test.
>>
>>> All I was looking for was a 5Mhz signal whose frequency changed when the
>>> adjustment pin was either tied to ground or the reference voltage. Never got
>>> that far because I never go a signal at all.
>>
>>> The seller packed it well and shipped it promptly. I will see how he handles
>>> it.
>>
>>
>>> Mike
>>
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>>
>>
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-- 
Best regards,
 Timenut                            mailto:timenut at metachaos.net



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