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

Magnus Danielson magnus at rubidium.dyndns.org
Sun Mar 6 05:56:52 EST 2016


Mike,

Ouch!

Not opening before they say OK seems like a good strategy.

I just wanted to share that little story even if it doesn't help you.
It was worse when I got a BVA with *crushed* thermo-flask. I was 
actually given a replacement thermo-flask within a few days from OSA.

Cheers,
Magnus

On 03/06/2016 02:15 AM, timenut at metachaos.net wrote:
> 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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>
>


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