[time-nuts] Surplus OCXO’s

[Bob Camp]

> Ok, this got a bit tangled with various email addresses linked to here and there. Let’s see if it works better this way. 
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> 
> Hi
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> 
>> On Nov 23, 2014, at 1:04 AM, Perry Sandeen <sandeenpa at yahoo.com> wrote:
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>> List,
>> 
>> Wrote: Surplus OCXO’s are well … surplus. A significant percentage of the OCXO’s I’ve seen on the surplus marked are pulls off boards and are busted. I’ve bought quite a few from “tested / guaranteed / 100% good / perfect buy” sellers and found issues with then when you carefully test them.
>> 
>> Well that is depressing as all get out.  So some questions.
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>> What were the issues you found when carefully tested?
> 
> There were a range of issues from “no output / runaway heater” to “output goes away after a week” to “ADEV well out of spec”. 
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>> 
>> Were those issues reasonably repairable?
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> Some of the first order stuff was. None of them really came up to full performance. 
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>> 
>> If an overseas vender has an OCXO that’s still attached to a board, is it likely to be OK?
> 
> That depends a lot on things you can’t possibly know. Was that batch of OCXO’s damaged when they were installed, did the board blow up , ….
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>> 
>> Was your *good yield* worth the low price and sorting? (Ignoring your time spent issue.)
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> At < 20% after repair, not to me. Others have had much better luck.  
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>> 
>> The vender Fluke1 appears to do some extensive testing of his OCXO’s.  Would he be a better source than others?
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> I’ve had better luck with him than with others. I have (rarely) received various things from him over the years that did not work 100%. He has *always* been helpful in those cases. His prices are higher than some others, that may reflect the true cost of good parts compared to un-sorted parts. 
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>> 
>> My questions are based that one can get 10811’s on a board here in the USA for $125 or the later model new for $100 from china.
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> Specifically on a 10811, you want to be sure it didn’t go under water. It’s an un-sealed unit. 
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> Bob
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>> 
>> TIA.
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>> Regards,
>> 
>> Perrier
>> 
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