[time-nuts] MTI 260-0624-D OCXO
timenut at metachaos.net
timenut at metachaos.net
Wed Feb 17 15:59:23 UTC 2016
The vendor is resending it. He has not said what he wants done with the dead
one. Probably nothing, in which case I will tear it apart. Probably won't fix
anything, but at least I'll get a good look inside. And the SC crystal could
always be used in a custom DOCXO.
Mike
> I've had essentially the same experience with a batch of 34310-Ts that I
> got from China. Some are very good, most are good enough, some work but are
> useless for anything serious. I haven't gone through enough of them to get
> any feel for the waste rate. Hopefully it won't be more than 2 out of 10.
> Bob
> --------------------------------------------
> On Tue, 2/16/16, Bob Camp <kb8tq at n1k.org> wrote:
> Subject: Re: [time-nuts] MTI 260-0624-D OCXO
> To: timenut at metachaos.net, "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Date: Tuesday, February 16, 2016, 8:27 PM
>
> Hi
>
> The 260’s that I have seen from inside the
> USA have been pretty good (not perfect, but
> certainly not dead). Most of the issues have
> been quibbles. Phase noise not quite in spec.
> ADEV not quite as good as it might have been.
>
>
> Everything I have seen so
> far from China (260 or not) has been very hit or
> miss. Stuff that is called “scrap for parts
> only” (like a pile of 10 Rb’s I have here) may turn
> up more working parts than something labeled
> “great / tested / buy now / first best great
> product (a direct quote)“. I have tried the
> “buy a few and then go back” approach. There
> has been little correlation between what I got
> the second time and what came in first. My
> conclusion (often stated) is that the salvage
> process over there is pretty brutal.
>
> Bob
>
>> On
> Feb 16, 2016, at 7:58 PM, timenut at metachaos.net
> wrote:
>>
>> 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
>>
>>
> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
--
Best regards,
Timenut mailto:timenut at metachaos.net
More information about the Time-nuts_lists.febo.com
mailing list