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

[timenut at metachaos.net]

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
 >> 
 >>
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-- 
Best regards,
 Timenut                            mailto:timenut at metachaos.net