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

Bob Stewart bob at evoria.net
Tue Feb 16 22:49:45 EST 2016


Hi Bob,

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.


More information about the time-nuts mailing list