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 <[email protected]> wrote: > Subject: Re: [time-nuts] MTI 260-0624-D OCXO > To: [email protected], "Discussion of precise time and frequency > measurement" <[email protected]> > 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, [email protected] > 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 -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Best regards, Timenut mailto:[email protected] _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
