[time-nuts] 10811 Alternatives

[Peter Bell]

I would personally consider those MV89s from Chinese sources as being extra
suspect - a few years back, one of the Chinese surplus vendors had a big
box of them (some removed from PCBs, and others apparently new) that were
identified to me as containing bad ceramic caps and suffering from various
problems ranging from poor phase noise performance to being completely
inoperative.

The guy who had them (who I know quite well) volunteered this information
and said that as far as he was concerned they could only be sold as scrap -
but it's possible they have ended up in the hands of dealers that are not
so scrupulous.


On Mon, Apr 13, 2015 at 8:46 AM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> I don’t think there’s anything at all wrong with the MV-89A as an OCXO. In
> fact, I believe that properly
> handled they are a good part. The gotcha is the abuse they get in the
> “recycling” process. I’m
> willing to bet that any OCXO that sees the same sort of process will come
> out with issues.
>
> Bottom line - Don’t attack an OCXO with a torch, drop it down a flight of
> stairs, leave it out in the rain
> for a few years, and then really abuse it after that. They need to be
> treated with some care ….
>
> For what ever reason, parts like IC’s seem to be more tolerant of the
> scrap out process than OCXO’s.
> Rb’s seen to show up *with* PCB’s still attached, so they didn’t get the
> torch process.
>
> Because of all that, there’s not much way to pick a “good” OCXO model. The
> thing you need to find
> are parts that you are sure did not take a beating while being pulled off
> of boards. With zero view into
> that end of the sourcing process …. not much way to pick and choose.
>
> About the only thing to do is to buy parts that never went on to pc
> boards. That’s no guarantee, but
> it ups the odds a bit. You may be buying test rejects. They could still
> have been dropped down a
> flight of stairs. They might be counterfeit parts.
>
> Considering that you are buying a $250 to $400 OCXO for <$20, there *will*
> always be some risk ….
>
> Bob
>
> > On Apr 12, 2015, at 6:02 PM, Perry Sandeen via time-nuts <
> time-nuts at febo.com> wrote:
> >
> > List,
> >
> >
> >
> > It appears from Bob Camp’sexperience (and others) that the Chicoms
> Morion oscillators are to be avoided.
> >
> >
> >
> > My question is: Could Bob Camp,Rick K. and other gurus with experience
> come up with a list of the Ebay 10 MHzsurplus oscillators that would be
> worth buying as well as what would be a fairprice? Also some good vendor
> names would be nice as well.
> >
> >
> >
> > I realize that surplus listvaries quite a bit and it still a bit of a
> crap shoot, but perhaps the odds arebetter from certain venders, makes, and
> models.
> >
> >
> >
> > Regards,
> >
> >
> >
> > Perrier
> >
> >
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