[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