[time-nuts] Looking for data on a couple of XO's

[Dave Miller]

Thank you Bob,
That gives me enough confirmation and direction to do some testing.
BTW it was not a Fleabay purchase but a gift from a good friend. Here I
thought you might like this. :-)
I shall report back my findings.
Thanks
Dave


On Mon, May 25, 2020 at 7:48 AM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> It’s a good bet that the power is as indicated. Is there a second supply?
> …. who knows .. in some cases there is. Is it an XO, a VCXO, a TCXO,
> or an OCXO? The base part number should give you some indication
> of that.
>
> If it’s a voltage controlled device one of the “not ground, not power , not
> output” pins should tune the beast. Try feeding a 2 to 3 V signal through
> a
> 10K ohm resistor to the suspect pins and see what happens.  They also
> might be enable / disable or factory adjust pins, thus the isolation and
> low
> voltage.
>
> A pin that comes up with a voltage on it when the unit is powered is likely
> a Vref pin. It might be a combined Vref / tune pin …. again who knows. If
> a 10K to ground on the pin tunes the part, it’s a combined pin.
>
> Output wise, if it’s logic output, your scope should tell you all you need
> to
> know. If it’s sine wave, load is *probably* 50 ohms. It could be just about
> anything ….
>
> Stability wise you are flying blind. Is it more stable than a 30 cent TCXO
> from China? Does it have better phase noise? Are it’s harmonics better?
> No way to know without measuring each parameter.
>
> Indeed, even if you *had* the spec sheet, there is no guarantee that the
> eBay part you have still meet it’s original specs.
>
> If supply is not marked, then a careful guess about pins is the first step.
> Next is a gentle application of power with careful monitoring as you
> go from 3 to 5 to 9 to 12 to 15 to 24. If it’s a negative supply part, good
> luck figuring that out…..
>
> Lots of fun !!!
>
> Bob
>
> > On May 25, 2020, at 10:08 AM, VE7HR <ve7hr at ve7hr.ca> wrote:
> >
> > Let’s ask this another way then,
> > Can anyone point me towards a good basic care and feeding of XO’S
> > The looks on the time nuts landing webpage give 404 errors.
> > After some more searching the web I bet I can figure out the pinout of
> the connector as they all seems to be the same on the timekeeper devices.
> The voltage is marked so that is easy.
> > What are the common electrical tuning voltages and how might you black
> box them?
> > Are old ones bipolar or unipolar?  I will experiment but like to keep
> the smoke in the can.
> >
> > Any help is appreciated.
> > Thanks
> > Dave
> > VE7HR
> >
> > Sent from my iPad
> >
> >> On May 25, 2020, at 5:05 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
> >>
> >> Hi
> >>
> >> Both part numbers are “OEM” numbers. In both cases, the official company
> >> policy is to not hand out the specs. There are a number of reasons for
> this,
> >> including the time needed to dig out the latest spec. (it’s not as easy
> to go
> >> through 50+ years and > 60,000 paper specs as it might seem …). The
> other
> >> driver is that they like selling spares …..
> >>
> >> Bob
> >>
> >>> On May 24, 2020, at 7:30 PM, Dave Miller <ve7hr at ve7hr.ca> wrote:
> >>>
> >>> I did a bit of Googling and have come up with nothing so I joined up to
> >>> this list and will ask a few questions.
> >>>
> >>> Looking for a data sheet for Vectron Model 207-5916. I know it's
> 10MHz. It
> >>> seems to produce an output powered by 12V and I expect the white wire
> is
> >>> for the wiper of the frequency adjusting pot.
> >>> That was just a WAG based on the colours of the wires on the connector.
> >>>
> >>> Second one is a Wenzel 500-0481. If I recall, I called Wenzel a while
> ago
> >>> and they would not give me a pinout as it was a proprietary parts
> number.
> >>>
> >>> Is there a standard on the- multi pin connector. It's marked 12V 10Mhz.
> >>> They also wanted me to send them in for calibration as they said it
> was so
> >>> old they were curious to see what frequency it was. It's a virgin with
> >>> no wire ever soldered to it so I can't guess the wiring.
> >>> I did not send it in as the shipping and calibration charges were
> >>> significant.
> >>>
> >>> While I wait for my 5372A I have the Vectron warming up connected to
> >>> Timelabs with a talk only HP counter.
> >>>
> >>> Thanks
> >>> Dave
> >>>
> >>>
> >>> --
> >>> 72 de Dave
> >>> VE7HR
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> >>
> >>
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-- 
72 de Dave
VE7HR