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

[Bob kb8tq]

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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