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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
