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 <[email protected]> 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 <[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. > -- 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.
