The EROS-800 versions had no EFC. Only the EROS-750 versions had EFC. Jerry N9XR
On Sun, Jun 14, 2015 at 10:26 AM, Bob Camp <kb...@n1k.org> wrote: > Hi > > Best guess is that the 4 pins are: > > Power > Ground > EFC > Output > > An ohm meter is your friend in this case. > > Ground should be shorted to the case. > Output should be DC blocked (as in > 1 meg ohm) > EFC should be something like 100K or so to ground > Power should have a fairly big cap on it, the ohm meter will go up in > resistance slowly. > > In some cases the output has an attenuator (pad) on it. That will give you > something like > < 300 ohms (but not a short) to ground. The EFC might be any impedance > from 10K on up. > > If your ohm meter will read capacitance, that’s a great way to spot the > input capacitor on the > power pin. The EFC may have a bypass, but the power pin should have a much > larger one. > > Once you have that worked out, check your results: > > Apply power through a 1K ohm resistor. It should come up to a a few volts > (< 8V). Don’t > leave it in this condition for long. You are simply trying to make sure > you have EFC > and power straight. If you apply +12 to the EFC through 1K, it will go up > to roughly > 12V. The same is true applying power through 1K to a DC blocked output > pin. > > Now apply +12 to the power pin with a current limited supply. It should > pull less than 1A. > If it does, leave it on power and see if there is an output. If it’s got > an output, you have > things worked out correctly. If it has no output then either you have the > pins wrong or the unit > is defective. > > Good Luck! This is not a prefect way to do it, but it works in about 90% > of the cases. It’s fairly > safe in this case. You already know that the power supply is +12V. > > Bob > > > > On Jun 14, 2015, at 5:41 AM, Mod Mix <mod...@t-online.de> wrote: > > > > Hi, > > > > got an ERC Precision Crystal Oscillator EROS-800-NTL-5 OCXO 9.9000000 > MHz +12V RF (ebay item no. 140779678375). > > Can not find any data sheet to see which of the four pins is used for > what, though. > > Any help would be much appreciated. > > > > TIA > > Ulli > > > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@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@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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.