Hi The gotcah (as many here have found out the hard way) is that the OCXO is indeed a +5V part and not a +12V unit. Apparently the internal Chinese market has them mis-labeld. That bleeds over into the listings you see on eBay. There are a *lot* of mistaken listings ….
Bob > On Aug 22, 2015, at 2:02 PM, Bob <[email protected]> wrote: > > Hi Arthur, > Thank you for this information. I have not received my board yet, I probably > still have a few weeks to go. The LT1764 will take up to 20V, but I would > never go to the edge. You could easily do 12V, the only downside is the > dissipation in the LT17654. Use a variable power supply and raise the > voltage slowly. Monitor the temperature with a thermocouple, IR spot meter > (radio shack had one for $10), or just use your finger. If you can keep your > finger on it comfortable for a long period of time, the temp should be OK. > The junction temp is rated for 125C. > > Now on the flips side, my only concern is the regulator is not supplying the > oven power. Most Trimble OCXOs I see on Ebay are powered by +12. When > supplying only 6.5V the oven might not get up to temp producing frequency > instability and some erratic EFC stats. > > See below, here is a 73090 OCXO (same as on some of those GPSDO boards) > powered by +12V. It's possible the regulator is meant to be powered from > +12V, supplying power to the digital logic and to the oscillator portion of > the OCXO. Then +12V directly supplies the oven. > > http://www.ebay.com/itm/10-000000MHz-Trimble-Double-Oven-OCXO-Trimble-73090-Double-sinewave-15V-12V-/251883335405?hash=item3aa56aaeed > > I will post my success and let everyone know how I make out. I purchased > this to have a backup for my Z3801 & Z3805. Both are on the fritz, I will be > post those trials and tribulations on a new thread. Thanks so much for your > response. > > Bob > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
