Hi > On Sep 2, 2020, at 1:24 AM, Manfred Bartz <[email protected]> wrote: > > Hi all, > > I bought 2 x 10811 OCXOs for a 10MHz GPSDO project I am working on. > The OCXOs came with an interface board HP 05328-20027, see attached > pictures. > > Questions: > 1. Is it worth keeping the interface board?
They make an adequate “burn in” board. There isn’t a lot of use for them otherwise. > a. If yes, does anyone have the schematic and the data on the ICs? You can trace it out. It’s an ECL doubler or something like that. > b. What is that TO220 device? It’s the 12V regulator to drive the oscillator. The 10811 uses > 20V for the oven and ~ 12V for the oscillator > and > c. why is it mounted on a standoff on the back of the PCB? It shipped that way to keep it safe. It mounts on the chassis of the instrument this board plugged into. > 2. Any advice/caution on matching the OCXO output impedance? 10811 is designed to run into a 50 ohm or 1K ohm load. Most run them into a 50 ohm load. > 3. Any recommendation for a (>= 4-ch) distribution amplifier? Depends a lot on what you are after. I did a post of some op-amp data back a few months. None of them would “preserve” the far removed phase noise of the 10811. > 4. Any advice on a low jitter comparator for further digital processing, > e.g. for a 1pps signal? The previous post about the LTC part is one way to go. A simple biased gate (like that used on the interface board) is another way. A lot depends on just how low “low jitter” needs to be. Bob > > Thanks and 73 > -- > Manfred VK3AES > <HP-10811AB-OCXO-IMG_20200805_201555.jpg><HP-10811AB-OCXO-IMG_20200805_201615.jpg>_______________________________________________ > 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.
