FWIW we've played with various SMA-to-SFP converter boards in the lab for 10MHz or 100MHz distribution.
A bare-bones SFP board is e.g. https://github.com/aewallin/SFP-Breakout-Board That interfaces directly to the differential AC-coupled TX and RX pins of an SFP. If you want some buffering (and limited bandwidth at the same time) you can put an op-amp as a buffer and a transformer to convert to/from the differential TX/RX. Here's a design I've used https://github.com/aewallin/SFP2SMA_2018.03 We also made a box around that board: http://www.anderswallin.net/2020/12/sfp-board-in-a-box/ If your requirements are somewhere in 1e-14 or worse then this type of passive frequency distribution should work fine for maybe a few km fiber runs. Anders On Mon, Aug 30, 2021 at 8:13 AM Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > -------- > David I. Emery writes: > > On Sun, Aug 29, 2021 at 10:43:51AM -0400, paul swed wrote: > > > Not completely clear what the common > > mode Z of the things is at 10 MHz... > > Twisted pair is 135 Ohm. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send > an email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
