Hi > On Feb 4, 2021, at 11:37 AM, Avamander <[email protected]> wrote: > > > 2) Grab any of the various conversion chips to take the 10 MHz to 54 > (= I don’t know of a standard that puts out 54 MHz). Wire the 10 into it > and pull the 54 off of it. (Yes, the chip needs to be programmed and > there will be various bits and pieces connected to it) > > Do you have any recommendations as to which chip would let me achieve this?
Only because you can get it as a pre-assembled dev board: https://www.silabs.com/timing/clock-generators/cmos/device.si5350c-gm1 at a semi-rational price. Most modern chips are a bit difficult to deal with. That makes finding a dev board important. If you are set up to layout and assemble SMT PCB’s then there are a lot of choices ( as in several hundred devices). Bob > > In any case, thanks for the help. I will try and document the process when I > start it and share it here, might be interesting for some. > > On Thu, Feb 4, 2021 at 5:15 PM Bob kb8tq <[email protected] > <mailto:[email protected]>> wrote: > Hi > > Pretty basic approach: > > 1) Get a Rb standard. > > 2) Grab any of the various conversion chips to take the 10 MHz to 54 > (= I don’t know of a standard that puts out 54 MHz). Wire the 10 into it > and pull the 54 off of it. (Yes, the chip needs to be programmed and > there will be various bits and pieces connected to it) > > 3) Rip the oscillator (or crystal) off the RPi board. > > 4) Figure out which pin is the drive to the crystal and which is the return. > (or which is the output if it’s an oscillator) > > 5) Wire the 54 MHz into the return / osc out pin. > > 6) Power it all up off of a common supply ( = power the conversion > chip off the RPi’s regulator. > > Yes there is a lot of research needed to complete all of that. > > When done you would need to figure out how to ( … if you can ) disable > the spread spectrum stuff on the clock. You still would be stuck with > the normal issues related to clock frequency stepping ( turbo mode …). > How much of that actually gets you on an RPi 4 … who knows. > > Bob > > > On Feb 4, 2021, at 5:20 AM, Avamander <[email protected] > > <mailto:[email protected]>> wrote: > > > > Hi, > > > > I was wondering if anyone here has replaced the 54 MHz oscillator on the > > Raspberry Pi 4 with a GNSS-disciplined rubidium standard? An overkill > > upgrade, but is technically doable? What hardware would it take in addition > > to a GNSS-disciplined rubidium standard and a Pi 4? > > > > Here's where I got my inspiration from, someone replacing the oscillator on > > a Pi 3 with a TXCO: > > https://raspberrypi.stackexchange.com/questions/74482/switch-out-the-x1-oscillator-on-a-rpi-2-3 > > > > <https://raspberrypi.stackexchange.com/questions/74482/switch-out-the-x1-oscillator-on-a-rpi-2-3> > > > > > > Yours sincerely, > > Avamander > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > <mailto:[email protected]> > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > <http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com> > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > <mailto:[email protected]> > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > <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.
