14 bit On Mon, Apr 16, 2018, 8:00 AM jimlux <jim...@earthlink.net> wrote:
> On 4/16/18 3:45 AM, Pete Lancashire wrote: > > Access to " the xtal" is not an option the SDR is enclosed in a metal > box. > > > > Do a web search for RSP2Pro > > > > > > It does have an external reference input.. > There's not a lot of info on the Mirics data sheets (or on the sdrplay > website) > > It sort of looks like this is a somewhat enhanced version of the parts > used in the RTL-SDR dongles. > (10 bit ADC, instead of 8 bits in the RTL2832) > > And of course it needs 24MHz because it has to run the USB interface. > > 10 bit ADC means that you probably don't need *outstanding* clock > performance - the sample and hold and all the other timing logic is > probably designed to that sort of performance level - getting > femtosecond jitter probably isn't worth it. > > > If you're just looking for a 24 MHz driver that doesn't need to be > locked to anything, one of the SiTime modules would work, or you could > probably order a TCXO for 24 MHz - it's a standard frequency (viz. USB), > so it's almost certainly available from stock > > > > > On Sun, Apr 15, 2018, 6:00 AM Attila Kinali <att...@kinali.ch> wrote: > > > >> On Wed, 11 Apr 2018 03:00:23 -0700 > >> Pete Lancashire <p...@petelancashire.com> wrote: > >> > >>> Needed for SDR project as external clock source. > >> > >> If your goal is, as Jim guessed, to get 24MHz from 10MHz and > >> you are using something like an RTL-SDR, then how about just > >> passing the 10MHz through a CMOS gate to square it up and > >> get nice harmonics, then pass a wire close to the crystal. > >> This should injection lock the crystal to right frequency. > >> It wont be a strong lock due to the 5:12 ratio, but for something > >> like a crystal that is already quite close, that should do the trick. > >> > >> Alternatively, using an ADF4002 with a small uC to configure it > >> and a VCXO/VCO should also work. > >> > >> Attila Kinali > >> -- > >> <JaberWorky> The bad part of Zurich is where the degenerates > >> throw DARK chocolate at you. > >> _______________________________________________ > >> time-nuts mailing list -- email@example.com > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- firstname.lastname@example.org > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > _______________________________________________ > time-nuts mailing list -- email@example.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- firstname.lastname@example.org To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.