There are inexpensive CODECs or A-->D converters that are designed for audio, that can be clocked up to 192 ksps or 200 ksps with 24 bit resolution. (Typically 18 or 19 effective bits, 3.0 V p-to-p full scale) They have built in Nyquist filters that scale with the sampling frequency, so a Nyquist frequency of 100 kHz is very comfortable for receiving a 60 kHz signal. They use standard I2S audio interface, although other interfaces are typically options.
After that it is SMOP, as they say. (Simple Matter Of Programming). :-) --- Graham == On Fri, Oct 9, 2020 at 12:58 PM paul swed <paulsw...@gmail.com> wrote: > after the bpsk is removed true. I have done that. A simple RC filter and a > 100K over 50ohm divider to get the signal to a reasonable level. Add a > coupling cap because all of the old receivers output a preamp voltage. > > On Fri, Oct 9, 2020 at 11:35 AM Bob kb8tq <kb...@n1k.org> wrote: > > > Hi > > > > For a full setup, you could do it a lot of ways. A setup of: > > > > Antenna -> front end -> ADC -> MCU -> D/A would be one approach. Various > > bits like a local clock also would get into the design. There are *many* > > other > > approaches. > > > > ========== > > > > There are a lot of D/A’s that will clock in the 100’s of KHz range. If > you > > are only > > trying to come up with an analog of a WWVB signal the “10 bit” D/A’s > found > > in > > some MCU’s would do the trick. In the setup above, the ADC would likely > be > > harder to come up with than the DAC. > > > > Since you are only trying to come up with a carrier, the need for a D/A > is > > not > > an absolute one. Taking a square wave of some sort and filtering it a bit > > would > > be adequate to drive most of these old WWVB receivers. > > > > Bob > > > > > On Oct 8, 2020, at 11:42 PM, Hal Murray <hmur...@megapathdsl.net> > wrote: > > > > > > > > > I assume it needs an antenna, front end, and D/A. > > > > > > What's available in the way of D/A that's good for 60KHz? Is the > > problem > > > easier if the D/A box has external clocking? > > > > > > -- > > > These are my opinions. I hate spam. > > > > > > > > > > > > > > > _______________________________________________ > > > time-nuts mailing list -- time-nuts@lists.febo.com > > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > and follow the instructions there. > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.