I would also suggest that a simple frequency doubling if using a differential output op-amp is too hard would get one there. Something like a balanced lm/mc1496 mixer will double the input frequency if the inputs are the same.
IMHO it's tempting to use software where simple (cheap! LM1496 is about $0.80/each on Digikey) analog hardware will do the trick. But it's the same math whether an analog circuit is doing it by design or if software is doing it. -T On Sat, Aug 1, 2020, 09:00 <[email protected]> wrote: > Date: Fri, 31 Jul 2020 21:00:13 +0000 > From: "Poul-Henning Kamp" <[email protected]> > To: Discussion of precise time and frequency measurement > <[email protected]>, Bob kb8tq <[email protected]> > Subject: Re: [time-nuts] WWVB PM Time Questions > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > -------- > Bob kb8tq writes: > > >The WWVB modulation is *very* predictable. Once you have lock, > >you can guess just about every phase reversal you will see. > >[...] > >The point of this being that you *could* pre-flip the data before it > >went into a buffer. That way the buffer integration time constant > >could be quite long. > > I would just use two buffers and decide which one based on the > prediction, that way DC-offsets will not cause trouble. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | 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 -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
