[time-nuts] wtd: WWVB info
pete at petelancashire.com
Wed Aug 5 14:49:52 EDT 2015
There is someone on ebay selling an analog 'movement'
DISCLAIMER: Not associated with the seller
On Wed, Aug 5, 2015 at 4:15 AM, Bob Camp <kb8tq at n1k.org> wrote:
> The front end would be “dealers choice”. He who does the
> project gets to decide what gets used.
> If you look over some other designs, you can indeed get
> a device going with a 12 bit converter. The qualifier is that
> the signal to noise needs to be pretty good. With fades
> and switcher interference, you probably would notice its
> The “other end” of the design spectrum would be with a part
> designed as a high range font end chip. You can get to a lot
> of bits at low frequency. Even the prices aren’t all that crazy.
> Is there one and only one approach here? Not in any way. There
> are several thousand possible ways to do it. AGC or no AGC would
> be a pretty major decision. Next decision would be things like clocks.
> 15 MHz from a ($25) KS box that also puts out 10 MHz looks like a
> pretty good choice at the moment.
> Past that it’s decimators / filters and the usual DSP stuff (or any of
> a dozen alternatives). Given the high noise environment I’d lean towards
> a DSP approach.
> Most of the choices run into the easy / quick / cheap tradeoff triangle.
> sure that the debating process can find a solution that should “cost 10
> cents”. I’m
> also sure that a basement lash up of available parts is quick, but hard to
> I’m not terribly surprised at the lack of 10 cent solutions. I’m a bit
> that there are no unique lash up designs. The debate process seems to
> have made this a pretty un-attractive thing to do.
> > On Aug 4, 2015, at 11:36 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> > kb8tq at n1k.org said:
> >> So far there have not been any home brew design radios show up that will
> >> demodulate and lock to the new data format. There is plenty of info on
> >> transmit format. The demodulation approach is not crazy hard. That said,
> >> there’s still a lot of work to get a receiver running.
> > Has anybody looked into a software approach? What sort of front end
> > you want?
> > --
> > These are my opinions. I hate spam.
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