[time-nuts] WWVB remodulator for the Spectracom 8170...

[paul swed]

Jerry only the am data shows up on a pin. No carrier. Thats why the tuning
fork 60 Khz xtal to make a fake stable carrier.
Regards
Paul
WB8TSL



On Mon, Jun 17, 2013 at 5:54 PM, <gsteinba52 at aol.com> wrote:

> I can never figure out how to post here...
>
> This may not work. From what I remember, the "Atomic' wall clocks and
> watches only listen for WWVB a couple of times a day to conserve battery
> life - usually at night when propagation would be best. I don't know if the
> 60kHz signal is even available on a pin...
>
> Jerry S.
>
>
>
> Burt I. Weiner     biwa at att.net
>     Mon Jun 17 13:56:17 EDT 2013
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>
> Chris,
>
> I think Paul really came up with an elegant answer.  As you well
> know, the problem with the new format and phase locked receivers is
> that WWVB's phase is now being shifted for the new encoding
> scheme.  It's this phase shifting that's messing up the phase locked
> receivers like the Spectracom 8170.  Part of Paul's circuit generates
> a new 60 kHz signal that's not phase shifted.  The receiver portion
> of his circuit decodes the dips that WWVB still transmits, and
> outputs the data which is used to turn on and off a "switch" that
> drops the new 60 kHz signal by approximately 14 dB in sync with the
> WWVB dips.  I'm going to build this circuit, but I'm planning on
> using the receive module out of one of the many "Atomic Clocks" that
> I have around.  I guess you could ask, Why don't I just put the
> Atomic clock on the wall in my shoppe and forget about the 8170?  An
> honest answer to that is, that's no fun.
>
> In a sense you could say that Paul's circuit does get the WWVB signal
> to the receiver - it's just a new phase stable version of the signal
> signal.  This way I don't have to mess with the insides of the 8170.
>
> Burt, K6OQK
>
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