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

paul swed paulswedb at gmail.com
Mon Jun 17 14:37:50 EDT 2013


Chris it does indeed use the carrier and thats the issue. Even though it
never had any rel value to the clock. See my other comment on the other
thread.
Regards
Paul.


On Mon, Jun 17, 2013 at 2:12 PM, Chris Albertson
<albertson.chris at gmail.com>wrote:

> Yes, I see what it does.   It is a simple circuit.  But I just thought
> (wrongly, now I see)  that the 8170 somehow used the 60KHz signal for some
> purpose.  I gues not,  It is just a carrier that is discarded.
>
> Some receivers used the 60HKz signal as a 60KHz frequency reference and
> phase locked their internal clock to the 60KHz signal.  I gues the 8170
> does not do that.
>
>
> On Mon, Jun 17, 2013 at 10:56 AM, Burt I. Weiner <biwa at att.net> wrote:
>
> > 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
> >
> >  From: Chris Albertson <albertson.chris at gmail.com>
> >>
> >>         <time-nuts at febo.com>
> >> Subject: Re: [time-nuts] WWVB remodulator for the spectracom 8170 the
> >>
> >>
> >> I'm looking at the schematic.  I thought the goal was to get the 60KHz
> >> signal from WWVB to the HP unit.  This schematic sends an approximatly
> >> 60KHz signal from the tuning fork to the HP. but copies the AM
> modulation
> >> from WWVB.   So the 8170 does not look at the 60KHz carrier? and only
> cars
> >> about the time code?
> >>
> >> Maybe another way then is to bypasss the radio inside the 8170 and just
> >> send the demodulated logic bit
> >>
> >>
> > Burt I. Weiner Associates
> > Broadcast Technical Services
> > Glendale, California  U.S.A.
> > biwa at att.net
> > www.biwa.cc
> > K6OQK
> > ______________________________**_________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/**
> > mailman/listinfo/time-nuts<
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
> > and follow the instructions there.
> >
>
>
>
> --
>
> Chris Albertson
> Redondo Beach, California
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>


More information about the time-nuts mailing list