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

[Chris Albertson]

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
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-- 

Chris Albertson
Redondo Beach, California