[time-nuts] WWVB SDR discussion

[Phil Genera]

Has anyone probed the test points (which Tom so kindly took pictures of) to
find the pps & i2c lines between the es100 and clock face microcontroller
on one of these?

I'd like to build a WWVB refclock for fun, but with the
universal-solder dev board discontinued, buying a wall clock seems like the
easiest way to get a receiver, plus there's plenty of room in the battery
compartment for a raspberry pi zero, if you leave the batteries out... I'm
hesitant to buy one just to pull it apart and find the signals I'm looking
for are hard to get out, though.

-- 
Phil


-----Original Message-----
> From: time-nuts <time-nuts-bounces at lists.febo.com> On Behalf Of Tom Van
> Baak
> Sent: Tuesday, August 11, 2020 6:45 AM
> To: time-nuts at lists.febo.com
> Subject: Re: [time-nuts] WWVB SDR discussion
>
>
>
> Ray,
>
>
>
> I don't see a crystal filter. There is a 16 MHz crystal, but that's for the
> processor.
>
>
>
> "Inside the La Crosse 1235UA UltrAtomic Radio Controlled WWVB (Atomic) Wall
> Clock"
>
>  <http://leapsecond.com/pages/ultratomic/>
> http://leapsecond.com/pages/ultratomic/
>
>
>
> "ES100 datasheet, including block diagram, application circuit, and theory"
>
>  <http://leapsecond.com/pages/es100/ES100DataSheetver0p97.pdf>
> http://leapsecond.com/pages/es100/ES100DataSheetver0p97.pdf
>
>
>
> "Universal Solder ES100 cob dev kit"
>
>  <http://leapsecond.com/pages/es100/pins.htm>
> http://leapsecond.com/pages/es100/pins.htm
>
>
>
> /tvb
>
>
>
>
>
> On 8/10/2020 11:09 PM,  <mailto:rcbuck at atcelectronics.com>
> rcbuck at atcelectronics.com wrote:
>
> > Does the La Crosse UltrAtomic clock actually use a crystal filter or
>
> > do they digitally filter the signal? Has anyone ever looked inside of
>
> > one of the clocks? Just curious.
>
> >
>
> > Ray
>
> > AB7HE
>
> >
>
>
>
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