[time-nuts] IC Used In WWVB Receiver (Link In E-Mail)

[John C. Westmoreland, P.E.]

Thanks for the response Bill.

I think the IC used is more than likely from C-MAX - a datasheet that could
be close to what's on that PCBA is:

https://upverter.com/datasheet/b2bfa7dae24a50cf9e867ab08e669047ebc91046.pdf

But, would be nice to know for sure.  C-MAX does (or did) provide IC's in
die form - could explain the epoxy ball on the PCBA.

The MAS boards are here also:

https://www.amazon.com/CANADUINO-Atomic-Clock-Receiver-60kHz/dp/B01KH3VEGS
https://www.universal-solder.ca/product/canaduino-60khz-atomic-clock-receiver-module-wwvb-msf-jjy60/

73's,
John
AJ6BC


On Mon, Sep 21, 2020 at 8:11 PM Bill Byrom <time at radio.sent.com> wrote:

> I don't have one of those modules. But I believe that most or all such low
> cost WWVB modules sold on Amazon (and similar distribution sources) use an
> IC from a Finnish company (Micro Analog Systems). They have produced
> several different chips over the past 16 years for use in clocks which are
> synchronized from WWWB and other VLF time signals. They all appear to
> decode the AM amplitude only (ASK ,but no BPSK demodulation). So they don't
> provide any frequency or phase information from the signal, and are only
> meant to provide a demodulated digital stream to a controller which drives
> a display for date and time display to 1 second resolution.
>
> The older modules seem to use the MAS10106B AM receiver IC , which has a
> single-ended antenna input. The datasheets I can find are dated January,
> 2004, and this IC seems to be discontinued.
>
> The later modules seem to use the MAS6180C AM receiver IC, which has a
> differential antenna input and so better noise rejection (which can be a
> big problem for time code receivers). The datasheets I can find are dated
> September 2014.
>
> These are tuned RF receivers and are used with a resonant ferrite antenna
> and crystal which is resonant at the operating frequency. These IC's work
> with DCF77 (77.5 kHz), HGB (75 kHz), MSF (60 kHz), WWVB (60 kHz), JJY (40
> and 60 kHz), or BPC (68.5 kHz) crystals. The crystals are ground to a 3 Hz
> higher frequency (except 5 Hz higher for 68.5 kHz). Stray capacitance below
> 1 pF can affect the crystal resonant frequency. See:
> https://www.mas-oy.com/portfolio/mas6180c/
> https://www.datasheetq.com/datasheet-download/477051/1/MAS-Oy/MAS1016BTB1
> --
> Bill Byrom N5BB
>
>
>
> On Mon, Sep 21, 2020, at 7:25 PM, John C. Westmoreland, P.E. wrote:
> > Hello Time Nuts,
> >
> > Does anyone know which IC is used in the following:
> > (Note:  Links have been sanitized by the list moderator.)
> >
> > WWVB Receiver on Amazon
> > <
> https://www.amazon.com/Alano-Controlled-Modules-Receiver-Operating/dp/B07RYK5KN6
> >
> >
> > It also comes with a clock module:
> >
> > With Clock Module
> > <
> https://www.amazon.com/ALANO-Controlled-Receiver-Modules-Operating/dp/B07YD2XCFL
> >
> >
> > Thanks In Advance!
> >
> > 73's,
> > John
> > AJ6BC
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at lists.febo.com
> > To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> > and follow the instructions there.
> >
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>