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 <[email protected]> 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 -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
