[time-nuts] Re: WWVB \/=\/ Wi-Fi

[S McGrath]

It's probably the old standard,  fundamental overload.   This is where
the RF stage is overloaded with a strong out of band signal which is
sufficiently powerful to overload the receiver - in an old school car
radio listening to Station A,  you then drive by Station B which is at
the opposite end of the band and it comes through instead of Station A
as a practical example the signal is sufficiently powerful that enough
gets through to the detector because there is sufficient signal power
to drive the detector stage directly

On Fri, Sep 2, 2022 at 9:08 PM Greg Troxel via time-nuts
<time-nuts at lists.febo.com> wrote:
>
>
> Brooke Clarke via time-nuts <time-nuts at lists.febo.com> writes:
>
> > My La Crosse UltrAtomic Clock was replaced by the factory because of
> > erratic behavior.  The replacement clock ended up displaying 6:00 most
> > of the time and occasionally spinning hands and stopping at the wrong
> > time.
> > https://prc68.com/I/Loop.shtml#La_Crosse_UltrAtomic
> > The hour hand came loose, hence the 6 o'clock reading.  But the minute
> > hand was still frozen at straight up except when spinning.
> >
> > A friend got a La Crosse S841047 Wireless Forecast Station that
> > synchronizes to WWVB and it had a problem locking to the signal.
> > It turns out this problem was caused by Wi-Fi signals.  When moved to
> > a location removed from Wi-Fi (routers and laptops/phones) it worked.
> > https://prc68.com/I/Weather.shtml#S84107
> > https://prc68.com/I/AgilentE4404B.shtml#Fig_29 <- spectrum analyzer showing 3 Wi-Fi routers
>
> Do you believe that the wifi signals themselves are causing problems?
>
> Have you checked the alternative hypothesis that the cheesy switch-mode
> power supplies powering the wifi access point and everything else (and
> internal to those devices to drop 12V or whatever to 5V and 3.3V) are
> causing interference at 60 kHz?
>
> If it really is the 2.4 GHz signal, do you think that's getting into the
> 60 kHz receive chain by some nonlinear element, or getting into other
> parts of the circuit, or ?
>
> Greg
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