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

[Graham / KE9H]

I see a lot of radio noise close to 60 kHz in the vicinity of my WiFi
router, but I suspect it has more to do with the Ethernet and router logic
in an unshielded plastic box than the 2.4 Ghz signals themselves.

Other offenders are harmonics from the 60 Hz flat screen displays and the
video signals driving them.
And the little adaptors that you might use on the back of the flat screen
to convert between various video connectors, that break the shielding
between the cables and the display.
--- Graham

==

On Fri, Sep 2, 2022 at 8:08 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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