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

[Greg Troxel]

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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