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

[Brooke Clarke]

Hi Greg:

I suspect the 2.4 & 5.8 GHz Wi-Fi signal are getting into the WWVB receiver because it probably is not designed to shunt 
them.
You might think of it as out of band jamming.

Need to come up with an antenna for LF centered on 6o kHz but with a wider band that the clock uses to see what's there.

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> 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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