[time-nuts] wifi with time sync

Bob Camp kb8tq at n1k.org
Sat Jan 14 10:48:30 EST 2017


This is very much a one laptop to one router issue. The other couple dozen laptops
and tablets do not see an issue. The whole thing started when a series of firmware 
updates rolled through a few weeks ago. The laptop is *maybe* 12 feet from the router.
It’s running at 5 GHz so microwaves (and a lot of other stuff) are not an issue. 


> On Jan 14, 2017, at 1:15 AM, Chuck Harris <cfharris at erols.com> wrote:
> If there is a modern microwave oven with a switching power supply,
> or a cordless telephone around, you might want to look there.
> The old linear supply ovens were easy to deal with because they
> presented a strong CW signal that drifted around as voltage, load,
> and temperature changed.  The switcher ovens simply splatter the
> whole ISM band with strong microwave noise.
> -Chuck Harris
> Bob Camp wrote:
>> Hi
>> It just so happens that I’m trying to track down an issue with my WiFi as
>> I type this. My *guess* is that there is a dropout going on. The only easy
>> way I can see to get a round trip time with a high data rate is to run ping. 
>> It’s the only tool that gives me something that is fast enough to spot issues.
>> Is it perfect? certainly not. Is it an upper bound that is also likely the limit
>> for things like NTP - in my experience it sure is. That of course assumes 
>> the gizmo that sends the pings back does so quickly and consistently. I’ve
>> spent enough time testing that side of it that I’m quite sure it’s true in this case.
>> Bob
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