Re: Intermittent WiFi on Network Manager

[gene heskett <gheskett@shentel.net>]

On 10/8/23 07:43, Lee wrote:
> On 10/7/23, Ottavio Caruso <ottavio2006-usenet2012@yahoo.com> wrote:
> > Am 07/10/2023 um 11:11 schrieb gene heskett:
> > > Another possibility is a leaky microwave oven in the vicinity
> >
> > This is an urban legend and an excuse I was using when I was in tech
> > support.
>
> It's real.  Try it yourself - run iperf for 2 minutes, display the
> bandwidth report every second and then start the microwave for 1
> minute.
>
> I get the thruput cut in half or or more when the microwave is on.
> Which is an improvement on the previous microwave which used to kill a
> wireless connection. (which was super annoying when the wife was doing
> work-from-home & I wasn't allowed to use the microwave _at_all_ during
> the day.  I suspect that's the reason she got a toaster oven)
>
> Is it fairly well-known that microwave ovens interfere the most on channel 11?
> I just tried linssid again and there's a bunch of APs on channel 1 &
> 6, one on channel 2 and two on channel 8.  Nothing on channel 11.
>
> Lee

That, again probably, would be because the microwave does NOT transmit 
an SID, carrier strength would be a giveaway if the receiver could be 
heard, probably as a loud 120 or 100 hz(in 50 cycle nations) hum. High 
voltage caps are expen$ive so the HV supply that powers the magnetron is 
rarely filtered, just rectified.  The normal wifi modulation mode is 
FSK, often with a modified to an NRZ to balance the energy levels in 
each state. That I'd have to look it up and don't have a copy of that 
particular CFR rulebook to check.
> .

Cheers, Gene Heskett.
--
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