[Nottingham] The arguments with WiFi continue

[Luke]

Inclined to agree with Martin. I wonder if you could list out any
electronics within the immediate vicinity of the set up. You tried them
off, I'm assuming none were in standby, so it's probably creeping in
from elsewhere (if RFI is the issue). Still worth a triple-check.

Ferrites on the leads, swapping out HDMI cables as I mentioned
previously (or temporarily disconnecting). It's not just the frequencies
the bad electronics leak at, but the 2nd and 3rd harmonics that can get
you. You could also try like Martin says temporarily shielding the area
with foil, re-siting the gear and confirming it's RFI by swapping out
parts. I know, I know, but still...

Finally, do you have any knowledge of your neighbours' electronics at
all? Those power socket range extenders are a nightmare for RFI. If
something of theirs is getting into their AC circuits you could be hosed
until chokes are fitted etc. Try an AM radio on static and see if you
can find any spikes on the neighbour sides. Also try cutting your power
to rule yourself out :)

That's all I've got for now. Sounds like you've got an external gremlin
if you've checked everything in-house so thoroughly. Keep us posted.

Luke


On Mon, May 16, 2016 at 12:47:39AM +0100, Martin via Nottingham wrote:
> On 15/05/16 20:33, Jason Irwin via Nottingham wrote:
> > I knew Broadcom were the work of the devil, but I thought Intel was
> > meant to be OK.
> > 
> > I tried a USB antenna borrowed from a Pi (LB-Link thing that's reported
> > as "Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter").
> > It'll only connect to 2.4Ghz but is 11n and it reports ~19Mbits/sec just
> > like the internal card and the phone for the 2.4Ghz network.
> > The antenna is claimed to deliver 150Mbps:
> > https://www.adafruit.com/products/1030#technical-details-anchor
> > 
> > J.
> 
> Are your devices "MIMO" enabled and with suitable multiple antennas?...
> 
> 
> See:
> 
> http://www.dd-wrt.com/wiki/index.php/Wireless-N_Configuration#20MHz_vs_40MHz
> 
> ... and:
> 
> http://nottingham.lug.org.uk/2013/01/what-wifi-channel/3840
> 
> 
> And you may need some aluminium foil shielding/wallcoverings to keep the
> neighbours out!
> 
> 
> Good luck?
> 
> Cheers,
> Martin
> 
> 
> 
> 
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