request for testing: please test -head ath 11n stuff

[Kevin Oberman]

On Mon, Apr 9, 2012 at 12:26 PM, Lev Serebryakov <lev at freebsd.org> wrote:
> Hello, Adrian.
> You wrote 9 апреля 2012 г., 22:30:14:
>
>> Does that fancy bit of equipment work in some kind of spectrum
>> analyser mode? I wonder what _kind_ of signal you're seeing.
>  It works only in spectrum analyzer mode (it doesn't know anything
> about WiFi & Ko, all WiFi-related "annotating" info is extracted from
> regular WiFi adapter), and it shows very limited in bandwidth (exactly
> channel 6-centered 802.11g transmission, with almost no signal outside
> this band) very strong (-10 -- -15 dBi) signal, when my AP was
> detected as -40 dBi (when my AP is on channel 1 and transmitting, it
> becomes strongest signal on this channel, so it could be easily seen
> at spectorgram). This channel is occuped by 4 or 5 different hotspots
> according to WiFi card, but all of them have very low RSSI.
>
>  It think, it could be surveillance / security camera with non-WiFi
> 2.4 Ghs transmitter, as signal is very uniform -- when WiFi AP or
> client are transmitting here are some regular spots without signal on
> spectorgram and some variance in signal strength, but this signal is
> very stable, without pauses or any significant variation.
>
>  Unfortunately, I didn't take any screenshots, and this card was at my
> home only for 3 hours :)

I suspect that the camera is the culprit. Back about 8 or 9 years ago
I was working on the network at the SuperComputing show and a booth
was using a wireless camera on the 4.2 band. It totally wiped out WiFi
all around that booth. Fortunately, the contract signed by exhibitors
gave the show authority over all wireless and the camera was turned
off.
-- 
R. Kevin Oberman, Network Engineer
E-mail: kob6558 at gmail.com