Re: [Make-wifi-fast] It's hardware eval time again (basic hardware selection)

[Bob McMahon <bob.mcmahon@broadcom.com>]

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Just an FYI for those testing wi-fi.  Telemakus makes a combo attenuator
(0-65 dB) and phase shifter (0-410 degree) that might be of interest.  It's
not shown on their web site  http://wwww.telemakus.com so contact them
directly if this is of interest.

For traffic, iperf 2.0.8 has UDP end/end latency (+ more, including
RTT/CWND) though assumes all the clocks are synched with something like
PTP.  A quality oscillator to act as PTP grandmaster helps much.  I use a
GPS disciplined TCXO but a free wheeling OCXO would work just as well.
https://sourceforge.net/projects/iperf2/

Also, one may want to see if the wi-fi cards can provide phy chan
information so one can plot magnitude/phase/condition numbers with
something like gnu octave.  This can help isolate any phy related issues
particularly when calibrating a controlled environment.

Bob

On Fri, Feb 19, 2016 at 11:43 AM, David Lang <david@lang.hm> wrote:

> On Sat, 13 Feb 2016, Dave Täht wrote:
>
> I have an increasing desire to build (or buy if one exists) a couple
>> boxes that can "aircap" packet capture across as many bands as possible,
>> in these locations (and elsewhere, if people here are interested)
>>
>
> while they won't do -ac, the wndr3800 is available for <$30 each on ebay,
> you just need a remote disk to stream the capture data to.
>
> the number of channels you can listen to is limited to how many you want
> to have running in a stack :-)
>
> David Lang
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>
>

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