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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