Re: multi-antenna handling

Matteo Cypriani <[email protected]> Wed, 25 Jun 2014 09:09:01 -0400

Newsgroups	org.netbsd.radiotap
Message-ID	<[email protected]>

Hi there,

On Wed, 25 Jun 2014 09:04:49 +0200, Johannes Berg <[email protected]>
wrote:
> > Context: somebody asked on ask.wireshark.org about a capture from a
> > D-Link router running OpenWRT; he claims that the router has 2
> > antennas, but the capture has 3 antenna signal strength values, the
> > first of which is in the first radiotap namespace:
> > 
> > 	http://ask.wireshark.org/questions/33994/why-there-are-3-rssi-values-in-the-radiotap-header-for-a-dual-antenna-wireless-card
> 
> That's a bit strange - might be a driver quirk. The code I wrote has to
> rely on the driver, adding Felix who might know more, I don't know how
> ath9k works in this regard.

I observed the same on TP-Link TL-WDR3500 (which is also ath9k-based), and
assumed the signal in the first namespace was an average of the two others.
Should I understand this may be a wrong assumption?

  Matteo

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