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Date:      Tue, 08 Oct 2013 20:49:20 +0200
From:      "Julian H. Stacey" <jhs@berklix.com>
To:        freebsd-current@freebsd.org
Cc:        Alfred Perlstein <bright@mu.org>
Subject:   Re: urtwn driver for Edimax EW-7811U WLAN nano USB Adapter 
Message-ID:  <201310081849.r98InKOn057406@fire.js.berklix.net>
In-Reply-To: Your message "Tue, 08 Oct 2013 19:41:37 %2B0200."

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> I too am seeing
> 	urtwn0: timeout waiting for checksum report
&
	urtwn0: at uhub3, port 3, addr 4 (disconnected)
(BTW there's no external hub, uhub3 must be inside laptop, 
& there's no loose connection, laptop was not touched, all work was remote)

PS a typical sample comparison of scanned signal strengths 
of one of the ~15 nets localy:
 54M -49:-86  100 EP   RSN WPA WME    run0 big stick, 
 54M -69:-95  100 EP   RSN WPA WME    urtwn0 nano edimax EW-7811Un
so the edimax is typically down about 20 on left column on all ~15 local nets.

The aerial must be a minute fraction of the wavelength.
I suppose wavelengths are is approx:
	3 x 10^8 metre/second / 2.4 GHz = 3/2.4 x 10^(8-9) m = 12.5 cm
	& ~6cm for 5GHz band.

Cheers,
Julian
-- 
Julian Stacey, BSD Unix Linux C Sys Eng Consultant, Munich http://berklix.com
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