urtwn driver for Edimax EW-7811U WLAN nano USB Adapter

Julian H. Stacey jhs at berklix.com
Tue Oct 8 18:49:51 UTC 2013


> 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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