On Tue, Mar 15, 2011 at 3:03 PM, William Cox <wc...@ncsu.edu> wrote:

> I'm trying to run tunnel.py on my Atom PC with a USRP 1 hooked up. I'm
> attemping to run it with a Fc of 4 Mhz and the standard values (Basic RX and
> LF Tx daughterboards).
> The terminal window is filling up with the "B character and I can't
> determine a) why that's happening and b) where it's coming from.
> Thoughts?
> Thanks.
> -William
>

The "B" is part of our "CSMA" MAC layer telling you that it's blocked from
transmitting due to high received signal strength in the channel.  You can
play with the threshold level for the detection with the -c option.

Tom
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