[Discuss-gnuradio] USRP2+WBX full duplex doesn't receive

[Marc Epard]

I'm trying to simultaneously transmit and receive with a USRP2 and WBX in a C++ 
command line tool. I'm using txrx_wbx_raw_eth_20100608.bin and 
u2_rev3-20100603.bin on the USRP2 and have tried GNU Radio version 3.3.0 and 
3.3.1 on the Ubuntu 10.04 host. I have a spectrum analyzer on TX/RX and an 
antenna on RX2.

Transmitting without receiving works fine, as does receiving without 
transmitting. If I attempt to do both at the same time, the receive thread gets 
stuck -- that is rx_samples doesn't call the rx_sample_handler so I never 
receive the data I'm after. The transmit thread keeps running and I can see the 
transmitted signal on the spectrum analyzer. I've set breakpoints in various 
places in the USRP2 host code and as near as I can tell, there are no packets 
being received (poll times out each time it's called in eth_buffer::rx_frames).

What am I missing? Is full duplex supported using raw ethernet with the WBX?

-Marc