Hello:
I’m stuck, and I need some help.
I’m running GNU Radio 3.3.0 on openSUSE 11.2. I have two USRP2 boards,
each with a WBX daughterboard, connected to two Intel PRO/1000 GT NICs,
on eth1 and eth2. I’m using the “txrx_wbx_raw_eth_20100608.bin”
firmware, not the from-the-factory firmware. I made a simple flowgraph
which connects an FFT window to a USRP2 Source, tuned to 900 MHz at a
sample rate of 3.125 MHz (decimation factor 32). I input a 901 MHz sine
from an HP signal generator into the TX/RX connector on the WBX
daughterboard. When I run the flowgraph with the USRP2 Source set to
eth1 (for the first USRP2), it runs fine, and I see a nice clear tall
spike in the FFT at 1 MHz. However, when I set the USRP2 Source to eth2
(for the second USRP2) and re-run the flowgraph, I get a spike at 901
MHz that is barely noticeable and greatly attenuated. What’s going wrong
here? I used that second USRP2 a few weeks ago with a different
daughterboard and it ran fine, so I don’t think that USRP2 is bad.
Is there something wrong with the WBX daughterboard? Am I doing
something wrong in GRC? Any ideas?
Any help would be GREATLY appreciated.
Thanks a lot!!
Steve McMahon