[Discuss-gnuradio] USRP2-FLEX2400 Transmit and Receive problems

[Joseph Wamicha]

Hi,

We are currently experiencing Transmit and possibly Receive problems 
with the USRP2-Flex2400 boards.

- The USRP2 is detected:
# find_usrps -e eth0
00:50:c2:85:32:73 hw_rev = 0x0400

- The latest firmware and Raw Ethernet FPGA images have been written 
onto the SDRAM: u2_rev3-20100603.bin, u2_rev3-20100603.bin

- To test receive, we transmit a 2.4GHz, 10 dBm RF signal using the HP 
8350B Sweep Oscillator/Signal Generator. This is detected by both the 
USRP2-FLEX2400 (using usrp2_fft.py script) and Agilent Spectrum 
Analyzer. However, the usrp2_fft.py shows some odd sidebands around the 
the 2.4GHz central frequency when the signal generator is turned on. 
Also, there's barely any difference in dB receive strength with the 
signal generator turned on:
> usrp2_fft.py output when signal generator is off: 
http://rrsg.ee.uct.ac.za/members/jwamicha/usrp2_fft-SignalGenerator-Off.png
> usrp2_fft.py output when signal generator is off: 
http://rrsg.ee.uct.ac.za/members/jwamicha/usrp2_fft-SignalGenerator-On.png

- Both LEDs D and F are lit up.

- Gnuradio version 3.2.2 is being used on Ubuntu Lucid Lynx (10.04).

We then turn off the Signal Generator, and transmit a 2.4GHz signal 
solely using the USRP2-FLEX2400 by running 'usrp2_siggen.py -f 2.4e9 -e 
eth0'. Nothing gets picked up by the Agilent Spectrum Analyzer 
USRP2-FLEX2400.

Is there a USRP2-FLEX2400 transmit/receive problem while using the 
latest firmware and raw ethernet FPGA code? Could this be the symptoms 
of an SDRAM problem even if both LEDs D and F are lit up?

Thanks,
Jaw.