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

From: Joseph Wamicha
Subject: [Discuss-gnuradio] USRP2-FLEX2400 Transmit and Receive problems
Date: Tue, 31 Aug 2010 17:58:43 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100713 Thunderbird/3.0.6


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?


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