I successfully? installed gnuradio 3.7.3 from source on Ubuntu 12.04 using the gnuradio-build script, but am running into problems demodulating anything from a R820T based SDR. GRC runs fine, but when I attempt to execute any blocks that include an AM, NFM, or WBFM demodulator I get a VOLK:Error allocating memory error. I also noticed that if I just pipe the RTL-SDR source to a GUI FFT Sink (either QT or WX) there are no axis labels on the graphs....
Attempting to receive WBFM using rtl_fm (per the examples on the rtl-sdr OsmoSDR website) produce only static. It's not a signal strength issue per se as another radio can pick up the station, and the SDR hardware is functional since I can receive WBFM with it normally via gqrx on a different machine . I'm wondering if there's a fundamental problem somewhere that's preventing demod from happening. Any troubleshooting suggestions would be appreciated. Regards, R
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