On 05/24/2011 01:26 AM, Eddie Sun wrote: > Hi list, > > I have a USRP N210, running on Ubuntu-10.04, when I try to use the > Gnuradio-Companion to make a fm_receiver, > > I success generate the python code, but when i try to run it, > > it shows > ----------------------------------------------------------------------------------- > terminate called after throwing an instance of 'std::invalid_argument' > what(): gr_buffer_add_reader: nzero_preload must be >= 0 > ----------------------------------------------------------------------------------- > what is that mean? Not sure, would have to see your GRC flow-graph.
> > > PS I would like to ask an additional question: If I only have DBSRX > RFX1200 RFX1800 these three daughterboards, is that means I can't > receive the 100MHz FM Radio Signal by my fm_receiver through the USRP > N210 (bandwidth not right)? or there is some other ways ? > > thanks, > The DBSRX covers about 800MHz to 2.3GHz, the RFX1200 covers 1.15GHz to 1.45GHz, the RFX1800 covers from 1.5GHz to 2.05GHz. I don't see 100MHz anywhere in there. If you want good coverage of the FM radio band (88MHz to 108MHz in North America), you would need a TV_RX2 card or WBX card. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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