> Hello all, > > I am trying to make the USRP1 work with 4 independent real signal > channels (not IQ) using two RX daughterboards. In the older versions > of GNURadio I was able to make this work with a custom block I had > found in a repository or from somebody on the mailing list. > > I am using GRC to make scripts and in the newer UHD version I'm having > trouble making this work with 4 channels. I can make 2 channels work > by setting the Mb0:subdev specification in the UHD block to A:A A:B, > or even A:B B:B, etc. > When I try to make all four work by setting A:A A:B B:A B:B (four > independent real channels) I get the following error: > > RuntimeError: ValueError: The subdevice specification "A:A A:B B:A > B:B" is too long. > The user specified 4 channels, but there are only 2 rx dsps on mboard 0. > > Does anyone know how I can properly call the subdevice specification > and make this work without needing a custom block (I'm not skilled > enough to write complicated blocks)? Again, in the older GNURadio > version I was able to get 4 real RX channels to work independently > with a custom block someone else had written. I don't think its > compatible with the newer UHD version as it was done in 2009. > > Thank you, - Tom > For 4 RX DSPs on the USRP1, you need the 4rx FPGA image:
http://files.ettus.com/uhd_docs/manual/html/usrp1.html#specify-a-non-standard-image -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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