Oh ok I will try that out not sure why I didn't come across that in my search.
Thanks so much Marcus!
-Tom
________________________________
From: Marcus D. Leech <[email protected]>
To: [email protected]
Sent: Tuesday, February 19, 2013 11:13 AM
Subject: Re: [Discuss-gnuradio] USRP1 4 Channel Subdev Issue
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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