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From: | Anisha Gorur |
Subject: | Re: [Discuss-gnuradio] Can another DUC chain be added to USRP N210? |
Date: | Sat, 29 Sep 2012 12:45:37 -0400 |
I think adding two complete DUC chains into N210 would be too
On 09/28/2012 08:49 AM, Anisha Gorur wrote:
> Hello All,
>
> I am using a USRP N210. When i set the subdev spec for my basic RX
> daughterboard as "A:A A:B" I can receive two channels. However, if I try to
> do something similar for the basic TX I get an error like "The user
> specified 2 channels, but there are only 1 tx dsps on mboard 0." I assume
> this is because there is only one DUC chain in the N210. Is there a way to
> modify this so that I can have two DUC chains in the same way that I have
> two DDC chains?
> Thanks,
> Anisha
complicated to be worth it.
Is there something specific that you cant do with the single DUC chain?
As long as the cordic is set to zero, I and Q will remain completely
separate from host samples, all the way to the SMA connectors A and B.
Otherwise, perhaps you need a different rotation for I vs Q? I think
that would be better accomplished by two different cordics. Then perhaps
a custom DSP in the FPGA is for you:
http://code.ettus.com/redmine/ettus/projects/uhd/repository/revisions/master/entry/fpga/README.txt#L29
I hope that helps.
-josh
>
>
>
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