Re: [Discuss-gnuradio] Bypassing daughtercards

[Brian Padalino]

On 2/15/07, address@hidden <address@hidden> wrote:
> I am currently working with GNU radio and USRP board with its transceiver 
> daughtercards for transmitting and receiving signals.  I have recently aqcuired 
> new RF front end hardware that can mix a baseband signal up to 3.4 GHz and 
> transmit it.  The interface to the new RF hardware is thru BNC cables.  I want 
> to know if there is a way that I can do all the processing in GNU radio, send 
> the data through the usrp board to and the transmit DAC's, and then send the I 
> and Q channels from the DAC to the new RF front end hardware.  For example, are 
> there pins on the USRP board (or daughtercards) that I can pull the I/Q data 
> off of to send to the new hardware?
>
> Thanks
> Nick

You can pick up the baseband differential analog signals of I/Q from
the daugherboard header.  I believe the dboard.sch in the usrp-hw
module under SVN would be helpful.

http://gnuradio.org/trac/browser/usrp-hw/trunk/usrp

Brian