Re: [Discuss-gnuradio] FW: FRS questions

[Eric Blossom]

On Wed, Nov 15, 2006 at 09:47:19PM -0500, MAB wrote:
> Hi!
> 
> Several questions:
> 
> I'm new in gnu radio and am trying to implement a prototype of new radio
> based on USRP platform. We're receiving several waveforms in different
> frequency bands and we want to incorporate a special functionality, just as
> a demo: The idea is receiving broadcast AM band and retransmit in FRS band
> (FM narrow band in 450 MHz approximately).
> 
> Regarding this issue, we have the following questions:
> 
> 1)       How can we control side A and side B on the same motherboard in
> order to receive in side A and retransmit in side B?
> 
> 2)       How can we configure FRS functionality in the motherboard and in
> the TxRx 400 card? Which registers and how should be modified?
> 
> Thanks in advance
> 
> MAB

If you look at pretty much any example in
gnuradio-examples/python/usrp you'll see how to control a particular
daughterboard.   Or look at gnuradio-examples/python/digital.  Those
are doing something different WRT modulation, but they can and do open
up different daugtherboards for Rx and Tx.

In your case with the Tx on one side and the Rx on the other, there's
no particular problem.  That's one rx chain and one tx chain.  Look at
how the examples handle the rx and tx subdev command line
specification (the -T and -R command line options).

Eric