[Discuss-gnuradio] subdevice selection in USRP2

[ematlis]

Hi all-

as part of my on-going efforts to acquire 2 channels (two independent 
signals) on my USRP2 with an LFRX board, I would like to know if there is 
an equivalent to the subdevice setup code that exists for the USRP1.  For 
example:

        if not self.u.set_nchannels(nchan):
            sys.stderr.write('set_nchannels(%d) failed\n' % (nchan,))
            raise SystemExit

        self.subdev = self.u.db[0] + self.u.db[1]

        self.u.set_mux(gru.hexint(0xf0f0f1f0))

I already understand from a previous response on this list that there is 
only a single DDC in the USRP2 fpga image, and I can at least verify that 
set_nchannels, db, or set_mux is not defined for the USRP2.  Are there 
equivalents with different syntax for the USPR2?  Without them or their 
equivalents, is it even possible to acquire two channels with the USRP2 
currently?

My thought was I could get arround the existence of only 1 DDC by tuning 
to the midpoint of my two signals and shifting them independently to 
baseband in the host pc, but it seems to me I need more than this to 
properly setup the two signal paths.

thanks,
eric