RE: [Discuss-gnuradio] a little puzzled with setting rx mux...

[Vincenzo]

really thanks George,

I figured it  out and it seems to work..
now I'm wondering why, if I enable two channels from the usrp with :

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


and attempt to transfer an 8 MHz bandwidth, the signals look and sound
good (once demodulated) but I keep getting "uOuOuOs.." which are not
there if the 2 channels are not enabled or the required bandidth is
below 8 MHz. 
(processing demand to the host computer is however far below the maximum
allowed by my machine)

thanks for help 
vincenzo

On Mon, 2008-02-18 at 10:34 -0500, George Nychis wrote:
> Hi Vincenzo, 
> 
> There is a method to the madness!
> http://gnuradio.org/doc/doxygen/classusrp__standard__rx.html#346488ad15ddefa75900e4d0a63574cc
> 
> Take a look at how each ddc is mapped.
> 
> - George
> 
> 
> -----Original Message-----
> From: Vincenzo <address@hidden>
> Sent: Monday, February 18, 2008 9:48 AM
> To: gnuradio mailing list <address@hidden>
> Subject: [Discuss-gnuradio] a little puzzled with setting rx mux...
> 
> Hi,
> I think I'm a bit confused about the meaning of instructions like
> 
> self.u.set_mux(gru.hexint(0x01010101))
> or
> self.u.set_mux(gru.hexint(0xf3f2f1f0))
> 
> I mean what exactly do I tell to the set_mux method by each single
> {0,1,2,3,or f}? 
> 
> does for exmample a 3 in the 4th position mean that adc3 is connected to
> the Q channel of DDC 1?
> 
> if so..
> how can I obtain two demultiplated gr.complex flows coming from two
> separate frontends (actually two DBSRX) one on rxA one and rxB side?
> 
> would 
> 
>         self.u.set_mux(gru.hexint(0x01230123))
>         self.connect(self.u,deinterleaver)
>         self.connect((deinterleaver,0),fft_sink1)
>         self.connect((deinterleaver,1),fft_sink2)
> 
> do what I need?
> 
> really thanks
> vincenzo
> 
> 
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
>