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

From: George Nychis
Subject: Re: [Discuss-gnuradio] a little puzzled with setting rx mux...
Date: Thu, 21 Feb 2008 18:51:17 -0500
User-agent: Thunderbird (X11/20071022)

Hi Vincenzo,

I believe that this is because you are now attempting 16MHz total bandwidth, 8 from each channel. If you have a decimation rate of 8, you have 8Msps per second on one channel, and 8Msps on the other channel. The USB bus cannot handle this... it's not about your host computer.

- George

Vincenzo wrote:
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!

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...

I think I'm a bit confused about the meaning of instructions like


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?


do what I need?

really thanks

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