Hi Eric:
Thank you loads again for your recommendations. I did go through both the
files that you mentioned.
1. For the technique used in *"usrp_wfm_rcv2_nogui.py". *We can retrieve
two receive streams from a one daughter board, but this uses only one of the
antennas either the "TX/RX" or "RX2".
2. For what is done in *"multi_file.py"*. We get to retrieve 4 streams from
two daughter boards.
3. Now my question. Is it possible to receive two streams from a single
daughter board on a usrp, one from antenna "TX/RX" and the other from
antenna "RX2". ie.
input 1: subdev(0,0)---"TX/RX"
input 2: subdev(0,0)---"RX2"
Do I still have to load the "std_4rx_0tx.rbf"??
And use the same mux 0xf3f2f1f0??
Thank you loads in advance.
Shabbir
On Fri, Mar 13, 2009 at 4:08 AM, Eric Blossom <[email protected]> wrote:
> On Thu, Mar 12, 2009 at 09:40:29AM -0700, sHabzbd wrote:
> >
> > Hi Everyone:
> >
> > I am guessing that my last post was not clear since I didnt get any
> replies.
> > So here I go again.
> >
> > 1. I am using two Flex900 daughter cards on a single USRP.
> > 2. I am getting to select two subdevices (0,0) and (1,0) ie. daughter
> board
> > A or daughter board B
> > 3. On each subdevice I am getting to select two antennas 'TX/RX' and
> 'RX2'
> >
> > Now here is the thing. I can take anyone of the input at a single time,
> ie.
> > I can either get
> > a. subdevice(0,0) & antenna 'TX/RX'
> > b. subdevice(0,0) & antenna 'RX2'
> > c. subdevice(1,0) & antenna 'TX/RX'
> > d. subdevice(1,0) & antenna 'RX2'
> >
> > That is I am getting to set the usrp mux with
> > tb.src_usrp.set_mux(usrp.determine_rx_mux_value(tb.src_usrp,
> subdevice))
> > and then select and antenna for the subdevice
> > tb.subdev.select_rx_antenna('RX2')
> >
> > But I need to build a graph where I can take at least two of the above
> > mentioned inputs. And store them in two separate sinks if possible. Using
> > two different sink_files.
> >
> > Would really really appreciate any help or some direction or hint.
> >
> > Thank you loads in advance.
> >
>
> Hi Shabbir,
>
> I can point you to two different examples that between them do
> something similar to what you're trying to do.
>
> The first is gnuradio-examples/python/usrp_wfm_rcv2_nogui.py.
> This uses two DDCs to extract two streams from a single daughterboard.
> You can ignore the fact that the signal processing is an FM recvr.
>
> The second is gnuradio-examples/python/multi-antenna/multi_file.py.
> This one expects two Basic Rx daughterboards, and extracts a total of
> 4 streams, 2 from each daughterboard.
>
> In your case, since your extracting a single stream from each
> daughterboard, you'll want to use the tune method twice, once on each
> daughterboard. Your rx mux setting should be 0x32103210
>
> Eric
>
--
Shabbir Ahmed
PhD. Student
Centre for Telecommunications and Microelectronics
Victoria University
Email: [email protected]
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