Re: [Discuss-gnuradio] how to take input from multiple subdevices in the USRP simultaneously
On Sun, Mar 15, 2009 at 9:15 PM, Shabbir Ahmed shabbirahmed...@gmail.com wrote: 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 The RFX board only has one receiver on it, capable of using either of these connectors, but not both simultaneously. Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] how to take input from multiple subdevices in the USRP simultaneously
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 e...@comsec.com 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: shabbir.ah...@live.vu.edu.au
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[Discuss-gnuradio] how to take input from multiple subdevices in the USRP simultaneously
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.
Here goes the code that I could do so far.
##
#bring in blocks from the main gnu radio package
from gnuradio import gr
#bring in the USRP source/sink
from gnuradio import usrp
import sys
from gnuradio import audio
def build_graph():
#create the top block
tb=gr.top_block()
#creat the USRP source
tb.src_usrp=usrp.source_c(decim_rate=16)
#create a signal sink
tb.sink_file = gr.file_sink(gr.sizeof_gr_complex, 'test89.dat')
#create counter
tb.count=gr.head(gr.sizeof_gr_complex, int(2000))
#connect the source to the sink
tb.connect(tb.src_usrp,tb.count,tb.sink_file)
#choose the sub device
#subdev_spec = usrp.pick_rx_subdevice(tb.src_usrp)
subdev_spec = (0,0)
#subdev_spec = (1,0)
#Set the mux
tb.src_usrp.set_mux(usrp.determine_rx_mux_value(tb.src_usrp,
subdev_spec))
#get the sub-device
tb.subdev = usrp.selected_subdev(tb.src_usrp, subdev_spec)
#select receive antenna ('TX/RX' or 'RX2')
#tb.subdev.select_rx_antenna('TX/RX')
tb.subdev.select_rx_antenna('RX2')
#Set the gain
g=tb.subdev.gain_range()
gain=float(g[0]+g[1])/2
#gain=
tb.subdev.set_gain(gain)
#tune the center frequency
frequency=float(948e6)
tb.src_usrp.tune(0, tb.subdev, frequency)
return tb
if __name__ == '__main__':
tb = build_graph ()
tb.start ()
#
Thank you loads again.
Kind regards,
Shabbir Ahmed
PhD. Student
Victoria University, Melbourne, AUS
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http://www.nabble.com/how-to-take-input-from-multiple-subdevices-in-the-USRP-simultaneously-tp22479958p22479958.html
Sent from the GnuRadio mailing list archive at Nabble.com.
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Re: [Discuss-gnuradio] how to take input from multiple subdevices in the USRP simultaneously
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
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