Re: [Discuss-gnuradio] RX and TX with single USRP

2007-12-27 Thread wolfgang buesser
Johnathan Corgan-2 wrote: > > Wolfgang Buesser wrote: > >> Any suggestions for a straightforward approach would be more than >> welcome. > > The pattern to use (in pseudo code) is: > > class receive_path(gr.hier_block2), with no inputs or outputs > (instantiate and self.connect your receive

[Discuss-gnuradio] TX/RX Coordination

2007-12-27 Thread Robert Miller
Hello, I am having some trouble trying to setup the following experiment. I have a single USRP and 2 RFX-1800 daughterboards and wish to transmit and receive between them using only the TX/RX ports. Since I would like to use the same frequency, f1, I would like to time-division multiplex the da

Re: [Discuss-gnuradio] RX and TX with single USRP

2007-12-27 Thread Johnathan Corgan
Wolfgang Buesser wrote: > Any suggestions for a straightforward approach would be more than > welcome. The pattern to use (in pseudo code) is: class receive_path(gr.hier_block2), with no inputs or outputs (instantiate and self.connect your receive chain here) class transmit_path(gr.hier_block2)

[Discuss-gnuradio] corrupt points follow up

2007-12-27 Thread ematlis
It just occurred to me that perhaps the explanation for the "corrupt" points I described in my AM demodulation script is due to the mechanics of how the Hilbert Transform works; it produces a copy of the waveform that's delayed, and this would affect the first set of points. Can anybody expand

[Discuss-gnuradio] flow_graph.stop() hangs

2007-12-27 Thread Justin Shaw
flow_graph.stop() seems to hang on me. This doesn't occur when I use grc, which means I most have a problem with my code. The last line of the following code is where the problem is. Any ideas appreciated! Justin def write(t, filename): ''' generate and signal, transmit using usrp, then

[Discuss-gnuradio] corrupted points when writing to file

2007-12-27 Thread ematlis
Hi- I have a python app which seems to corrupt points when I use it to demodulate a data stream stored in a file and write the de-modulated result back to a file. I've attached the python code, and an image of the problem can be seen at www.nd.edu/~ematlis/z.gnuradio/waveform.jpg The modul

[Discuss-gnuradio] RX and TX with single USRP

2007-12-27 Thread Wolfgang Buesser
I want to build a network analyzer using the usrp with LF-RX/TX. I am new to gnu-radio and usrp and so far only managed to send an receive based on the examples usrp_rx_cfile.py and usrp_siggen.py. I think I pretty much understand the code. It seems I cannot have two derivatives of gr.top_block

Re: [Discuss-gnuradio] USRP Dynamic Range and 8 Bit Problem

2007-12-27 Thread Firas A.
Hi, > I believe that Matt was referring to using max-strength I & Q inputs > to the Basic Rx along with an Rx mux setting that routes both ADC > outputs into the same DDC. (The default config with the Basic Rx > feeds a constant zero into the Q DDC input). > > Eric I believe Matt was right ab