Re: [Discuss-gnuradio] PCI Express SDR Cards and GNU Radio
On Wed. Jul 4, 2012 Tom Rondeau wrote I only know of the Per Vices product but have not gotten my hands on it. But I'm really happy that they have produced their own GNU Radio interface for it already. My biggest question is if it's well-shielded enough for the noisy RF environment inside a computer chassis. Tom HA HA HA - this article came out the following day. It has a photo of *both* the Per Vices card *and* the person who wrote the above comment ! http://arstechnica.com/tech-policy/2012/07/how-software-defined-radio-could-revolutionize-wireless/2/ Best Regards Max ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] PCI Express SDR Cards and GNU Radio
It has a photo of *both* Well, two separate photos, if one wanted to be technical ;-) Max___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Transmission time control from python level
I have three USRP's and I want them to transmit a continuous stream of repeated GLFSR source in non-overlapping manner. In other words, each transmitter will transmit the source for 1 second and then pause for 5 seconds. All transmitters will transmit during the 'odd' seconds so that there is a 1 second gap between the sources. This process should continue for ever. Currently, I am controlling the starting and stopping time of the flow graphs to achieve my goals. Unfortunately, the code/flowgraph sometimes hangs after 15-20 starts. I am using the following code: tb = GLFSR_transmitter() # The Tx flowgraph : GLFSR source (float) -- RRC filter -- USRP Sink var = 1 while var == 1: # This process should run forever time.sleep(1-time.time() + int(time.time())) condition = ((int(time.time())%6) == 0) # The transmitter will transmit after every 6 seconds if (condition): print time.time() tb.start() sleep(1) # The transmitter runs for 1 second tb.stop() tb.wait() My USRP's don't seem to like this frequent starting and stopping of flow graphs, especially when I am transmitting at 15-20 MS/s rate. I am using USRP N210 (SBX daughterboards) and the latest gnuradio images. What other things can I do to achieve this timing control? I am looking for options in python level since my C++ OOP background is not strong. Josh talked about some python based blocks ( ttps://github.com/guruofquality/gnuradio/tree/python_blocks2https://github.com/guruofquality/gnuradio/tree/python_blocks2) in (http://old.nabble.com/How-to-implement-a-TDMA-system-td33727749.html). They seem to be merged to the master ( http://gnuradio.org/redmine/projects/gnuradio/repository/revisions/f8581fb475267e1a97eaab962e423559fb4bfce2) but I can't find the blocks. Any suggestion will be appreciated. Thanks, Nazmul -- Muhammad Nazmul Islam Graduate Student Electrical Computer Engineering Wireless Information Networking Laboratory Rutgers, USA. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] PCI Express SDR Cards and GNU Radio
Great work! Connecting any RX/TX to the computer PCI smells problems... I wouldn't cosider this option, Patrik - Original Message - From: ikjtel To: discuss-gnuradio@gnu.org Sent: Saturday, July 07, 2012 16:12 Subject: Re: [Discuss-gnuradio] PCI Express SDR Cards and GNU Radio On Wed. Jul 4, 2012 Tom Rondeau wrote I only know of the Per Vices product but have not gotten my hands on it. But I'm really happy that they have produced their own GNU Radio interface for it already. My biggest question is if it's well-shielded enough for the noisy RF environment inside a computer chassis. Tom HA HA HA - this article came out the following day. It has a photo of *both* the Per Vices card *and* the person who wrote the above comment ! http://arstechnica.com/tech-policy/2012/07/how-software-defined-radio-could-revolutionize-wireless/2/ Best Regards Max -- ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
