Re: [Discuss-gnuradio] USB latency problem

2009-09-20 Thread perz
> The best you can do with USB is 150-200us, if you use really small USB > transfers (~16bytes), and 250-400 if you use the default block size of 512 > bytes. I did the following experiment: I connected a square-wave to one of the J101 pins on the RFX1800 on two USRPs. Then the two PCs poll

Re: [Discuss-gnuradio] USRP2 dies

2009-09-20 Thread Matt Ettus
Chukhman, Ilya A. wrote: Hello, My USRP2 dies during transmission when using interpolation rates less than 24. When that happens, the USRP2 does not respond to any commands, including find_usrps, until it is rebooted. Looking at previous threads on this list, I noticed that other people expe

Re: [Discuss-gnuradio] still a newbe but learning

2009-09-20 Thread Josh Blum
You are probably missing a lot of software dependencies for gnuradio. From this page http://gnuradio.org/trac/wiki/UbuntuInstall find the "sudo apt-get -y install " command for 9.04 and run it. All the software dependencies will be installed. Then you can ./configure, make, and sudo make i

[Discuss-gnuradio] still a newbe but learning

2009-09-20 Thread Steve Mitan
Hi all (using Ubuntu 9.04) I am still having problems trying to get gnu radio and grc to run but I found what the problem is but can't figured out how to solve it. I tried to reinstall everything. When I "./configure" , I get the following message at the end. - "The follow

Re: [Discuss-gnuradio] USB latency problem

2009-09-20 Thread Stefan Bruens
On Sunday 20 September 2009 22:45:08 Newman, Timothy wrote: > It totally depends on where you implement the latency sensitive components. > I believe the best USB can do is a minimum of 100us, and that probably > the theoretical minimum. If you need 80-120 us latency, you will > definitely nee

RE: [Discuss-gnuradio] USB latency problem

2009-09-20 Thread Newman, Timothy
It totally depends on where you implement the latency sensitive components. I believe the best USB can do is a minimum of 100us, and that probably the theoretical minimum. If you need 80-120 us latency, you will definitely need to move the latency sensitive components to the FPGA. Here are a

[Discuss-gnuradio] USB latency problem

2009-09-20 Thread Rushikesh Khasgiwale
I tried to use the usrp for implementing rfid protocols, however the USB latency is causing a bottleneck and I cannot generate and send the reply packet before the timeout(I need to send the reply within 80-120 us). upon reading Thomas Schimd's paper(http://nesl.ee.ucla.edu/document/show/242), i

[Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 82, Issue 19

2009-09-20 Thread praphul chandra
Hi All, I am looking for making a SDR. The source is IF at 1.44 MHz & 10 MHz with 50 KHz BW. Can anyone suggest a suitable low cost AD card which can be used to sub sample the IF and further procees using GNU radio. Thanx in advance. -- Praphul ___ Dis