[Discuss-gnuradio] Tx path problems with RFX-900

Hello,everyone I have two problems about USRP Tx path as below: 1.General in the TX path,transmit data repeat again and again(I use RFX-900 daughterboard),but in my reseach I need to transmit data one period ,or after break some period,continue to transmit data.How do I do it? 2.I want know Tx

[Discuss-gnuradio] Re: question on using gr.file_source

Hello again! I still have the same problem. Unfortunately, I still can't make gr.vector_sink to work. I mean, how would it know that I just want to extract data from a particular source. Let's say I have these codes: yrx1_real = gr.file_source('arguments omitted') yrx1_imag = gr.file_source('argu

Re: [Discuss-gnuradio] Question: gr_float_to_complex

On Jan 21, 2008 10:07 PM, Jason Anders <[EMAIL PROTECTED]> wrote: > > Hi again! > > I have a question regarding the use of gr_float_to_complex block. > Unfortunately, Doxygen didn't show the implementation of such a block. What > I wanted to know is how gr_float_to_complex implements float to compl

[Discuss-gnuradio] Question: gr_float_to_complex

Hi again! I have a question regarding the use of gr_float_to_complex block. Unfortunately, Doxygen didn't show the implementation of such a block. What I wanted to know is how gr_float_to_complex implements float to complex conversion. I could only guess that it treats the first number as the rea

Re: [Discuss-gnuradio] Problems when receiving after transmit

On 1/20/08, Dan Halperin <[EMAIL PROTECTED]> wrote: > In the first set of data, the noise level is what I'd expect and > everything works hunky-dory. After the siggen, however, it all goes > haywire, the noise floor becomes huge even though an adjacent USRP sees > nothing. See >

Re: [Discuss-gnuradio] Problems when receiving after transmit

On 1/21/08, George Nychis <[EMAIL PROTECTED]> wrote: > > This should be a 3.3V logic level. Can you verify you have the right pin? > > I've drawn a red arrow to where I'm measuring from: > http://www.andrew.cmu.edu/user/gnychis/Flex2400.jpg This is the right pin. Are you using a high-impedance p

Re: [Discuss-gnuradio] Problems when receiving after transmit

Johnathan Corgan wrote: On 1/21/08, George Nychis <[EMAIL PROTECTED]> wrote: When running usrp_rx_cfile.py the first time, i get no voltage reading from this pin. Then I run usrp_siggen.py and get a little under 1V at the pin on average. When I stop usrp_siggen.py the pin goes down to about

Re: [Discuss-gnuradio] Problems when receiving after transmit

On 1/21/08, George Nychis <[EMAIL PROTECTED]> wrote: > When running usrp_rx_cfile.py the first time, i get no voltage reading > from this pin. > > Then I run usrp_siggen.py and get a little under 1V at the pin on average. > > When I stop usrp_siggen.py the pin goes down to about 200mV, which is >

Re: [Discuss-gnuradio] Help with DSP Cores for USRP2

On Jan 17, 2008 2:42 PM, Matt Ettus <[EMAIL PROTECTED]> wrote: > ... > 6 Testbenches for any of the above, even if you aren't designing the > filter core itself. I have put my attempt at a decent testbench here: http://lebowski.eatcheese.biz/~bpadalino/halfband/ There are some parameteriz

Re: [Discuss-gnuradio] Problems when receiving after transmit

Johnathan Corgan wrote: On 1/21/08, George Nychis <[EMAIL PROTECTED]> wrote: I have a logic analyzer and RFX2400 board handy that I can test this out. Which pin is the mixer chip enable pin? U101, pin 8. When running usrp_rx_cfile.py the first time, i get no voltage reading from this p

Re: [Discuss-gnuradio] Problems when receiving after transmit

On 1/21/08, George Nychis <[EMAIL PROTECTED]> wrote: > I have a logic analyzer and RFX2400 board handy that I can test this > out. Which pin is the mixer chip enable pin? U101, pin 8. -- Johnathan Corgan Corgan Enterprises LLC http://corganenterprises.com/ ___

Re: [Discuss-gnuradio] Problems when receiving after transmit

Dan Halperin wrote: You'd have to measure the logic level at the mixer chip enable pin to be sure. I have a logic analyzer and RFX2400 board handy that I can test this out. Which pin is the mixer chip enable pin? - George ___ Discuss-gnuradi

Re: [Discuss-gnuradio] Problems when receiving after transmit

On 1/21/08, Dan Halperin <[EMAIL PROTECTED]> wrote: > Interesting. I don't have a logic analyzer handy but after the holiday I > may find someone who knows how to use one. I can try to replicate it in my lab. > More importantly, do you have suspicions about the solution? ;) The daughterboard co

Re: [Discuss-gnuradio] Problems when receiving after transmit

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Interesting. I don't have a logic analyzer handy but after the holiday I may find someone who knows how to use one. More importantly, do you have suspicions about the solution? ;) As another data point, I've found that performing the second receive at

Re: [Discuss-gnuradio] Pentium IV computing power in FLOPS

On Mon, Jan 21, 2008 at 11:32:57AM +0100, Vincenzo Pellegrini wrote: > > just by the way.. on March 6th, the Soft-DVB work will be presented in > Karlsruhe at the WSR08 software defined radio conference. > > greetings > Vincenzo That's great. Please give us a report about the workshop when it

[Discuss-gnuradio] Re: Measure BER

irene159 schrieb am 2008-01-21 16:01: Hi! 2) When comparing data sent and data received, how can we detect bit lost in order to avoid clock shifting? In other words, if I’m sending “11010110” for example, and that the 4th bit is lost, a simple comparison will compare tx : “11010110” with rx : “

Re: [Discuss-gnuradio] Measure BER

Hi! I’ve started performing modulation and demodulation on the same machine but the main purpose is to make them work separately afterwards. I’ve seen some BER values on the forums and I was wondering if an “official” block had already been developed to measure it. 1) Tom, May I please have a

Re: [Discuss-gnuradio] Pentium IV computing power in FLOPS

Thanks Eric. very precious info.. just by the way.. on March 6th, the Soft-DVB work will be presented in Karlsruhe at the WSR08 software defined radio conference. greetings Vincenzo On Sun, 2008-01-20 at 20:19 -0800, Eric Blossom wrote: > On Mon, Jan 21, 2008 at 01:10:47AM +0100, Vincenzo

[Discuss-gnuradio] Question: Possible Problems with SWIG

Hi again! I'm trying to implement a signal processing block that makes use of classes that I personally defined. To be exact, I included a class that has the capability to perform Matrix and Complex Algebra (elem_matrix). The source codes compiled well (after following the howto example). Unfortu