Re: [Discuss-gnuradio] USRP2 timestamping issues

2008-09-21 Thread Matt Ettus
Per Zetterberg wrote: Hi All, Will there be any software in the USRP2 library that will enable you to receive a burst of samples starting at a certain time. At the moment one can start streaming and then process samples. A timestamp is obtained - which is great. But I would like to be able to sp

Re: [Discuss-gnuradio] Weird WX scope problem

2008-09-21 Thread Josh Blum
http://gnuradio.org/trac/changeset/9637 How's this? Stefan Bruens wrote: On Saturday 20 September 2008 23:22:20 Matt Ettus wrote: This is usually caused by your system not being able to keep up.Try lowering the fft_rate. The code from trunk does not use the fft_rate from the config file

Re: [Discuss-gnuradio] question about the receiver sensitivity

2008-09-21 Thread Matt Ettus
Bill Stevenson wrote: Hello, all I am using USRP1 board with RFX Transceivers and I want to know the receiver sensitivity of the daugterboards. For example, for BER less than 1e-5 and data rate 54Mbps, the 802.11a standard specifies the receiver sensitivity to be at least -65dbm. Once the rec

Re: [Discuss-gnuradio] Weird WX scope problem

2008-09-21 Thread Stefan Bruens
On Saturday 20 September 2008 23:22:20 Matt Ettus wrote: > This is usually caused by your system not being able to keep up.Try > lowering the fft_rate. The code from trunk does not use the fft_rate from the config file (opengl version of scope sink). Sent a patch to patch-gnuradio on thursda

[Discuss-gnuradio] Re: question about the receiver sensitivity

2008-09-21 Thread Richard C. Jaeger
Bill, I have a piece of the answer. I am using the BasicRX transformer coupled receiver boards. With the programmable gain amplifier ahead of the ADC set to a gain of 20 dB, I am measuring approximately -100 dBm sensitivity for a 10 dB S+N/N in a 100-Hz bandwidth. These numbers all need to be r

Re: [Discuss-gnuradio] Re: one question about gr_chunks_to_symbols_bc

2008-09-21 Thread jiangfan shi
Thanks very much, Eric. "...an STL vector of void *" gives me a very clear idea of the input_items. I will definitely look into the gnuradio code more broadly to understand it more deeply. Jiangfan On Sun, Sep 21, 2008 at 12:27 PM, Eric Blossom <[EMAIL PROTECTED]> wrote: > On Sun, Sep 21, 2008

Re: [Discuss-gnuradio] Re: one question about gr_chunks_to_symbols_bc

2008-09-21 Thread Eric Blossom
On Sun, Sep 21, 2008 at 11:56:08AM -0500, jiangfan shi wrote: > Thanks, Eric. > > >> > for (int m=0;m >> >const unsigned char *in = (unsigned char *) input_items[m]; > > Maybe I do not express my questions clearly. Basically I am asking > what the above code statement means. My understanding

Re: [Discuss-gnuradio] Re: one question about gr_chunks_to_symbols_bc

2008-09-21 Thread jiangfan shi
Thanks, Eric. >> > for (int m=0;m> >const unsigned char *in = (unsigned char *) input_items[m]; Maybe I do not express my questions clearly. Basically I am asking what the above code statement means. My understanding is that the input_items is a 2-dimension array. So after executing the abov