[Discuss-gnuradio] USRP2 Ethernet port does not work

I've been using many USRP2s for my project. Today one of the USRP2s cannot be recognized through Ethernet. Only the green LED on the Ethernet port lights up. I hooked up the Serial debug port and it says, ethernet flow control: SYMMETRIC LANSR: LINK_GOOD ethernet flow control: SYMMETRIC

[Discuss-gnuradio] USRP2 + UHD MIMO implementation

Hi all, I'm working on implementation of MIMO system based on USRP2+UHD. I used MIMO method #3, which uses 10Mhz and 1PPS external reference clock. Also multiple USRP2s are connected to one PC though multiple Gbit Ethernet connections. I used multiple uhd_single_usrp_source and uhd_single_usrp_

[Discuss-gnuradio] How to use UHD with gr_block?

Hi all, I've used USRP1 and GR 3.1.3 since 2007. Now I try to move to USRP2 and GR 3.3 version. The most important reason is that I hope to have more bandwidth and to access timestamp information of sampled data. The thing is that GR and USRP2 architecture looks evolved so much since two years a

Re: [Discuss-gnuradio] Noise floor and Rx Gain

ng to the 'rx_gain' value? Thanks in advance again. Matt Ettus wrote: > > On 01/23/2010 09:48 AM, Yong J. Chang wrote: >> >> All, >> >> I'm trying to set all USRP and RFX2400 parameters comparable with Micaz >> in >> the context of receiver

[Discuss-gnuradio] Noise floor and Rx Gain

All, I'm trying to set all USRP and RFX2400 parameters comparable with Micaz in the context of receiver sensitivity. But I've observed a non-linear behavior of ADC. By using usrp_fft.py, we can see noise floor level. When I change a rx-gain in a range of 0~45dB, noise floor level does not change

[Discuss-gnuradio] Two different D'board on one USRP

Hi folks! I have a question about setting up USRP. Is it possible to for two RF front ends (one at 900 MHz and one at 2.4GHz, for example) to be connected to one USRP? Thanks in advance! -- View this message in context: http://www.nabble.com/Two-different-D%27board-on-one-USRP-tp24291659p24291

[Discuss-gnuradio] Time difference of two receivers

Hi all, Now I'm having interesting observation. I have three USRP and RFX2400 and I'm testing broadcast ( 1 transmitter and 2 receivers). I hooked the oscilloscope probes up right after AD8347-out (pin 4,3) in RFX2400 board. Although the two receivers are located very closely, there is a relati

Re: [Discuss-gnuradio] Segmentation fault : Try to make dual channel building blocks

Thank you Eric, But I still have a problem. I simply made two blocks. 1) First One gr_data_parser::gr_data_parser () : gr_block ("gr_data_parser", gr_make_io_signature (1, 1, sizeof (gr_complex)), gr_make_io_signature (1, 2, sizeof (gr_complex))) 2) Seco

[Discuss-gnuradio] Segmentation fault : Try to make dual channel building blocks

Hi all, Now I'm building some signaling blocks having dual output streams. But if I try to make dual output streams which have different data type from input stream, 'Segmentation fault' error is occurred. How can I make dual outputs which have different data type from input stream? Thanks in ad

[Discuss-gnuradio] The effect of FUSB_BLOCK_SIZE and FUSB_NBLOCKS

Hi all, Now I'm working on measuring Round Trip Time ( FPGA(RXFIFO)->USB->PC->USB->FPGA(TXFIFO) ). Since I'm using 128kbps bitrate and 10 samples per symbol, sample rate is 1.28Msps. And I do not give any options about FUSB_BLOCK_SIZE and FUSB_NBLOCKS. So they might be 0. In this case, the resu

[Discuss-gnuradio] Full duplex on USB connections?

Hi all, Since I'm not familiar with USB architecture, it might seem like stupid question. Now I'm receiving some data(called RxData) from USRP and obviously USRP is set as a receiver mode. At the same time, I have a data to be transmitted(called TxData) which is not related with received data. Th

[Discuss-gnuradio] Example of Inband signaling

Hi all, I'm studying on GNURadio and USRP with RFX2400. So far I was successfully able to make new signal blocks (e.g noncoherent FSK demodulator) with using benchmark_rx.py and benchmark_tx.py and it works fine. Now I'm interested in inband signaling. I want to know exact time of arrival of rec

[Discuss-gnuradio] Importerror _gnuradio_swig_py_runtime on Cygwin

Thanks Don for previous question! I successfully configured and compiled GNURadio trunk on Cygwin and tried to run example. But I'm getting following error: Traceback (most recent call last): File "./benchmark_tx.py", line 23, in from gnuradio import gr, gru, modulation_utils File "/us

[Discuss-gnuradio] GSL function error on Cygwin

Hi all, I'm trying to use GNU radio on Cygwin environment. It has taken couple of days to compile depedent stuffs. I'm on my almost final stage. I have following error messages when I compile 'gnuradio-core'. *** Warning: This system can not link to static lib archive /usr/local/lib/libgsl.la. *

[Discuss-gnuradio] DC offset problem on OOK modulation

Hi all, Now I'm working on OOK modulation/demodulation with RFX2400 d'board. I modified dbpsk.py and psk.py in order to get [1+0*j , 0+0*j] baseband signal and verified this signal is sending to USRP board. Since I'm using tx amplitude=14000, the range is [+14000,0] in real axis. But, I read th

[Discuss-gnuradio] Intermediate Frequency of RFX2400

Hi all, Now I'm confusing intermediate frequency of RFX2400. I cannot find any references about that. As I know so far, RFX2400 converts carrier frequency(we selected it on python script) band freq to 10Mhz intermediate freq. This 10Mhz signal is passed to FPGA. Therefore, DDC frequency is fixed

Re: [Discuss-gnuradio] RFX2400 Transmit power

Thanks all! As I know so far, RFX2400 doesn't have amplifier we can control. So set_gain() doesn't affect any transmit power. Right? Now I'm trying to control PGA gain on FPGA side, but I confused. AD9862 has pga which can be controled in range [0 ~ -20dB]. self.u.set_pga(0,-20) pga_gain = self

[Discuss-gnuradio] RFX2400 Transmit power

Hi, all! Now I'm using USRP1 and RFX2400 d'board. In our project, we have to be able to reduce transmit power down to -40dBm. Please correct me if my approach is wrong. If we set tx_pga=0dB, the transmit power only depends on the level of signal. So, +/-32767 can give us maximum transmit power 1