Re: [Discuss-gnuradio] re: Low cost hardware option

On 01/13/2011 02:00 AM, Jamie Morken wrote: All "non-commercial use only" clauses most likely restrict most military use, and these are quite common, and are far more restrictive than a "non-military use only" clause. I do follow what you are saying though, but its a choice like "ethical inv

[Discuss-gnuradio] Building an RF Front end for DSP FPGA Kits with ADCs

Hello, I am looking to buy an Altera DSP FPGA Kit (DSP Development Kit, Stratix III Edition) for school research but I'm not sure how i am going to build an RF-Front End for it. I am looking to receive signals up to +30 dBm from 30 MHz - 2 GHz with bandwidths up to 50 MHz. This kit comes with

Re: [Discuss-gnuradio] re: Low cost hardware option

I like this discussion. Perhaps we could talk to the folks at http://www.oshwbank.org/ about helping sponsor the project (more details: http://antipastohw.blogspot.com/2009/03/introducing-open-source-hardware.html ) Another idea would be to do a Kickstarter campaign to raise some initial funds. A p

Re: [Discuss-gnuradio] Building an RF Front end for DSP FPGA Kits with ADCs

Why not just buy a USRP + WBX? 2011/1/13 sirjanselot > > Hello, > > I am looking to buy an Altera DSP FPGA Kit (DSP Development Kit, Stratix > III > Edition) for school research but I'm not sure how i am going to build an > RF-Front End for it. I am looking to receive signals up to +30 dBm from

Re: [Discuss-gnuradio] Finally compiled USRP2 code works fine with UDPimage ...but not with compiled Raw Ethernet Image

If you don't trust me, try it. Use Xilinx on Windows, create a project and put in all file of all different makefile in the repo for USRP2 with u2_rev3.v in top. Implement top module and create the bin file. After, give me some news plz. It's not loosing time, nobody had answer to my question an

Re: [Discuss-gnuradio] Building an RF Front end for DSP FPGA Kits with ADCs

I have one already, but you can't receive anything above - 10 dBm. Plus I'd like to gain FPGA programming experience. - Jan On Thu, Jan 13, 2011 at 10:33 AM, Euripedes Rocha Filho < rocha.euripe...@gmail.com> wrote: > Why not just buy a USRP + WBX? > > 2011/1/13 sirjanselot > >> >> Hello, >> >

Re: [Discuss-gnuradio] Building an RF Front end for DSP FPGA Kits with ADCs

On 01/13/2011 10:33 AM, Euripedes Rocha Filho wrote: > Why not just buy a USRP + WBX? > > 2011/1/13 sirjanselot > > > > Hello, > > I am looking to buy an Altera DSP FPGA Kit (DSP Development Kit, > Stratix III > Edition) for school research but I'm not

Re: [Discuss-gnuradio] Building an RF Front end for DSP FPGA Kits with ADCs

On 01/13/2011 11:23 AM, jan acosta wrote: > I have one already, but you can't receive anything above - 10 dBm. > Plus I'd like to gain FPGA programming experience. I'll observe that with a 30dB attenuator in front of your receiver, you can easily do what you want to do. I suspect that you don'

Re: [Discuss-gnuradio] Finally compiled USRP2 code works fine with UDPimage ...but not with compiled Raw Ethernet Image

> I tried it with cygwin but it didn't find ise_helper.tcl. I don't know > why, the file is at the good place. Do you have any idea of the > problem, I will ask somebody else at school. That tells me that xilinx ise "xtclsh" did not know what to do with that cygwin (unix) file path. That means

Re: [Discuss-gnuradio] About clock rate of USRP E100

On 01/11/2011 10:18 PM, Alexander Chemeris wrote: Hi Matt, Thank you for your clarification. What are the limits and steps/accuracy of ADC/DAC clock speed regulation? E.g. is it possible to sample at 56MHz or 26 MHz and set sampling clock with 1Hz precision? You cannot get 1 Hz steps. See ht

[Discuss-gnuradio] transient when changing valve state

I have a grc file that has a UHD source with output going to two places. 1) A scope graphical sink 2) A valve When I change the state of the valve, I see a glitch on the scope output. I would think that since the valve is not between the source and the scope that it would not affect the samples g

[Discuss-gnuradio] grc amplitude demodulation questions

Hello- I am using GRC 3.3 to create a flow graph using the USRP2 and a LFRX to do amplitude demodulation. I have a few questions. 1) What are good values for "Audio Pass" and "Audio Stop" within the "AM Demod" block? 2) I observe a DC offset at the output of the demodulation. Is this exp

Re: [Discuss-gnuradio] Building an RF Front end for DSP FPGA Kits with ADCs

Thanks Marcus. The reason why I do not want to attenuate is because I want to receive a high-powered signal and low-powered signal at the same frequency. If I attenuate then the low-powered signal will be reduced and if I go beyond the noise floor, I might see it. The goal was to stretch the

Re: [Discuss-gnuradio] grc amplitude demodulation questions

Hello- I am using GRC 3.3 to create a flow graph using the USRP2 and a LFRX to do amplitude demodulation. I have a few questions. 1) What are good values for "Audio Pass" and "Audio Stop" within the "AM Demod" block? 2) I observe a DC offset at the output of the demodulation. Is this expect

Re: [Discuss-gnuradio] Building an RF Front end for DSP FPGA Kits with ADCs

Thanks Marcus. The reason why I do not want to attenuate is because I want to receive a high-powered signal and low-powered signal at the same frequency. If I attenuate then the low-powered signal will be reduced and if I go beyond the noise floor, I might see it. The goal was to stretch the di

Re: [Discuss-gnuradio] OFDM Benchmark Change Modulation

On Tue, Jan 4, 2011 at 8:49 AM, You Lizhao wrote: > Hi all, > > Recently I want to implement a OFDM based multi-rate system, and I am using > benchmark_ofdm_tx/benchmark_ofdm_rx programs in ofdm directory. I know I can > use unlock/lock mechnism to disconenct/connect the exising blocks to change >

Re: [Discuss-gnuradio] DDC and Polyphase Channelizer

On Wed, Jan 5, 2011 at 4:14 AM, Jimmy Richardson wrote: > Hi, Tom: > > Please see my comments below. > > Thanks > > On 1/4/2011 11:44 PM, Tom Rondeau wrote: >> >> On Mon, Jan 3, 2011 at 11:25 PM, Jimmy Richardson >>  wrote: Indeed. Very strange. My guess is that there is a misconception

Re: [Discuss-gnuradio] Passing a message from one block to other

On Wed, Jan 12, 2011 at 2:43 PM, John Andrews wrote: > Hi, > Suppose I have two gnuradio blocks called gr_ACQUISITION and gr_TRACKING > where, gr_TRACKING is dependent upon some result derived from gr_ACQ block. > Is it possible to pass certain messages to gr_TRACK in order to change its > state w

Re: [Discuss-gnuradio] OFDM receiver on USRP2

On Wed, Jan 12, 2011 at 7:36 PM, Guanbo wrote: > > Hi, Tom > > I am not quite understand the ofdm_sync_xx.cc in python/gnuradio/blks2impl/. > > What is the difference between frequency synchronization and carrier > frequency offset. > Why we have to do the timing and frequency synchronization befo

Re: [Discuss-gnuradio] volk: duplicate symbol _volk_cpu

On Mon, Jan 10, 2011 at 11:04 PM, update lee wrote: >> when I try to build volk from next branch of git, I got error during make >> >> libtool: link: gcc -dynamiclib -Wl,-undefined -Wl,dynamic_lookup -o > .libs/libvolk_runtime.0.dylib  .libs/volk_cpu_x86.o .libs/cpuid_x86_64.o > .libs/volk_runtime

[Discuss-gnuradio] re: Low cost hardware option

FYI Have a look at the article[1,2] from James Ahlstrom N2ADR [3]. I think it could be an interessting approach/ point of start. [1] http://www.arrl.org/files/file/QEX_Next_Issue/Nov-Dec_2010/Ahlstrom%20NOV-DEC.pdf [2] http://james.ahlstrom.name/transceiver/index.html [3] http://james.ahlstrom.

[Discuss-gnuradio] LPDA orientation when receiving GPS signals on USRP2

Hi everyone, Does anyone know what the orientation of an LPDA (log periodic dipole antenna) should be when receiving GPS signals? Should the up-most element be the longest one, or should it be the shortest one? In other words ___

Re: [Discuss-gnuradio] LPDA orientation when receiving GPS signals on USRP2

On Thu, 2011-01-13 at 22:08 -0500, Nick Othieno wrote: > Hi everyone, > > Does anyone know what the orientation of an LPDA (log periodic dipole > antenna) should be when receiving GPS signals? > > Should the up-most element be the longest one, or should it be the > shortest one? In other words >

Re: [Discuss-gnuradio] LPDA orientation when receiving GPS signals on USRP2

On 01/13/2011 07:08 PM, Nick Othieno wrote: Hi everyone, Does anyone know what the orientation of an LPDA (log periodic dipole antenna) should be when receiving GPS signals? Should the up-most element be the longest one, or should it be the shortest one? In other words Point the short side (

[Discuss-gnuradio] uhd.tune_request_t & DBRSX[2]

I wonder if someone can help me? I have been trying to understand 'tuning' and I note that UHD has a couple of options for setting the centre frequency. The two methods: tune_request_t( target_freq ) method1 and tune_request_t( target freq, lo_off) when I try the former in GNURadio Com

Re: [Discuss-gnuradio] OFDM receiver on USRP2

Thanks Tom. I tried to see how much the carrier frequency offset would be. As you suggested above, I output the coarse freq offset bins, which was similar as Srinivas's result. It is constant "-2". Does it means the carrier offset can be computed as: ADC rate /( Decim_rate * FFT_len) * 2 ? If