[Discuss-gnuradio] RFX900 and Clocking Notes

2008-01-31 Thread TomasOMaille
Hello, I am reading the Clocking Notes in order to set up a coherent 2 antenna system. My setup is a USRP Rev 4.5 and two RFX900 daughterboards dated 3-10-2006 Step1: I want to disable the RFX900 clocks so I need to Move R64 to R84, Move R142 to R153 which looks straight forward. Step 2:

Re: [Discuss-gnuradio] gnuradio C++ engineer wanted

2008-01-31 Thread Jeff Brower
Toby- I hope no one minds me putting this up here: I took a look at the Path Intelligence website. It's actually the case that you would track individuals to within a few meters using their cellphones without their knowledge? What about privacy concerns? It's one thing to be monitored by

[Discuss-gnuradio] Re: Combining gr.trellis and mod_pkt

2008-01-31 Thread Steven Clark
Pardon the bump. Maybe I should simplify the question: With the packet modulator, is it possible to run the packet payload bits through any kind of flow-graph/block during the rx_callback? On Jan 27, 2008 6:39 PM, Steven Clark [EMAIL PROTECTED] wrote: 'lo all. I would like to place code in

Re: [Discuss-gnuradio] Shielding on 2.4GHz

2008-01-31 Thread DiX
Martin Dvh wrote: It might pick it up on the 6V power cable. You could try putting ferrite beads around the power cable to reduce this. greetings, Martin Thanks for your suggestion. I removed a ferrite bead from my USB cable and put it on the power cable. Tested it again. The

Re: [Discuss-gnuradio] gnuradio C++ engineer wanted

2008-01-31 Thread Eric Blossom
On Thu, Jan 31, 2008 at 09:13:48AM -0600, Jeff Brower wrote: Toby- I hope no one minds me putting this up here: I took a look at the Path Intelligence website. It's actually the case that you would track individuals to within a few meters using their cellphones without their

Re: [Discuss-gnuradio] gnuradio C++ engineer wanted

2008-01-31 Thread Jeff Brower
Eric- On Thu, Jan 31, 2008 at 09:13:48AM -0600, Jeff Brower wrote: Toby- I hope no one minds me putting this up here: I took a look at the Path Intelligence website. It's actually the case that you would track individuals to within a few meters using their cellphones without

Re: [Discuss-gnuradio] Re: Combining gr.trellis and mod_pkt

2008-01-31 Thread Eric Blossom
On Thu, Jan 31, 2008 at 10:49:50AM -0500, Steven Clark wrote: Pardon the bump. Maybe I should simplify the question: With the packet modulator, is it possible to run the packet payload bits through any kind of flow-graph/block during the rx_callback? Yes. You could push the bits back into a

[Discuss-gnuradio] Problem setting transmit gain values....

2008-01-31 Thread Kshitij Kumar Singh
Hi, I tried out a simple script to get the gain range of the USRP (I had read in earlier mail archive that we were provided a single gain knob to tune over the entire range of 0 to 90 dB): - from gnuradio import gr, usrp u = usrp.sink_c(0) subdev =

[Discuss-gnuradio] Transmitting and Receiving Simple Sinosoidal singal over RFX2400 board

2008-01-31 Thread Patel, Tushar P
I am attempting to transmit a simple sinusoidal signal generated by GNU radio. The signal would be transmitted by RFX 2400 connected to one computer and the transmitted signal would be received by RFX2400 connected to another computer. Basically the signal would be sent wirelessly from one

Re: [Discuss-gnuradio] Problem setting transmit gain values....

2008-01-31 Thread Matt Ettus
Kshitij Kumar Singh wrote: Hi, I tried out a simple script to get the gain range of the USRP (I had read in earlier mail archive that we were provided a single gain knob to tune over the entire range of 0 to 90 dB): There is no gain control on transmit with the RFX boards. There is

Re: [Discuss-gnuradio] Transmitting and Receiving Simple Sinosoidal singal over RFX2400 board

2008-01-31 Thread Johnathan Corgan
On 1/31/08, Patel, Tushar P [EMAIL PROTECTED] wrote: The question that I have is that when I send the signal is there a default modulation taking place. If yes then what is it? If not then what options do I have for sending the signal and receiving the signal? Are you using the usrp_siggen.py

Re: [Discuss-gnuradio] Problem setting transmit gain values....

2008-01-31 Thread Kshitij Kumar Singh
On Thu, 2008-01-31 at 11:33 -0800, Matt Ettus wrote: Kshitij Kumar Singh wrote: Hi, I tried out a simple script to get the gain range of the USRP (I had read in earlier mail archive that we were provided a single gain knob to tune over the entire range of 0 to 90 dB):

[Discuss-gnuradio] help generating frequency offset

2008-01-31 Thread George Nychis
Hi all, I'm attempting to generate frequency offset in a script that is adding some channel features: http://cyprus.cmcl.cs.cmu.edu/matched_filter/gen_noise_samples.py The frequency offset is specified, for which the original signal is mixed and then the offset signal is added with the

Re: [Discuss-gnuradio] Interest in beamforming and GNSS receivers

2008-01-31 Thread Paul Creekmore
Carles Fernandez wrote: Hi everybody, I discovered GNU Radio few months ago, in a before-go-to-bed surfing. I found it very interesting, but complicated because of my poor skills in programming Python or C++. I'm doing research on Global Navigation Satellite Systems (GNSS) receivers, and I'm

Re: [Discuss-gnuradio] gnuradio C++ engineer wanted

2008-01-31 Thread Frank Brickle
On Jan 31, 2008 12:52 PM, Jeff Brower [EMAIL PROTECTED] wrote: Maybe you're right, it's inevitable. But I don't think it helps the cause of GNU radio at government agencies... I for one would be far more interested in using gnuradio to *spoof* the surveillance. That would really endear the

Re: [Discuss-gnuradio] help generating frequency offset

2008-01-31 Thread Matt Ettus
George Nychis wrote: Hi all, I'm attempting to generate frequency offset in a script that is adding some channel features: http://cyprus.cmcl.cs.cmu.edu/matched_filter/gen_noise_samples.py The frequency offset is specified, for which the original signal is mixed and then the offset signal

[Discuss-gnuradio] More Interest in Beam Forming/Adaptive Beam Forming

2008-01-31 Thread Richard Jaeger
I am also interested in beam forming from a different angle. I have a 4-element DX Engineering Phased array set up primarily for the 1.8 MHz and 3.5 MHz ham bands that I want to convert to a more flexible digitally controlled array using the USRP. Does anyone have any phased array software

Re: [Discuss-gnuradio] Interest in beamforming and GNSS receivers

2008-01-31 Thread Martin Dvh
Pavol Ďuriš wrote: Hi all, I have an interest in radioastronomy. I plan to make simple beamforming phase array (primary with 4 and later with 8 antennas) with USRP (later with 2) and GNU Radio. I am inspired by LOFAR radiotelescope. Now I collect all available information about using GNU

Re: [Discuss-gnuradio] Interest in beamforming and GNSS receivers

2008-01-31 Thread Carles Fernandez
Thank you very much for your informative responses. Now things are clearer to me: the possibility of building an antenna array combining two or more USRPs is just exciting! I'm also delighted with the option of using an external reference clock. I definitely will buy at least one USRP for the