[Discuss-gnuradio] Intel Stellarton Configurable Processor (for SDR?)
I don't know where I've been, but this is the first time I've seen anything about the announcement: http://www.slashgear.com/intel-stellarton-atom-e600fpga-promises-flexible-embedded-devices-14102251/ While the Atom processor is not very powerful, pairing it with a full fledged FPGA sounds promising for SDR that can work using fixed-point algorithms. Has anyone else heard about this processor? Is anyone else interested in it? I saw Altera is going to release Qsys which will support the processor/FPGA design flow: http://www.altera.com/b/embedded-fpga-design-flow.html?GSA_pos=1WT.oss_r=1WT.oss=qsys What are other people's thoughts? Brian ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] gnuradio.org seems to be down
gnuradio.org seems to be down Martin ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Intel Stellarton Configurable Processor (for SDR?)
On 10/28/2010 01:25 PM, Brian Padalino wrote: I don't know where I've been, but this is the first time I've seen anything about the announcement: http://www.slashgear.com/intel-stellarton-atom-e600fpga-promises-flexible-embedded-devices-14102251/ While the Atom processor is not very powerful, pairing it with a full fledged FPGA sounds promising for SDR that can work using fixed-point algorithms. Has anyone else heard about this processor? Is anyone else interested in it? I heard about it the other day from a friend involved in the video business. It is not clear from the press release if they expose IO's for connecting to data converters though. The combination is interesting for a number of applications, but for SDR you really want the data converters directly connected to the FPGA. Philip I saw Altera is going to release Qsys which will support the processor/FPGA design flow: http://www.altera.com/b/embedded-fpga-design-flow.html?GSA_pos=1WT.oss_r=1WT.oss=qsys What are other people's thoughts? Brian ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] How to hold a values from file source
On 10/27/10 1:23 PM, Marcus D. Leech wrote: Looking at the flow-graph, it seems like the modulation bits are running at the same rate as the carrier frequency, which won't work--not even slightly. Generally in AM/ASK, the modulation frequency is *much* lower than the carrier frequency, my gut is that you'd need at least several cycles of carrier between each bit. In addition, the two sample rates flowing into the multiplier are different. The 47 kHz carrier has a sample rate of 3Meg, while the digital data has a sample rate of 47K. You will need to upsample your data stream to the same sample rate as the carrier. Since there isn't an integer ratio between the two rates, you'll have to use the rational_resampler block. @(^.^)@ Ed ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Problem of using UHD blocks as Tx Rx
Dear Marcus Leech, Thanks very much for your response. I use RFX2400 daughterboards and their TX/RX ports. A attenuator is added between the transmitter and receiver boards now. And to simplify the test, I use a constant source at the transmitter side. Here is my GRC flow graph: http://old.nabble.com/file/p30077180/flow%2Bgraph.jpg And here are the results I've observed from the scope: http://old.nabble.com/file/p30077180/Result.jpg Why do I receive a sine wave when I transmit a constant? Best wishes, Hongliang Marcus D. Leech wrote: On 10/27/2010 02:11 PM, Hongliang Zhang wrote: Hi everyone, I made a test for UHD blocks today, and I found a problem as follows: I take two USRP2 boards for my test. One is used as transmiter and the other board is set to be receiver.And I use UHD Simple Sink and UHD Simple Source blocks for transmiting and receiving respectively. sampling frequency = 195.312K (which is the minimum sampling frequncy of the system). gain=0 The transmitted signal is a AM modulated sine signal. The frequency of orignal sine wave (the message signal) is 10K Hz. The frequency of carrier signal (center frequency for modulation at transmitter board) is 2.42 GHz, and I use the same frequency at the receiver board for demodulation. Amplitude of transmitted signal is 0.05. I connect the two boards together, and I add a scope to observe the period of the received demodulated signal. The problem is the period is about 0.45, which means the frequency of the signal I received is not 10 KHz, but about 2.2 KHz. I have used the same external reference clock and PPS signal for both of the boards, so I think they are set up correctly. Why do I get a received signal with different frequency from what I transmit? Does anyone meet the similar problem before? How may I solve the problem? Thanks so much for every help and suggestions in advance. Best regards, Hongliang What daughterboards are you using? Can you share your (GRC) flow-graphs with us--makes it easier to spot problems. I hope that you're using an attenuator between the transmitter side and receiver side. My guess is that there's a sample-rate issue somewhere on the receive side, like the scope sink hasn't been told the correct sample rate, so it's displaying incorrectly, etc. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://old.nabble.com/Problem-of-using-UHD-blocks-as-Tx---Rx-tp30069825p30077180.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] FM-Preemph block does nothing..
The FM-Demphasis block seems to work, but FM Preemphasis does nothing to the frequency response..looks broken to me.. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] (no subject)
It might be a $PYTHONPATH issue in that case... Have you set your PYTHONPATH environment variable to include the path to where your GNU Radio modules are installed? e.g. when I run env, the following line is included in the output (I'm using a Mac): PYTHONPATH=/usr/local/lib/python2.6/site-packages: 2010/10/27 ömer günay gunay_omer_7...@hotmail.com Thanks for your suggestion Kunal, but it didn't not work. I got an error -ModuleError: cannot import name my_block ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] FM-Preemph block does nothing..
On Thu, Oct 28, 2010 at 06:13:12PM +0200, Jasper Kanbier wrote: The FM-Demphasis block seems to work, but FM Preemphasis does nothing to the frequency response..looks broken to me.. OK. Please fix. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
RE: [Discuss-gnuradio] FM-Preemph block does nothing..
I will try as soon as I know the right transfer funtion of the filter. Gr Jasper -Oorspronkelijk bericht- Van: Eric Blossom [mailto:e...@comsec.com] Verzonden: donderdag 28 oktober 2010 21:50 Aan: Jasper Kanbier CC: Discuss-gnuradio@gnu.org Onderwerp: Re: [Discuss-gnuradio] FM-Preemph block does nothing.. On Thu, Oct 28, 2010 at 06:13:12PM +0200, Jasper Kanbier wrote: The FM-Demphasis block seems to work, but FM Preemphasis does nothing to the frequency response..looks broken to me.. OK. Please fix. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Leds on XCVR2450 transceiver
HI, I wonder if the red Leds of the XCVR2450 have any meaning. Many thanks, Jorge ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Problem in using trellis Error correction en- and decoder
Hello Achilleas Anastasopoulos Sorry for my delay. Well,I try to start the example (interference_cancellation.grc) but do not succeed. I put the trotle and then the warning disappears, but the error not. I installed the gnuradio by synaptic. in ubuntu, i think the Program Files directory is /usr/share/. Prefix = /usr/share/gnuradio/ Now it's works :) Well, Now we know that the example works (with a little modifications). I have fear of being wrong with regard to the functioning of the FSM. How we operate my trellis? I see that my file stop when i use files. why? (my file= http://img213.imageshack.us/img213/3435/pantallazoxe.png) I'm area of knowledge is not precisely electronics/telecommunications. i'm programmer, but i'm here. haha i read about TCM, and CC (the theory). Which finite state machine allows me to copy a file? where I can get such information? Thanks!! ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Problem of using UHD blocks as Tx Rx
Why do I receive a sine wave when I transmit a constant? Probably because the 100MHz reference clocks of your two USRP2s are slightly different Here are a few suggestions for being sure that you are locking to your 10MHz reference clock: If you have not modified the generated python code from your GRC flowgraph, then you are definitely not locked to refclock. The easiest way to fix this would be: Use a multi-usrp sink and source from the UHD categorey Set the number of motherboards and channels to 1 each Use the Sync to Unknow PPS option I know that is a strange interface, we will put an option to use external ref clock in an update coming soon to git repositories near you. Finally, be sure your refclock meets the power/amplitude requirements shown here: http://www.ettus.com/uhd_docs/manual/html/usrp2.html#ref-clock-10mhz +5dBm to +20dBm (roughly 1Vpp to 5Vpp) Jason ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] [SOLVED] Re: multi usrp, 1 odd channel, HW problem?
On Thu, Oct 14, 2010 at 12:13 PM, Steven Clark steven.p.cl...@gmail.comwrote: Hi all- I have a multi-usrp setup with 2 USRP 1s and 4 WBX daughtercards. I have performed the clock synching described here: http://gnuradio.org/redmine/wiki/1/MultiUsrp I'm doing 4-channel receive, using a power splitter to send the same CW signal into all 4 d'cards, and tuning them all identically. 3 of the 4 channels are nicely phase-locked. The 4th seems a little...off. ClockMasterUSRP (Serial #5821): Side A: red channel ClockMasterUSRP (Serial #5821): Side B: green channel ClockSlaveUSRP (Serial #2087): Side A: blue channel ClockSlaveUSRP (Serial #2087): Side B: black channel --- problem with this guy Please see these 3 images to see the problem: http://picasaweb.google.com/steven.p.clark/MultiUsrpGlitches?feat=directlink You can see the problem in both the frequency domain, and in the time domain. I tried swapping daughtercards around, and the problem is not tied to any one daughtercard, but rather to slave USRP side B. Any idea what could be causing this? Shouldn't the same clock be going to both sides of the USRP? (why does blue look fine, but black does not?) -Steven Solvedsee if you can spot the problem: self.usrp_master.tune(0, self.wbx0_subdev, freq) self.usrp_master.tune(1, self.wbx1_subdev, freq) self.usrp_slave.tune(0, self.wbx2_subdev, freq) self.usrp_slave.tune(0, self.wbx3_subdev, freq) /facepalm (The final line's 0 should be a 1. the daughtercards were getting tuned properly, but the 4th DDC was not). Everything looks fine now. Sorry for suspecting the hardware, Matt! -Steven ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] gnuradio.org seems to be down
*bump* On 10/28/2010 06:32 AM, Martin DvH wrote: gnuradio.org seems to be down Martin ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] OS X 10.6, x86-64 built from GIT fails at 'make check'
The issue is in gnuradio-core/src/filter/qa_gri_fir_filter_with_buffer_ccc.cc. The ERR_DELTA is set to 1e-5, which for some reason is too tight for OSX (at least 10.6.4 x86_64); when I change this value to 1e-4, the test passes. Since gnuradio.org is down, I can't check to see if this value or file was changed recently. - MLD ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] gnuradio.org seems to be down
The site is back up. Tom On Thu, Oct 28, 2010 at 9:24 PM, Josh Blum j...@joshknows.com wrote: *bump* On 10/28/2010 06:32 AM, Martin DvH wrote: gnuradio.org seems to be down Martin ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Does GNUradio have an envelope detector block?
Now I'm trying to build an ASK demodulator. I use GRC. However, I REALLY REALLY couldn't find an envelope detector. Does GNUradio have an envelope detector block? Or, do I have to make that one? ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Does GNUradio have an envelope detector block?
On 10/28/2010 10:50 PM, songsong gee wrote: Now I'm trying to build an ASK demodulator. I use GRC. However, I REALLY REALLY couldn't find an envelope detector. Does GNUradio have an envelope detector block? Or, do I have to make that one? The RMS block will basically do what you want, you can play with the alpha parameter to give you control over the low-pass corner frequency of the envelope detection. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Problem of using UHD blocks as Tx Rx
I know that is a strange interface, we will put an option to use external ref clock in an update coming soon to git repositories near you. OK, i pushed that change. Update your uhd and gr-uhd. Also, front panel led E is an indicator of external ref lock: http://www.ettus.com/uhd_docs/manual/html/usrp2.html#front-panel-leds -Josh ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Leds on XCVR2450 transceiver
Power Jorge Miguel jmig...@gmail.com wrote: HI, I wonder if the red Leds of the XCVR2450 have any meaning. Many thanks, Jorge ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Someone please check my ASK de/modulator.
I've just made AKS modulator and demodulator Currently, however, I couldn't use USRP. So I cannot make sure that it really works And also, I'm new to GNUradio and USRP! These are flow graphs made by GRC, and some test input file sources. (with lots of 0x00's and 0xFF's) http://goo.gl/sx5m (a tar.gz file) Please test my program and give me helpful and useful advices. :) ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
