Re: [Discuss-gnuradio] u2_flash_tool : Can not find the command
Hi, Johnathan, John, Matt and Josh Thank you all for the help! The problem was solved!:) When I am using the SD card via a USB adapter, it shows the name dev/sd1. By using this name, it gives me the same results as before. However, the USRP works well by using the name mmcblk0 . :) Another thing is that actually the terminal shows the name mmcblk1 when I inserted SD cards as soon as I took them from the package without any extra operation for partition. regards, Andy -- View this message in context: http://old.nabble.com/u2_flash_tool-%3A---Can-not-find-the-command-tp27760919p27791386.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] benchmark_rx.py with std_4rx_0tx.rbf
The script benchmark_rx.py (located in gnuradio-examples/python/digital) doesn't run with the FPGA-file std_4rx_0tx.rbf. Is there any explanation for this problem? On the TX-side, I'm running benchmark_tx.py with the standard rbf-file std_2rxhb_2tx.rbf. (Testing benchmark_rx.py with the standard rbf-file on the RX-side works properly.) My setup (both RX and TX): GNU Radio (commit hash 3.3git-647-geb6ff48d, fetched 03.04.2010) running on Ubuntu 8.10 USRP1 (RFX2400 daughterboard, omnidirectional antenna) ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Transmit legit, become a ham
Nothing forces you to interact with other ham radio operators. You can happily work in isolation communicating among your own stations if you wish. Unless you need to do frequency coordination, which you usually do. Then you have to deal with the oldest, gnarliest hams around, the ones who 50 years ago got access to mountaintop towers and have been squatting on them ever since, like trolls under bridges. However, ham-land contains a ready pool of technically inclined people, most of whom are interested in but not well informed about subjects like software defined radio and Free Software. I got a ham Tech license in the 1970-80's and it was one of the more disappointing experiences in my life. What a culture clash! The ham fraternity was filled with people who spent all their time chit-chatting on their handheld radios about their personal lives, but who knew and cared very little about radio technology or computers. (Nowadays everyone has cellphones, but in those days they were the only ones who could communicate mobile.) They fought uselessly over stupid little status things like how short or long your callsign was. I soldered together a 1200 bps packet radio interface board, ran BBS's, evolved protocol software, and taught classes on digital radio communication protocols to the interested part of the local Bay Area ham community (led by Hank Magnuski, KA6M). The almost universal attitude among the hams who I met was We got here first, we own these frequencies, don't you put any funny computer stuff on 'em because that will just attract more of the public to horn in on our monopoly. They actively threatened to turn me in to the FCC for any real or imagined violation of the incredibly picky rules, like letting someone else log in over my radio modem (carrying third party traffic). Really friendly folks. I decided to retire my ham license until a large number of the existing hams died off (many were middle aged or older). Perhaps now the worst jerks have cleared the ranks, and some more welcoming people are hams; I don't know. I moved my digital radio experiments to the unlicensed bands, ignored the hams, and have been much happier ever since. I think the hams are still doing 1200 bps FSK, while the unlicensed folks have evolved to 108,000,000 bps WiFi. There must be tens of thousands of hams nationwide. There are tens of thousands of WiFi nodes in San Francisco alone -- and no crazy restrictions about not using encryption, not letting other people use your radio, etc. John ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] benchmark_rx.py with std_4rx_0tx.rbf
On Fri, Mar 05, 2010 at 11:27:00AM +0100, Christian Rohlfing wrote: The script benchmark_rx.py (located in gnuradio-examples/python/digital) doesn't run with the FPGA-file std_4rx_0tx.rbf. Is there any explanation for this problem? On the TX-side, I'm running benchmark_tx.py with the standard rbf-file std_2rxhb_2tx.rbf. (Testing benchmark_rx.py with the standard rbf-file on the RX-side works properly.) My setup (both RX and TX): GNU Radio (commit hash 3.3git-647-geb6ff48d, fetched 03.04.2010) running on Ubuntu 8.10 USRP1 (RFX2400 daughterboard, omnidirectional antenna) Just to rule out a problem, are you trying to run both Tx and Rx concurrently using a single USRP1 connected to a single computer? If so, you need to specify the same .rbf file for both the Tx and Rx sides, otherwise the last one opened stomps on the first one opened when it reloads the FPGA with the other .rbf image. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Quadrature direct-conversion receiver design
On 03/04/2010 06:24 PM, Marcus D. Leech wrote: OK, so this probably seems like a fundamental sort of question, but I've noticed that there seem to be a couple of different places on the net describing quadrature receiver toplogies, and I want to know something fairly simple. For a direct-conversion quadrature receiver, must you phase split *BOTH* the RF and LO inputs to the mixers? That is, do you need a 90 degree hybrid on both the RF and LO ports? The way I think of it is that you need quadrature on 2 of the 3 ports -- The way we use this on USRPs is that the RF is split but not phase shifted, the LO is phase shifted, and you get the 2nd phase shift by using I and Q samples. In what amateurs call phasing receivers, instead of using I and Q sampling, you phase shift one channel using analog components and then add that to the other channel. In both cases you could do the phase shift on the RF instead of the LO, but that is usually harder to do cleanly. Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Quadrature direct-conversion receiver design
F.Y.I. http://www.norcalqrp.org/files/Tayloe_mixer_x3a.pdf original Tayloe pdf about QSD Ken N9VV On 3/5/2010 6:08 AM, Matt Ettus wrote: For a direct-conversion quadrature receiver, must you phase split *BOTH* the RF and LO inputs to the mixers? That is, do you need a 90 degree hybrid on both the RF and LO ports? ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Building GNU Radio on the Beagle board
Hi; My project changed but at the end *I get the image* , problem is my University's firewall they are allowing only a few ports because of that I download from another location. Thanks On Tue, Feb 16, 2010 at 7:36 PM, Philip Balister phi...@balister.orgwrote: On 02/16/2010 07:15 AM, George Nychis wrote: I believe you're failing the human checker ;) Philip is trying to tell you to e-mail him for the files. He did email. Maybe I have him a bad link. Since I am traveling atm, here is the link: http://balister.dyndns.org:8008/~balister/gnuradio-image.tar.gzhttp://balister.dyndns.org:8008/%7Ebalister/gnuradio-image.tar.gz If your firewall is restrictive, the port may be the problem. Let me know, and I can move it to my website for a bit. Philip - George On Tue, Feb 16, 2010 at 1:27 AM, halidziya yerebakanhalidz...@gmail.com wrote: Hi; Sorry again but link is not working. I am unable to download it. Is it problem because of your ADSL ? You have a web site but may be openning project in Sourceforge.net can be usesful. Thanks On Mon, Feb 8, 2010 at 11:34 PM, Philip Balisterphi...@balister.org wrote: On 02/08/2010 04:29 PM, yerebakan wrote: Hi; Sorry , but I am unable to reach get the files from GNU radio sdk from philip at ... (in given adress) is it http adress or do we have to request by mail ? Ask by email :) This is a very preliminary image atm, as you can tell from my notes. The process is working for me though and I would appreciate some testing. I'll send you the link in a minute, it is on my DSL line, so the download speed is not great. Philip Thanks On Wed, Feb 3, 2010 at 8:25 PM, Philip Balisterphi...@balister.org wrote: From time to time people ask about building GNU Radio for the Beagleboard. In an attempt to make it easier for more people to work on this, I posted some notes at: http://www.opensdr.com/node/17 describing how to build GNU Radio on the Beagleboard (obviously building it cross is much faster, but you need to be aware of some tricky bits). I know this is all a bit vague, but hopefully someone finds it useful :) If you have Beagle specific questions, please ask those on the appropriate list/irc channel. I'll be glad to respond to GNU Radio specific issues here. Philip ___ 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 Halid Ziya Yerebakan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Saygılar; Halid Ziya Yerebakan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] gr_unpack_k_bits_bb, its inverse, and higher order constellations
Mattias Kjellsson wrote: Tom Rondeau wrote: On Thu, Mar 4, 2010 at 2:13 PM, Mattias Kjellsson m...@kth.se wrote: Tom Rondeau wrote: On Thu, Mar 4, 2010 at 11:38 AM, Mattias Kjellsson m...@kth.se wrote: Tom Rondeau wrote: On Thu, Mar 4, 2010 at 10:28 AM, Mattias Kjellsson m...@kth.se wrote: Eric Blossom wrote: I assume that you mean 1 byte per symbol. I suggest that you create *_ci and *_ii versions that handle 32-bits. Eric You are correct, one byte per symbol. Or one symbol per byte, whichever way one wants to look at it. To clarify what the custom block does is that it takes K bytes with 1 significant bit (in lsb, from a glfsr or similar) and turns it into 1 byte with K significant bits. Then it's just to feed these new, packed (is this the word for it?), bytes into the chunks_to_symbols_bc- block, producing one symbol for every byte. Is this really stupid, or has it just not been done yet? I assume that there are more people working with more signal- points than two in their constellations. But at the same time it seems like I'm wasting a lot of resources on copying bytes with only two or three (qpsk, qam16) significant bits in them... //Mattias Have you looked at gnuradio-core/src/python/gnuradio/blks2impl/dqpsk.py (and qam8, qam16, qam64, and qam256.py)? They handle the modulation and demodulation parts of the TX and RX. We don't have a good synchronization scheme, but I think these do what you want. Tom I know of them, and have looked at them, but nothing more. Since I don't speak python very well, I try to do everything in c++. I have tried to use pilots mixed in every few data- symbols and compensate the data- symbols using these known symbols. I'm getting kind of good results, although I think the custom early/late gate sampler I wrote has a settling time way to long (between 900 and 3000 symbols depending on which constants I put in). I'll try to rewrite the MM- sync- block to utilize the slicer_45deg(), and see what results I get with that. From what I can tell from the paper pointed to by the header- file, the optimized MM- loop should be able to handle at least QPSK, and have a way shorter settling time than 900 symbols. I think the pilot- compensation code should still work and compensate any screw to the constellation. I'm getting all exited just writing about it ;) I'll let you know how it goes. //Mattias Matt and I wrote a resampler based on polyphase filterbanks a few months ago. It's called gr_pfb_clock_sync_xxf (in the filter directory). It works really well for any PAM signal (we've tested it with PSK and QAMs successfully). You can see how its used in the new dbpsk2.py and dqpsk2.py files. Tom I will have a look, I haven't had the instant success I was hoping for with the MM- loop as I hoped... It might have something to do with the parameters, but I doubt it, since I see the constellation alright, but it still demodulates the symbols into bits incorrectly, ie. the loops have locked on a rotated constellation, and/or the compensation with the pilot- symbols doesn't do the trick/ is done incorrectly. Maybe if I stop and think about it some more. But that'll be tomorrow, since it is way past office hours here. Mattias Yes, at this point, the constellation is locked, but it's just locked with any 90 degree phase ambiguity (or 180 if bpsk). None of the sync loops understand this, so you'll probably have to map the symbols for the given rotation to the correct (transmitted) rotation. Tom I have now read the code, and tried it out a bit. A thing, just code- wise, I saw and wanted to ask about: Lines 49 and 57 in gr_pbf_clock_sync_ccf.cc, iosig is a std::vector from line 49, is there a reason that on line 57, there is a 4 instead of iosig.size() ? Or are these numbers just coincidently the same? Also I got this error: pilot_reveiver: ./gr_buffer.h:123: unsigned int gr_buffer::index_add(unsigned int, unsigned int): Assertion `s d_bufsize' failed. Aborted Which is new to me... I have isolated it to the the gr_pbf_sync_ccf- block. Since I don't see the error if I don't connect this block. This is how I create the block: d_symbol_extractor = gr_make_pfb_clock_sync_ccf (d_sps, 0.1, tr_taps, nfilts, nfilts/2, 0.1); where, d_sps = 8 tr_taps = gr_firdes::root_raised_cosine(nfilts, nfilts, 1.0/d_sps, 0.5, ntaps); nfilts = 32; ntaps = 11*(d_sps+nfilts); By looking at the error outputs, outputs[1-3] I get 9 points of data (samples_per_symbol + 1) out of gr_pfb_stync_block::work() by the looks of them it seems like it is some sort of transitioning going on on the first and third output, and a swinging output
Re: [Discuss-gnuradio] Transmit legit, become a ham
John Gilmore wrote: Unless you need to do frequency coordination, which you usually do. Then you have to deal with the oldest, gnarliest hams around, the ones who 50 years ago got access to mountaintop towers and have been squatting on them ever since, like trolls under bridges. Frequency coordination is voluntary in the amateur radio service. Unless you plan to operate in a band that is already packed with repeaters, you can, in most places, ignore frequency coordination; typically the local coordination body (if it functions at all, which is by no means a guarantee) has designated some range of frequencies as open use and you can just use those frequencies. And very few areas have meaningful coordination for the bands above 900 MHz; even if there is coordination in place for 33cm and up, odds are nobody will notice if you ignore it. Amateur radio frequency coordinators tend to be tinplated dictators with delusion of godhood. They also do not have the blessing of the FCC that they like to pretend they do, and furthermore their legal authority is entirely limited to repeaters (which they'd know if they had actually read the regulations that apply to them, which is unlikely). Things have changed since the 70s; a lot of the twerps you dealt with have died off by now. Kelly ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GNU Radio and OS Dev Forums
Hello, My name is Jamil Ben Alluch and I've recently finished setting up a website dedicated to providing Open Source projects with user based support, in other words message boards. I've already set a Forum on our page dedicated to GNU Radio that users may use or link to at their discretion. I am offering a free of charge service to the Open Source community, so it will be bear no cost to the project or the users. My goal is to offer free access to information for both users and project managers alike, as a my contribution to the projects that I've chosen to link to. I want to give the ability to users to communicate with people knowledgeable in multiple Open Source development projects in order to allow them to combine various development toolkits at once, something for which help is often hard to find in a single place. I am however still in the process of building my user base and ironing out some details on both the website and forums. The GNU Radio forum address on OS Dev Forums is: http://gnuradio.osdevforums.com. This address will link directly to the forum dedicated to GNU Radio. Our forums page is http://forums.osdevforums.com and our main site is http://www.osdevforums.com; All these links are easily accessible from the main page. Let me know If you have any questions, comments or suggestions. Thank you for your time and attention. Sincerely, -- Jamil Ben Alluch Ben Amar OS Dev Forums Founder http://www.osdevforums.com ja...@osdevforums.com ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Transmit legit, become a ham
On Fri, Mar 5, 2010 at 6:22 AM, John Gilmore g...@toad.com wrote: Nothing forces you to interact with other ham radio operators. You can happily work in isolation communicating among your own stations if you wish. Unless you need to do frequency coordination, which you usually do. Then you have to deal with the oldest, gnarliest hams around, the ones who 50 years ago got access to mountaintop towers and have been squatting on them ever since, like trolls under bridges. Mostly echoing what Kelly said... Operating in the DC suburbs I've never had need to coordinate, there is always plenty of inactive space on the 23cm band. Though perhaps in California (where there is a lot of 23cm activity, as I understand it) experiences may differ. Some of the amateur allocations overlap ISM allocations, so even the worst spectrum dictator would have little hope of micromanaging that. I suppose its a little different if you're looking to run something like a persistent packet BBS. I got a ham Tech license in the 1970-80's and it was one of the more disappointing experiences in my life. What a culture clash! The ham fraternity was filled with people who spent all their time chit-chatting on their handheld radios about their personal lives, but who knew and cared very little about radio technology or computers. (Nowadays everyone has cellphones, but in those days they were the only ones who could communicate mobile.) In my direct experience this has changed (Although I've only been licensed a couple of years, I've owned a radio for a decade and seen the decline and shift away). Between the internet, pervasive cell phones, SMS, and such people that simply want to chat have moved on to mediums which better support technophobes. Certainly they still exist, but today in most areas the bigger problem is under utilization of the allocations (especially the UHF/SHF ones) and the related fear that the allocations will be taken away. [snip] since. I think the hams are still doing 1200 bps FSK, while the unlicensed folks have evolved to 108,000,000 bps WiFi. At lower frequencies the latest fads involve low speed very narrow-band efficient modulations such as PSK-31, and other low speed fancy forward error corrected protocols which operate at near the information theoretic limit like JT65B. At higher frequencies D-STAR is becoming popular in some areas, and D-STAR depends on a proprietary, patent encumbered, and trade-secret speech codec. Of course, there are people running multimegabit and even WiFi systems operated under part 97 (e.g. switched into ham bands, or on the overlapping ISM segments but with the ham emission restrictions rather than the part 15) There must be tens of thousands of hams nationwide. There are tens of thousands of WiFi nodes in San Francisco alone -- and no crazy restrictions about not using encryption, not letting other people use your radio, etc. There are about 700k licensees. Who knows about how many are actually active, or even living. I could only assume that it would be significantly less than half. Of course, 99.999% of your WiFi nodes are just some Apple controlled appliances with users who even more are blissfully ignorant of how the technology works. It's great for facilitating communication, but the bulk of it isn't facilitating advancement of the art of radio engineering. Because the technology encourages ignorant usage any effort to build more intelligent infrastructure (meshes and such) has to contend with the interference from those tens of thousands of nodes with little to no hope for relief. It's a bit bogus to compare the lack of restrictions on ISM with the restrictions on ham radio. If your ISM radiated power is high enough to have any real range on your uncertified equipment, you're in clear violation of the FCC regulations. I suppose you could argue that enforcement is much more likely in the ham bands, and I suppose that may be true but I don't think it's fair or accurate to say that the restrictions are worse. The content, crypto, and usage restrictions are silly on ham radio, especially when compared with how people are using part 15 devices. I think the goals for spectrum management could be better achieved through other means. But getting the rules changed would require having new blood around to petition the FCC to change the rules. Cheers, ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GNU radio in college courses
Hello, I'm considering using GNU radio for an upcoming elective course I'll be offering in software defined radio. I'm looking for suggestions for textbooks, course material, etc. I'd also be interested in hearing about anyone experience good or bad who may have done this before. thanks, -Sam Keene Assistant Professor The Cooper Union ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GNU radio in college courses
On Fri, Mar 5, 2010 at 13:01, Sam Keene samke...@yahoo.com wrote: I'm considering using GNU radio for an upcoming elective course I'll be offering in software defined radio. I'm looking for suggestions for textbooks, course material, etc. I'd also be interested in hearing about anyone experience good or bad who may have done this before. Dr. Sharlene Katz of California State University Northridge has done something similar, and presented on SDR in Education at the last SDR Forum in December. It would be a good place to start. Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] IT++ functions
Hi All, I wanted to use some of the communication related signal processing functions in gnuradio. Has anyone done something on these lines before? Please let me know. Thank you! Pradyumna ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Failed to set center frequency (USRP2)
Hi all, I have a problem with the USRP2 board when working with the DBSRX daughter board. I am using the usrp2_rx_cfile.py file to collect some data with center frequency around 1.5GHz which is within the range of this daughter board, but it fails. The USRP2 works with the RFX 1800 board with this frequency. So I am confusing. Does anyone know the reason? -- Best Regards! ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Problem installing new module
The exact same code works on two other machines, both running OSX 10.5. The sink is a locally created modules, so it is entirely possible that there is something missing in the instantiation that is being caught on only on my machine and not at others (for what reason I cannot fathom). As an aside, another thing that might be helpful is that my python installation is partially broken: I have to move the installed .so .la files (as well as the python files) ouput from a make install from the /usr/local/lib onto the python script directory (as found during the configure step) /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages. On Mon, Mar 1, 2010 at 7:39 AM, Johnathan Corgan jcor...@corganenterprises.com wrote: On Mon, Mar 1, 2010 at 00:41, Sagar Kapare writetosag...@gmail.com wrote: RuntimeError: unable to resolve input endpoint sink_ff(0):0 The runtime doesn't like a reference you are passing to a 'connect' call. Check what you are putting in the connect call that you are wiring to 'sink_ff' input 0. It should be a properly instantiated gr block or hierarchical block. Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] IT++ functions
Pradyumna Desale wrote: Hi All, I wanted to use some of the communication related signal processing functions in gnuradio. Has anyone done something on these lines before? Please let me know. Thank you! Pradyumna ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio We have been planning to do this all the time but no progress yet :-( ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] IT++ functions
Hey Per, Thanks for replying! I wanted to start by incorporating channel models (channel.h if you are familiar with IT++) and was wondering if just writing a wrapper function in swig would do the necessary work for us or we have to make some specific changes to incorporate those codes in gnuradio framework. Any thoughts? For starters I am going to write a wrapping function for set_channel_profile() in channel.h (line no. 676) and another wrapper for virtual void generate (int no_samples, cvec output)=0 I was wondering if I should follow the guidelines of how to write a signal processing block or there is another method? I am not superbly confident with swig and it will be awesome to have someone to bounce ideas off of. Let me know. Cheers! -- Pradyumna On Fri, Mar 5, 2010 at 5:38 PM, Per Zetterberg per.zetterb...@ee.kth.sewrote: Pradyumna Desale wrote: Hi All, I wanted to use some of the communication related signal processing functions in gnuradio. Has anyone done something on these lines before? Please let me know. Thank you! Pradyumna ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio We have been planning to do this all the time but no progress yet :-( ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] usrp2_wfm_rcv.py
Hi Johnathan, Have you had any luck with this issue? The same is happening on my FLEX2400 with USRP2. Here is the full error message: ./usrp2_wfm_rcv.py -f 2.4G Using RX d'board 0x0007 This daughterboard does not cover the required frequency range for this application. Please use a BasicRX or TVRX daughterboard. Press ENTER to continue anyway, or Ctrl-C to exit. gr_fir_ccf: using SSE gr_fir_fff: using SSE Traceback (most recent call last): File ./usrp2_wfm_rcv.py, line 287, in module app = stdgui2.stdapp (wfm_rx_block, USRP2 WFM RX) File /usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py, line 36, in __init__ wx.App.__init__ (self, redirect=False) File /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py, line 7935, in __init__ self._BootstrapApp() File /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py, line 7509, in _BootstrapApp return _core_.PyApp__BootstrapApp(*args, **kwargs) File /usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py, line 39, in OnInit frame = stdframe (self.top_block_maker, self.title, self._nstatus) File /usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py, line 60, in __init__ self.panel = stdpanel (self, self, top_block_maker) File /usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py, line 81, in __init__ self.top_block = top_block_maker (frame, self, vbox, sys.argv) File ./usrp2_wfm_rcv.py, line 116, in __init__ self._build_gui(vbox, usrp_rate, demod_rate, audio_rate) File ./usrp2_wfm_rcv.py, line 199, in _build_gui callback=self.set_gain) File /usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/form.py, line 225, in __init__ nsteps = int((self.max-self.min)/self.step_size) ZeroDivisionError: float division Cheers, Mike On 11 December 2008 17:05, Johnathan Corgan jcor...@corganenterprises.comwrote: On Wed, Dec 10, 2008 at 4:02 PM, Catalin Lacatus claca...@us.toyota-itc.com wrote: For the first time I was using USRP2 with BasicRX. Also, I did some tests for different frequencies and gains with Basic RX and RFX2400. I got the same error This appears to be a bug in usrp2_wfm_rx.py, dealing with setting up the gain slider control in the GUI. I understand why this is happening with the BasicRX or LFRX, but not yet with the RFX2400. I'll look into this further soon. -Johnathan ___ 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] gr_unpack_k_bits_bb, its inverse, and higher order constellations
On Fri, Mar 05, 2010 at 04:26:34PM +0100, Mattias Kjellsson wrote:
Mattias Kjellsson wrote:
Tom Rondeau wrote:
Sorry, I just saw that I wrote the last message off- list.
Anyway, I have searched some more in the causes of this error. I took
the easy way out and looked in gr_buffer.h at line 127. and Changed this:
Approximately around lines 115-130 in gr_buffer.h
unsigned index_add (unsigned a, unsigned b){
unsigned s = a + b;
/*if (s = d_bufsize)
s -= d_bufsize;*/
while(s=d_bufsize){
s-=d_bufsize;
}
assert (s d_bufsize);
return s;
}
I assume this is not the way to do this, but it gets rid of the error-
message... But since I have changed in the library to make this specific
block not produce an error... It just seems like doing things backwards.
But then again, this code- change assures that sd_bufsize, but is it
always correct to do this? I guess not, but I'm not sure.
index_add is correct as originally written.
I suspect that pfb_clock_sync_ccf has a problem in it.
It looks like it only works if the number of output streams is 1 or 4,
but not 2 or 3. It needs to override check_topology to enforce this.
The two occurences of:
if(output_items.size() 2) {
...
}
should probably be changed to: if (output_items.size() == 4)
It also looks like it's leaking d_diff_filters (should delete in the
destructor).
Eric
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[Discuss-gnuradio] trellis encoder and OFDM modulator
Hi, I tried to use trellis_encoder from trellis package to perform convolution coding before sending the message to the OFDM modulator. However, ofdm_mod has zero input signature, and relies on send_pkt() which calls ofdm_packet_utils.make_packet() and then puts the message in the queue at gr.ofdm_mapper_bcv. Since the chain basically starts with ofdm_mod I don't see the way to connect the trellis_encoder before the signal is already modulated. In ftw80211 project they modify ofdm_packet_utils and write their own convolution coding method, I could do the same, but then I would miss all the benefits of this nice trellis package. Interestingly, the other modulation blocks such as dbpsk or d8psk have different input signatures, and I would put the trellis_encoder between the gr.message_source and modulator in pkt.py. Is there a way to seamlessly introduce trellis_encoder in the flow graph with an OFDM modulator? Am I missing something here? Thanks, Veljko ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
