[Discuss-gnuradio] sdr_seminar_2002.pdf
Hi Matt, Kindly, Can you give us a link to your sdr_seminar_2002.pdf file ? Firas -- View this message in context: http://www.nabble.com/sdr_seminar_2002.pdf-tf4039355.html#a11475953 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
Re: [Discuss-gnuradio] FCC creates obstacles for Open Source software radio
On Friday 06 July 2007, Philip Balister wrote: Found on /. I wonder how much Cisco paid for the words http://news.com.com/Feds+snub+open+source+for+smart+radios/2100-1041_3-6195 102.html?tag=nefd.lede Well, quite honestly, Cisco's only costs would have been the lawyer time and the filing of the petition. This action to me seems rather reasonable. The only software that the FCC is worried about is that which sets the radio's operating mode, emission mask, and transmit power. Given the FCC's well-known reticence to radio anarchy this is as much of a concession as could be expected at this time. Yes, I said concession. This is actually a relaxation of the interpretation of the rule; the FCC recognized the usefulness of open source in this, and intentionally narrowed the scope. The specific mention of amateur equipment (if you think of the USRP as a radio, it is amateur equipment; it is, however, marketed as test equipment (and the part 15 rules apply)) is a very good thing. Petitions can be filed to this M RO too, if the new rule isn't to anyone's liking. But is open source less secure, when the item being secured is 'how do I manipulate the operating frequency, power, and mode of this radio?' Discussion, anyone? -- Lamar Owen Chief Information Officer Pisgah Astronomical Research Institute 1 PARI Drive Rosman, NC 28772 (828)862-5554 www.pari.edu ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Mode S and ADS-B
Matt Ettus wrote: Eric A. Cottrell wrote One thing to try is to use the scope program to set the threshold. The default is low for alot of front ends including the DBSRX. The DBSRX tends to be deaf. Also I find a gain setting of 32 to 36 seems to work best for the DBSRX. The DBSRX typically has a noise figure around 3-5dB. I wouldn't call that deaf. You are connecting a discone to a wide open front end without a filter, so it is far more likely that you are experiencing desense from the thousands of other signals you are picking up. Also, raising the gain above 32 would reduce the noise figure you see. Getting the antenna up in the clear is important. A discone will work if you have a good receiver but I found building a simple 1/4 wave ground plane on an N connector beats out the discone. Hello, Well I got spoiled with my AOR 5000 as a front end. It uses a GAs MES FET as a front end for 1.0 to 1.6 GHz. Unfortunely the GAs MES FET is not working but it only cuts the range in half. I was using an external Preamp but that got broken when I hooked it up in the car. I assume when they say 12 volts that they mean 12 volts and not over 13.6 volts. I tended to use 36 as gain for the DBSRX. I used my DBSRX board yesterday and got different results from earlier tests. It appears the Maxium chip is working but the LNA is gone. Time to order another one. Probably because it is more frequency selective than the discone, thus reducing the strong interferers. When you set up a discone on the DBSRX you need to understand that you are picking up multiple cellphone bands, the pager bands, 2 ISM bands, microwave ovens, radars, etc, in addition to the nice weak signals you are looking for. Not to mention the decrease of gain from the discone. Another factor at my station is my discone is lower and has more blockage. I need to replace the coax at my test antenna site because the N connector came off and the coax got exposed to the rain. I am upset because I want to test my code to make sure my later changes did not break anything but hardware keep breaking! So it may be possible the code in my branch does not work as good as past code. I want to do some testing of various setups but I need to get everything working again. :( 73 Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Problem with usrp_fft.py
Hi all: I am new to this group and I am GNU radios to listen to a band of frequencies and see the spectrum by computing the FFT. The following command ./usrp_fft.py -R B -f 1e6 data_fft_1_2.dat results in the following error.. Should I have some display settings to avoid this? And why do I get a segmentation fault? Traceback (most recent call last): File ./usrp_fft.py, line 251, in ? main () File ./usrp_fft.py, line 247, in main app = stdgui.stdapp(app_flow_graph, USRP FFT, nstatus=1) File /usr/local/lib/python2.4/site-packages/gnuradio/wxgui/stdgui.py, line 36, in __init__ wx.App.__init__ (self, redirect=False) File /usr/lib/python2.4/site-packages/wx-2.6-gtk2-unicode /wx/_core.py, line 7700, in __init__ self._BootstrapApp() File /usr/lib/python2.4/site-packages/wx-2.6-gtk2-unicode/wx/_core.py, line 7352, in _BootstrapApp return _core_.PyApp__BootstrapApp(*args, **kwargs) SystemError: wxEntryStart failed, unable to initialize wxWidgets! (Is DISPLAY set properly?) Segmentation fault ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] FCC CDR/SDR Order from a PC site
On 7/6/07, Robert McGwier [EMAIL PROTECTED] wrote: Here is a PC site for the paranoid: Thanks Bob. It looks pretty boring as far as I can tell. Here's an excerpt of the part about amateur radio: 6. In regard to MSS' request for clarification about the regulatory treatment of amateur radio equipment, the Commission did not intend to impose any new certification requirements for amateur radio equipment in the Cognitive Report and Order. External RF amplifiers that operate below 144 MHz that are marketed for use with amateur stations will continue to require certification before they can be marketed. Other amateur radio equipment, including equipment that meets the definition of a software defined radio and that has software that is designed or expected to be modified by a party other than the manufacturer, will continue to be exempt from a certification requirement. However, as the Commission noted in the Cognitive Report and Order, certain unauthorized modifications of amateur transmitters are unlawful. It may revisit the issue of the certification of amateur equipment with software modifiable features as identified above in the future if misuse of such devices results in significant interference to authorized spectrum users. -Michael, VE3TIX ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] PS3 and gnuradio
I see that you can buy a PS3 now with YDL linux installed. (http://www.terrasoftsolutions.com/products/sony/) How are the efforts to get gnu radio running on it going? I don't play video games but I'm seriously considering buying to get the bluray player, Would be great if I can run gnuradio too. Thanks, Clark _ http://liveearth.msn.com ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] FCC creates obstacles for Open Source software radio
On Sat, Jul 07, 2007 at 09:29:37AM -0400, Lamar Owen wrote: On Friday 06 July 2007, Philip Balister wrote: Found on /. I wonder how much Cisco paid for the words http://news.com.com/Feds+snub+open+source+for+smart+radios/2100-1041_3-6195 102.html?tag=nefd.lede Well, quite honestly, Cisco's only costs would have been the lawyer time and the filing of the petition. This action to me seems rather reasonable. The only software that the FCC is worried about is that which sets the radio's operating mode, emission mask, and transmit power. Given the FCC's well-known reticence to radio anarchy this is as much of a concession as could be expected at this time. Do you think that the software that concerns the FCC is concerned with must reside in the radio? Sometimes the transmission parameters such as modulation, mask, and power are under control of the host computer. If the FCC's definition of software-defined radio encompasses software running on the host computer, then it seems that they have encumbered the development of open-source software for a broad category of devices, including most of the 802.11 radios on the market. I feel certain that this was not their intention, but I do not think one can tell by reading the law alone, and that is worrisome. What do you think? But is open source less secure, when the item being secured is 'how do I manipulate the operating frequency, power, and mode of this radio?' Discussion, anyone? I do not think open source is less secure. Commercial software is developed under enormous time pressure for very narrow purposes by teams of developers that are oftentimes insulated from outside ideas and criticism by corporate secrecy, IP paranoia, and the not invented here syndrome. The narrow purposes of commercial development do include best performance for the price on the market; they do not include show how our security measures can be defeated and our equipment exploited to interfere with television broadcast. There is less time, and there are fewer persons for finding defects in a commercial development than in open-source development. Developing out in the open exposes your security measures to the diverse purposes of a wider segment of companies, of hobbyists, of academic researchers, and---let us admit---of bad guys. In this way, I believe an open-source community will detect more security problems in a product before a firm sends it to market than if the product had survived the scrutiny of one firm's developers alone. Dave -- David Young OJC Technologies [EMAIL PROTECTED] Urbana, IL * (217) 278-3933 ext 24 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] PS3 and gnuradio
So far I have been unable to get the python to work properly on any Power PC running Linux. It runs on Mac OSX but not PPC. For example, make check fails in a segmentation error in the base routine that runs the actual checks. It is no trouble at all to get GnuRadio to make and install on the PS3 running FC6. It took me about 3 hours. It is just that nothing runs after that. Eric Blossom is going to begin work on getting GnuRadio to run on the Cell processor after he returns from vacation later this month. I am certain he will resolve this issue early in the process. Bob Clark Pope wrote: I see that you can buy a PS3 now with YDL linux installed. (http://www.terrasoftsolutions.com/products/sony/) How are the efforts to get gnu radio running on it going? I don't play video games but I'm seriously considering buying to get the bluray player, Would be great if I can run gnuradio too. Thanks, Clark _ http://liveearth.msn.com ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair If you're going to be crazy, you have to get paid for it or else you're going to be locked up. Hunter S. Thompson ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
