Re: [Discuss-gnuradio] RFX900 Filters
Wireless Monster wrote: Hi Matt, Thank you for your help. Can you point me to the board schematics to see where I should 'cut' :) Look on the board. You want to cut the filter out of the path, but you don't want to cut the main signal path. Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Re: Residual Frequency?
After doing some experiments I came out with another more important problem... Instead of my previous frequency that gave some residual, I tried the integer frequency 926M, so I get: Using TX d'board A: Flex 900 Tx MIMO B r.baseband_freq = 930M r.dxc_freq = -4M r.residual_freq = 0 r.inverted = False The issue is that on the spectrum analyzer I get the signal centered at 930 and not 926M. Any clue why the r.dxc offsset is not working? I check the 'tune' function and it should do... Thanks! On Fri, Apr 18, 2008 at 3:38 PM, Wireless Monster < [EMAIL PROTECTED]> wrote: > Hi All, > > I am trying to send a GSM modulated signal using the USRP and the RFX900 > board using the 'tune' function as in the provided usrp examples: > > r = self.u.tune(self.subdev._which, self.subdev, target_freq) > > The desired frequency is 925.6MHz, and I am getting a -381.47m > residual_frequency as shown below. > > What will be the best way to correct that, so I get the signal modulated > to the desired frequency? > > Thanks in advance to all for your help! > > ---8< > > Using TX d'board A: Flex 900 Tx MIMO B > r.baseband_freq = 930M > r.dxc_freq = -4.4M > r.residual_freq = -381.47m > r.inverted = False > > > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Residual Frequency?
Hi All, I am trying to send a GSM modulated signal using the USRP and the RFX900 board using the 'tune' function as in the provided usrp examples: r = self.u.tune(self.subdev._which, self.subdev, target_freq) The desired frequency is 925.6MHz, and I am getting a -381.47m residual_frequency as shown below. What will be the best way to correct that, so I get the signal modulated to the desired frequency? Thanks in advance to all for your help! ---8< Using TX d'board A: Flex 900 Tx MIMO B r.baseband_freq = 930M r.dxc_freq = -4.4M r.residual_freq = -381.47m r.inverted = False ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] RFX900 Filters
Hi Matt, Thank you for your help. Can you point me to the board schematics to see where I should 'cut' :) Rgds, On Fri, Apr 18, 2008 at 12:44 PM, Matt Ettus <[EMAIL PROTECTED]> wrote: > Wireless Monster wrote: > > > Hi all, > > > > Does anybody know if the ISM filter on the RFX900 board affects both the > > Rx and Tx paths or only the Rx? > > Is there a easy way to disable it? > > > > The filter affects both TX and RX, but not the auxiliary RX path (RX2). > If you just want to receive, use the 2nd SMA port and make sure to set that > in the software. If you want to bypass the filter for transmit, you will > need to put a cap of about 50 to 200 pF in the path, and cut the traces to > the filter. > > Matt > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GPS 20 ms accumulations
If you have data I could look at that would be great, but in my post I did not mention I am using a USRP I clocked externally with a signal generator. In your message you indicate that you were successful extending correlations to 20 ms when you used a better clock, which tells me I am screwing up somewhere. -- [EMAIL PROTECTED] NASA Goddard Space Flight Center AETD - Mission Engineering and Systems Analysis Component and Hardware Systems Branch Mail Code 596, Greenbelt Rd. Greenbelt, MD 20771 (301) 286-6565 (301) 286-3823 (fax) ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] phase difference between two real sinusoids
Greetings, I'm currently trying to find the phase difference between two real sinusoids. After looking through the archives of the mailing list, I found the following method: src1_f=your first source of data src2_f=your second source of data hilbert_coeffs = gr.firdes.hilbert (27) filter1 = gr.fir_filter_fcc(1, hilbert_coeffs) filter2 = gr.fir_filter_fcc(1, hilbert_coeffs) fg.connect(self.src1_f, self.filter1) fg.connect(self.src2_f, self.filter2) mult=gr.multiply_cc() c2conj=gr.conjugate_cc() c2arg=gr.complex_to_arg() fg.connect(filter1,(mult,0)) fg.connect(filter2,c2conj,(mult,1)) fg.connect(mult,c2arg) avg_alpha=0.01 avg=gr.single_pole_iir_filter_ff ( avg_alpha ) fg.connect(c2arg,avg) The problem with this method is that I'm starting out with two streams of floats. I'm using a hilbert filter to turn my signals into complex values, but when I do this my phase output is always in the range [0, 180] instead of [-180,180]. The magnitude of the phase seems to be accurate. Does anyone know how I can get around this? Thanks, Morgan Redfield___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] RFX900 Filters
Wireless Monster wrote: Hi all, Does anybody know if the ISM filter on the RFX900 board affects both the Rx and Tx paths or only the Rx? Is there a easy way to disable it? The filter affects both TX and RX, but not the auxiliary RX path (RX2). If you just want to receive, use the 2nd SMA port and make sure to set that in the software. If you want to bypass the filter for transmit, you will need to put a cap of about 50 to 200 pF in the path, and cut the traces to the filter. Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] RFX900 Filters
Hi all, Does anybody know if the ISM filter on the RFX900 board affects both the Rx and Tx paths or only the Rx? Is there a easy way to disable it? Thanks for your help! ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] CPU load
On Fri, Apr 18, 2008 at 10:21 AM, Wireless Monster <[EMAIL PROTECTED]> wrote: > Thank Martin, > However I was thinking in a way to measure the load of each gnuradio block. > Any clue? > Rgds, I know Eric likes to use oprofile: http://oprofile.sourceforge.net/about/ You will definitely get a real sense as to what's eating up your cycles, but it may be a bit too granular for most people. I have never used it, personally. Brian ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] CPU load
Thank Martin, However I was thinking in a way to measure the load of each gnuradio block. Any clue? Rgds, On Thu, Apr 17, 2008 at 12:00 PM, Martin Braun <[EMAIL PROTECTED]> wrote: > On Thu, Apr 17, 2008 at 10:58:31AM -0400, Wireless Monster wrote: > > Hi all, > > > > I am writting some new code to the USRP board using gnuradio and > sometimes I > > am getting the "uUuU" message, which I understand means that I am not > > feeding the usrp.sink module fast enough (right?) > > > > Is there a way to check what is the current CPU load? > > On a linux system? Try 'top', or a graphical tool that does the same > (KDE System Guard, for example). > > mb > > -- > Martin Braun > Institut fuer Nachrichtentechnik > Universitaet Karlsruhe > > http://www.int.uni-karlsruhe.de > > ___ > 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] Best GR-friendly Linux distro ... Ubuntu won !
Hi all, Currently is available version 3.1.2 in the Fedora testing repository. Everyone can test it via cmd: yum -y install --enablerepo=updates-testing gnuradio usrp and sumbit feedback here: https://admin.fedoraproject.org/updates/F8/FEDORA-2008-3118 Pavol Duris Yay! Small correction: GNU Radio is also available for F-8, but is currently only available in the testing repository. Depending in the amount of feedback it receives it will be moved to the stable repository within the next week (faster if positive feedback is received). You can easily submit feedback here: https://admin.fedoraproject.org/updates/F8/FEDORA-2008-2771 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
