Re: [Discuss-gnuradio] Three different USRP2 nodes are transmitting with almost exactly 1 MHz frequency offset
Hi all - I'm glad the update fixed it for you! Cheers, Ben On Sat, Feb 11, 2012 at 3:56 PM, shantharam balasubramanian < shantharam...@gmail.com> wrote: > Hi Ben, > > I am happy to hear from Nazmul that the image works. > > > > > Thanks a lot for your help. > > > Have a nice weekend > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Three different USRP2 nodes are transmitting with almost exactly 1 MHz frequency offset
Hi Ben, I am happy to hear from Nazmul that the image works. Thanks a lot for your help. Have a nice weekend ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Three different USRP2 nodes are transmitting with almost exactly 1 MHz frequency offset
Hello Ben, Shantharam, my colleague, installed the latest UHD image. Now I don't see the 1 MHz frequency offset any more. The benchmark_rx program is also receiving packets correctly from the benchmark_tx code. Thanks a lot for your help. We really appreciate your effort. Nazmul On Thu, Feb 9, 2012 at 12:44 PM, Ben Hilburn wrote: > Nazmul - > > Your version of UHD is from November 22nd. Will you try updating your UHD > install? > > I'm not sure how you installed, or how familiar you are with git / Linux > - here is a quick command list, assuming you used Git to checkout the code > to begin with, and it is in a directory called uhd.git/ > > $ cd uhd.git > $ git checkout master > $ git remote update; git pull > $ rm -rf build > $ mkdir build; cd build > $ cmake ../ && make > > Let us know how it goes! > > Cheers, > Ben > > On Wed, Feb 8, 2012 at 8:52 PM, Nazmul Islam > wrote: > >> Thanks for the reply, Jason. The uhd_usrp_probe --version command gave >> the following result: >> >> linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.004.000-71810ad >> >> 003.004.000-71810ad >> >> Do I have to download the latest UHD image? The image that I am using >> right now was downloaded by one of my colleagues and I think that he did it >> recently. >> >> Also, I tried running the benchmark_tx and benchmark_rx codes with a 1 >> MHz frequency offset input, i.e., I gave the following commands: >> >> ./benchmark_tx.py -f 2.4G -r 1M -m gmsk -a "addr = 192.168.10.2" >> >> ./benchmark_tx.py -f 2.401G -r 1M -m gmsk -a "addr = 192.168.10.2" >> >> Since the uhd_fft.py and the my lab spectrum analyzer show a 1 MHz >> frequency offset, I assumed that the above commands would work. >> Unfortunately, this did not help either! >> >> Suggestions will be very appreciated. >> >> Thanks, >> >> Nazmul >> >> >> >> >> On Wed, Feb 8, 2012 at 7:37 PM, Jason Abele wrote: >> >>> On Wed, Feb 08, 2012 at 06:39:24PM -0500, Nazmul Islam wrote: >>> > Hello, >>> > >>> > I am running the benchmark_tx.py codes and looking at the spectrum of >>> the >>> > signals using uhd_fft.py. I am using the latest image of GNU radio >>> > (GNUradio 3.5) and I have XCVR2450 daughterboards. I ran the >>> > benchmark_tx.py code in three transmitter nodes and surprisingly, all >>> of >>> > them are transmitting with 1 MHz frequency offset! I have attached two >>> > screenshots with the email (I hope that they go through). I give the >>> > following input parameters to run the benchmark_tx code. >>> > >>> > ./benchmark_tx.py -f 2.4G -r 1M -m gmsk -M 10 -a "addr = 192.168.10.2" >>> > >>> > Both uhd_fft.py and the spectrum analyzer of my laboratory show that >>> the >>> > received signal is centered at 2.401 GHz. I varied the frequency to >>> 2.45 >>> > GHz, 2.41 GHz, but this 1 MHz frequency shift persists. >>> > >>> > When I run the benchmark_rx.py code at the receiver nodes, they don't >>> > receive/detect any packets (due to the frequency offset, I guess). I >>> even >>> > tried to run the transmitter at 2.4 GHz and the receiver at 2.401 GHz. >>> > However, that did not help either! >>> > >>> > I will try to modify the control loop gain parameters using Tom's blogs >>> > suggestions and see if that helps. However, I am really surprised to >>> see >>> > how all three different transmitter nodes can transmit with almost >>> exactly >>> > 1 MHz frequency offset. Any suggestion will be appreciated. >>> > >>> >>> Can you tell us which version of UHD you are using? >>> (uhd_usrp_probe --version) >>> >>> We have heard reports of such an issue and my best guess is that it was >>> related to an accidental swap of I and Q in the XCVR2450 transmitter >>> code. This went in after the 3.3.2 release and is fixed on latest UHD >>> master since 837437c65ce36d418cceb3df5b093f9497b3af5f >>> >>> Jason >>> >> >> >> >> -- >> Muhammad Nazmul Islam >> >> Graduate Student >> Electrical & Computer Engineering >> Wireless Information & Networking Laboratory >> Rutgers, USA. >> >> >> ___ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > -- Muhammad Nazmul Islam Graduate Student Electrical & Computer Engineering Wireless Information & Networking Laboratory Rutgers, USA. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Three different USRP2 nodes are transmitting with almost exactly 1 MHz frequency offset
Nazmul - Your version of UHD is from November 22nd. Will you try updating your UHD install? I'm not sure how you installed, or how familiar you are with git / Linux - here is a quick command list, assuming you used Git to checkout the code to begin with, and it is in a directory called uhd.git/ $ cd uhd.git $ git checkout master $ git remote update; git pull $ rm -rf build $ mkdir build; cd build $ cmake ../ && make Let us know how it goes! Cheers, Ben On Wed, Feb 8, 2012 at 8:52 PM, Nazmul Islam wrote: > Thanks for the reply, Jason. The uhd_usrp_probe --version command gave the > following result: > > linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.004.000-71810ad > > 003.004.000-71810ad > > Do I have to download the latest UHD image? The image that I am using > right now was downloaded by one of my colleagues and I think that he did it > recently. > > Also, I tried running the benchmark_tx and benchmark_rx codes with a 1 MHz > frequency offset input, i.e., I gave the following commands: > > ./benchmark_tx.py -f 2.4G -r 1M -m gmsk -a "addr = 192.168.10.2" > > ./benchmark_tx.py -f 2.401G -r 1M -m gmsk -a "addr = 192.168.10.2" > > Since the uhd_fft.py and the my lab spectrum analyzer show a 1 MHz > frequency offset, I assumed that the above commands would work. > Unfortunately, this did not help either! > > Suggestions will be very appreciated. > > Thanks, > > Nazmul > > > > > On Wed, Feb 8, 2012 at 7:37 PM, Jason Abele wrote: > >> On Wed, Feb 08, 2012 at 06:39:24PM -0500, Nazmul Islam wrote: >> > Hello, >> > >> > I am running the benchmark_tx.py codes and looking at the spectrum of >> the >> > signals using uhd_fft.py. I am using the latest image of GNU radio >> > (GNUradio 3.5) and I have XCVR2450 daughterboards. I ran the >> > benchmark_tx.py code in three transmitter nodes and surprisingly, all of >> > them are transmitting with 1 MHz frequency offset! I have attached two >> > screenshots with the email (I hope that they go through). I give the >> > following input parameters to run the benchmark_tx code. >> > >> > ./benchmark_tx.py -f 2.4G -r 1M -m gmsk -M 10 -a "addr = 192.168.10.2" >> > >> > Both uhd_fft.py and the spectrum analyzer of my laboratory show that the >> > received signal is centered at 2.401 GHz. I varied the frequency to 2.45 >> > GHz, 2.41 GHz, but this 1 MHz frequency shift persists. >> > >> > When I run the benchmark_rx.py code at the receiver nodes, they don't >> > receive/detect any packets (due to the frequency offset, I guess). I >> even >> > tried to run the transmitter at 2.4 GHz and the receiver at 2.401 GHz. >> > However, that did not help either! >> > >> > I will try to modify the control loop gain parameters using Tom's blogs >> > suggestions and see if that helps. However, I am really surprised to see >> > how all three different transmitter nodes can transmit with almost >> exactly >> > 1 MHz frequency offset. Any suggestion will be appreciated. >> > >> >> Can you tell us which version of UHD you are using? >> (uhd_usrp_probe --version) >> >> We have heard reports of such an issue and my best guess is that it was >> related to an accidental swap of I and Q in the XCVR2450 transmitter >> code. This went in after the 3.3.2 release and is fixed on latest UHD >> master since 837437c65ce36d418cceb3df5b093f9497b3af5f >> >> Jason >> > > > > -- > Muhammad Nazmul Islam > > Graduate Student > Electrical & Computer Engineering > Wireless Information & Networking Laboratory > Rutgers, USA. > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Three different USRP2 nodes are transmitting with almost exactly 1 MHz frequency offset
Thanks for the reply, Jason. The uhd_usrp_probe --version command gave the following result: linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.004.000-71810ad 003.004.000-71810ad Do I have to download the latest UHD image? The image that I am using right now was downloaded by one of my colleagues and I think that he did it recently. Also, I tried running the benchmark_tx and benchmark_rx codes with a 1 MHz frequency offset input, i.e., I gave the following commands: ./benchmark_tx.py -f 2.4G -r 1M -m gmsk -a "addr = 192.168.10.2" ./benchmark_tx.py -f 2.401G -r 1M -m gmsk -a "addr = 192.168.10.2" Since the uhd_fft.py and the my lab spectrum analyzer show a 1 MHz frequency offset, I assumed that the above commands would work. Unfortunately, this did not help either! Suggestions will be very appreciated. Thanks, Nazmul On Wed, Feb 8, 2012 at 7:37 PM, Jason Abele wrote: > On Wed, Feb 08, 2012 at 06:39:24PM -0500, Nazmul Islam wrote: > > Hello, > > > > I am running the benchmark_tx.py codes and looking at the spectrum of the > > signals using uhd_fft.py. I am using the latest image of GNU radio > > (GNUradio 3.5) and I have XCVR2450 daughterboards. I ran the > > benchmark_tx.py code in three transmitter nodes and surprisingly, all of > > them are transmitting with 1 MHz frequency offset! I have attached two > > screenshots with the email (I hope that they go through). I give the > > following input parameters to run the benchmark_tx code. > > > > ./benchmark_tx.py -f 2.4G -r 1M -m gmsk -M 10 -a "addr = 192.168.10.2" > > > > Both uhd_fft.py and the spectrum analyzer of my laboratory show that the > > received signal is centered at 2.401 GHz. I varied the frequency to 2.45 > > GHz, 2.41 GHz, but this 1 MHz frequency shift persists. > > > > When I run the benchmark_rx.py code at the receiver nodes, they don't > > receive/detect any packets (due to the frequency offset, I guess). I even > > tried to run the transmitter at 2.4 GHz and the receiver at 2.401 GHz. > > However, that did not help either! > > > > I will try to modify the control loop gain parameters using Tom's blogs > > suggestions and see if that helps. However, I am really surprised to see > > how all three different transmitter nodes can transmit with almost > exactly > > 1 MHz frequency offset. Any suggestion will be appreciated. > > > > Can you tell us which version of UHD you are using? > (uhd_usrp_probe --version) > > We have heard reports of such an issue and my best guess is that it was > related to an accidental swap of I and Q in the XCVR2450 transmitter > code. This went in after the 3.3.2 release and is fixed on latest UHD > master since 837437c65ce36d418cceb3df5b093f9497b3af5f > > Jason > -- Muhammad Nazmul Islam Graduate Student Electrical & Computer Engineering Wireless Information & Networking Laboratory Rutgers, USA. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Three different USRP2 nodes are transmitting with almost exactly 1 MHz frequency offset
On Wed, Feb 08, 2012 at 06:39:24PM -0500, Nazmul Islam wrote: > Hello, > > I am running the benchmark_tx.py codes and looking at the spectrum of the > signals using uhd_fft.py. I am using the latest image of GNU radio > (GNUradio 3.5) and I have XCVR2450 daughterboards. I ran the > benchmark_tx.py code in three transmitter nodes and surprisingly, all of > them are transmitting with 1 MHz frequency offset! I have attached two > screenshots with the email (I hope that they go through). I give the > following input parameters to run the benchmark_tx code. > > ./benchmark_tx.py -f 2.4G -r 1M -m gmsk -M 10 -a "addr = 192.168.10.2" > > Both uhd_fft.py and the spectrum analyzer of my laboratory show that the > received signal is centered at 2.401 GHz. I varied the frequency to 2.45 > GHz, 2.41 GHz, but this 1 MHz frequency shift persists. > > When I run the benchmark_rx.py code at the receiver nodes, they don't > receive/detect any packets (due to the frequency offset, I guess). I even > tried to run the transmitter at 2.4 GHz and the receiver at 2.401 GHz. > However, that did not help either! > > I will try to modify the control loop gain parameters using Tom's blogs > suggestions and see if that helps. However, I am really surprised to see > how all three different transmitter nodes can transmit with almost exactly > 1 MHz frequency offset. Any suggestion will be appreciated. > Can you tell us which version of UHD you are using? (uhd_usrp_probe --version) We have heard reports of such an issue and my best guess is that it was related to an accidental swap of I and Q in the XCVR2450 transmitter code. This went in after the 3.3.2 release and is fixed on latest UHD master since 837437c65ce36d418cceb3df5b093f9497b3af5f Jason ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
