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 <mnis...@winlab.rutgers.edu>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 <ja...@ettus.com> 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 > >
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