[USRP-users] Compiling .cpp files
Hi, Can you please tell me how did you execute the .cpp files. Regards, Sneha ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[USRP-users] Tx_bursts
Hi Sumit, I am trying to send samples in bursts. How to compile this program tx_bursts. Because when compiled using command line arguments its showing error. /usr/local/src/uhd/host/examples$ ./tx_bursts --rate=1e6 --freq=100e6 --spb=8500 --repeat bash: ./tx_bursts: No such file or directory Can you please tell how where you to send burst samples. Regards, Sneha ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[USRP-users] Test clock syncronization
I am currently trying to check synchronization of usrp b210 device using octoclock. So when I am trying to execute ./test_clock_synch which is included in examples, I am seeing the following error, why it is not able to detect device? Can anybody tell me how I can do this?? :/usr/local/lib/uhd/examples$ ./test_clock_synch --usrp-args serial=313FA99 linux; GNU C++ version 5.4.0 20160609; Boost_105800; UHD_003.010.001.HEAD-0-gc705922a Creating the Clock device with: Error: LookupError: KeyError: No devices found for -> Empty Device Address Regards ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[USRP-users] File transfer from one usrp to another usrp
Hi Everyone, I am trying to transfer a text file from one Usrp B210 to another Usrp B210. I am able to see the frequency and time domain signal on transmission side. But I am not able to receive any signal on the receiver side and also no text information is received. please see the below attached flow graph and suggest me the mistake I am doing. Regards, Sneha file.grc Description: Binary data file receive.grc Description: application/gnuradio-grc ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[USRP-users] Filter Error
Hi everyone, Can anybody guide me on this???.. I am using x310 with sampling rate of 1MHz. Traceback (most recent call last): File "/home/sneha/My_waveform/past work/transmit.py", line 414, in main() File "/home/sneha/My_waveform/past work/transmit.py", line 402, in main tb = top_block_cls() File "/home/sneha/My_waveform/past work/transmit.py", line 250, in __init__ callback=lambda ok, payload: self.digital_ofdm_demod_0.recv_pkt(ok, payload), File "/usr/local/lib/python2.7/dist-packages/gnuradio/digital/ofdm.py", line 223, in __init__ options.log) File "/usr/local/lib/python2.7/dist-packages/gnuradio/digital/ofdm_receiver.py", line 78, in __init__ filter.firdes.WIN_HAMMING) # filter type File "/usr/local/lib/python2.7/dist-packages/gnuradio/filter/filter_swig.py", line 143, in low_pass return _filter_swig.firdes_low_pass(*args, **kwargs) RuntimeError: firdes check failed: 0 < fa <= sampling_freq / 2 Regards, sneha ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[USRP-users] Fwd: Varying delay in signal reception
-- Forwarded message - From: Sneha vasan Date: Thu, Aug 8, 2019 at 2:31 PM Subject: Varying delay in signal reception To: Hi everyone, I am transmitting a OFDM modulated random signal padded with zeros which is generated from the Matlab. I am transmitting this signal using USRP X310. But I am receiving the continuous random signal with the various delays in the first burst. This delay in receiving the signal is varying randomly with should certainly not happen when the parameters are constant. In my project I am using a 20cm MIMO Cable to connect TX and RX. Can you please tell how I am receive signal with a constant delay at receiver. Regards, Sneha ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
Re: [USRP-users] Fwd: Varying delay in signal reception
I want to know the time it takes to transmit and receive the signal,(which is in the sense delay). I calculate this based on the time instant I receive the signal. Since I was receiving the signal at different time instants. And currently I am receiving the delay of 1.9e-4sec, 2.3e-4, 2.1e-4s...so on. So I was just wondering is it common to receive this. And also with the cable length of 20cm I expect the delay to be in µs. Isn't it higher delay?. And I am transmitting a signal of 300µs continuously with 20MHz sampling rate. I dont know if I clear enough with my explanation. Can you be specific, if more details required. Regards, Sneha On Thu, Aug 8, 2019 at 9:51 PM Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > On 08/08/2019 01:32 PM, Michael Dickens via USRP-users wrote: > > Hi Sneha - Please "reply all" to keep the discussion on the USRP users > email list. More eyes reading these means a greater chance that folks will > jump in to help! > > The startup time for UHD / USRP / GR will be very similar between > different runs of the exact same flowgraph, but not exactly the same. If > you were to somehow measure these and plot them, I'd bet you'd get a curve > that looks Gaussian except with limits (a "truncated normal distribution"). > The exact same file being Tx'd over and again will have a slightly > different delay on Tx each time. > > Not sure this is what you're experiencing. If you don't think it is, then > please provide more information; what we have right now is pretty thin. > > Hope this is useful! - MLD > > I was going to make the same general comment--we don't have enough > information about exactly *what* you mean by "delay", and exactly > how you're measuring it. > > It's nearly impossible to get predictable-and-repeatable fine-scale > latency on a software-based system running on a general-purpose > operating-system like Linux or Windows. If your system-design requires > this to be so, then you have a problem with your system design. > > > On Thu, Aug 8, 2019, at 11:38 AM, Sneha vasan wrote: > > Hi Michael, > > I sent a email before I confirmed the subscription for the usrp users. So > I was wondering if I could receive the email back if replied in usrp lists. > So just forwarded once again just to be sure. Probably I would have put a > note there. > > I am generating the signal using Matlab and store it in a file and then > send it to the USRP using gnu-radio. So now when I make multiple recordings > of the signal at different time , I am receiving the signal at varying > intial delay . I except the delay to be constant as I am send same signal > and with same parameters. > > Regards, > Sneha > > > > > ___ > USRP-users mailing > listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > ___ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
