Re: [USRP-users] Timeout On Chan 0 Error

2018-05-23 Thread Peter Sanchez via USRP-users
Hi All, Tutorial aside, I was running the rfnoc_fir example from GNU Radio Companion. At 10M sample rate, the example works with no errors. At 50M sample rate the graphs show data while the terminal prints "overrun on chan 0" errors, then eventually the graphs freeze and the terminal prints "timeou

Re: [USRP-users] B210 initial tickcount offset

2018-05-23 Thread Thomas via USRP-users
Hi again I figured out the flow and discrepancy between "now" in "new_rx_control.v" and "radio_ctrl_proc.v". The first is a time set in the register "RX_CTRL_TIME" the second is 'command issuing time'. And typically the "RX_CTRL_TIME" is written without a 'command issuing time' and hence HAS_T

Re: [USRP-users] Using X310 without RFNoC

2018-05-23 Thread Derek Kozel via USRP-users
Hello Koen, To extend Marcus' answer, here is a link to the example with three areas of particular interest highlighted. https://github.com/EttusResearch/uhd/blob/rfnoc-devel/host/examples/rfnoc_rx_to_file.cpp#L292 https://github.com/EttusResearch/uhd/blob/rfnoc-devel/host/examples/rfnoc_rx_to_fi

Re: [USRP-users] IQ baseband fade?

2018-05-23 Thread Brian Padalino via USRP-users
Try disabling automatic DC offset removal, or performing an offset tuning operation. Brian On Wed, May 23, 2018 at 3:50 PM Martin K via USRP-users < usrp-users@lists.ettus.com> wrote: > BPSK modulated RF at 2.2 GHz, -15dBm, feeding a power splitter >> | >> (A) --> -9dB pad --> B210 >> (B) --> Ag

Re: [USRP-users] IQ baseband fade?

2018-05-23 Thread Martin K via USRP-users
> > BPSK modulated RF at 2.2 GHz, -15dBm, feeding a power splitter > | > (A) --> -9dB pad --> B210 > (B) --> Agilent VSA. > > > TX Symbol rate is 1389 Hz and RX symbol rate was set to 5556 Hz to give > the illusion of 4 symbols high and 4 symbols low. () which is what > you see illustrated

Re: [USRP-users] IQ baseband fade?

2018-05-23 Thread Marcus D. Leech via USRP-users
On 05/23/2018 03:13 PM, Martin K via USRP-users wrote: Hello, I have B210 hooked up to a signal generator putting out BPSK. When I look at the signal on a signal analyzer I see what I expect: the baseband, synchronized 'I' signal looks like a square wave. (Fig.1) When I capture the signal with

Re: [USRP-users] Timeout On Chan 0 Error

2018-05-23 Thread Peter Sanchez via USRP-users
Hi Jonathon, The test bench passes cases 1-4 but hangs on case 5. I even copied the noc_block_gain.v and noc_block_gain_tb.sv from the reference files attached on the tutorial website, and the test bench results are the same (hangs on case 5). Then I tried not loading the tutorial Gain module to t

Re: [USRP-users] Using X310 without RFNoC

2018-05-23 Thread Marcus D. Leech via USRP-users
On 05/23/2018 04:55 AM, TIMMEN Koen via USRP-users wrote: All online help I could find explains me how to create custom IP and use this in combination with the target images provided, which then require me to use gnuradio again. If someone could verify or correct my current understanding of t

[USRP-users] IQ baseband fade?

2018-05-23 Thread Martin K via USRP-users
Hello, I have B210 hooked up to a signal generator putting out BPSK. When I look at the signal on a signal analyzer I see what I expect: the baseband, synchronized 'I' signal looks like a square wave. (Fig.1) When I capture the signal with the B210 and view it in GNU Radio or MATLAB, the square wa

Re: [USRP-users] B210 initial tickcount offset

2018-05-23 Thread Thomas via USRP-users
Hi Ian: that was also partly what we figured out, so thanks for confirming. But maybe someone can help clarify the start flow at a specific vita time from fpga-source. The "set_stb" generated in "radio_ctrl_proc.v", seems to depend on "vita_time" equal "trigger_time" ie. "now" in case "HAS_TIM

Re: [USRP-users] B210 initial tickcount offset

2018-05-23 Thread Ian Buckley via USRP-users
There is a certain amount of (deterministic) latency incurred in the pipelining of H/W signals, both data and control. The tick count applied to the data will be accurate w.r.t the instant the data left the DDC and was packetized. -Ian > On May 23, 2018, at 2:26 AM, kf via USRP-users > wrote

Re: [USRP-users] Using X310 without RFNoC

2018-05-23 Thread Ian Buckley via USRP-users
Koen, Don’t feel bad….I designed the X310 Crossbar, and I had never heard the term RTR used until I read your email! So to summarize the RFNoC concept, (since I’m no longer involved with the current implementation): The “RTR” encompasses all the functionality that transports data between RFNoC

Re: [USRP-users] IQ Imbalance calibration files

2018-05-23 Thread Marcus D. Leech via USRP-users
On 05/23/2018 10:46 AM, kunal sankhe via USRP-users wrote: Hi, Using *uhd_cal_tx_iq_balance* and *uhd_cal_rx_iq_balance*, I am able to find the coefficients of IQ Imbalance. However, I am having difficulty in interpreting these results. 1) In calibration file, at lo_frequency=915MHz, correc

[USRP-users] IQ Imbalance calibration files

2018-05-23 Thread kunal sankhe via USRP-users
Hi, Using *uhd_cal_tx_iq_balance* and *uhd_cal_rx_iq_balance*, I am able to find the coefficients of IQ Imbalance. However, I am having difficulty in interpreting these results. 1) In calibration file, at lo_frequency=915MHz, correction_real=-0.00548 and correction_imag=0.00960. How can I estimat

Re: [USRP-users] Timeout On Chan 0 Error

2018-05-23 Thread Jon Pendlum via USRP-users
Hi Peter, Does the testbench you make as part of the tutorial work? Jonathon On Wed, May 23, 2018, 12:09 PM Peter Sanchez via USRP-users < usrp-users@lists.ettus.com> wrote: > Hello, > > I have a USRP X310 and just finished going through the RFNoC Getting > Started tutorial. After uploading th

Re: [USRP-users] Question regarding the term "wrt A/D full scale" on OpenBTS

2018-05-23 Thread Neel Pandeya via USRP-users
Hello Oscar: The maximum safe input power for the B200/B210 is 0 dBm. But that is not the level that is full-scale on the ADC. You will need to determine empirically what input power level results in a full-scale signal on the ADC. --​Neel Pandeya On 22 May 2018 at 13:33, Nick Foster via USRP

Re: [USRP-users] B210 Frequency Offset

2018-05-23 Thread Teemu Veijalainen via USRP-users
Hi, The problem was solved. It seems that I didn’t select GPSDO as source. MATLAB doesn’t allow to select GPSDO (or I don’t know how). With GnuRadio I was able to select GPSDO and the frequency error is now around 30 Hz in 3.75GHz. Br, Teemu From: Derek Kozel [mailto:derek.ko...@ettus.com] S

[USRP-users] B210 GPSDO - stationary mode

2018-05-23 Thread kf via USRP-users
Hi I am currently using a GPSDO on a B210 board. The specific unit is the one listed on https://www.ettus.com/product/details/GPSDO-TCXO-MODULE I am observing that the positions reported by the GPSDO is slowly moving around. Since the system is not moved, the GPS is stationary. A GPSDO user manu

[USRP-users] B210 initial tickcount offset

2018-05-23 Thread kf via USRP-users
Hi. I am having trouble understanding why the first samples I receive have a tick count offset of 7. My setup is:  - B210 with gpsdo  - Time source and reference set to 'gspdo'  - Two-channel RX  - Sample rate set to 16Mhz The procedure is then to  - Reset to time to 0 using the PPS signal  - Re

[USRP-users] Using X310 without RFNoC

2018-05-23 Thread TIMMEN Koen via USRP-users
Hello everyone, Since a couple of months now, I've begun to work with FPGA development and have been using RFNoC and the USRP X310 specifically. In other words, I'm just starting to figure out this technology and still struggling with some of the concepts used by the new USRP architecture and e