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
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
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
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
>
> 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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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