On 08/21/2018 12:48 PM, Nicole Bienert wrote:
Thanks for the response!
When I use the --null option, it automatically sets the BW to 1MHz.
Here is the terminal output:
You still need to use the other options, the --null option just arranges
for the file output to not happen--roughly equivalent to using
"/dev/null" as the output file.
nlb5224@nlb5224-VirtualBox:~/workarea-uhd/uhd/host/examples/rx_samples_to_file_internet/build$
./rx_samples_to_file --null
[INFO] [UHD] linux; GNU C++ version 7.3.0; Boost_106501;
UHD_3.11.0.HEAD-0-ga1b5c4ae
[WARNING] [UHD] Unable to set the thread priority. Performance may be
negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam
Creating the usrp device with: ...
[INFO] [B200] Detected Device: B205mini
[INFO] [B200] Operating over USB 3.
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [AD936X] Performing CODEC loopback test...
[INFO] [AD936X] CODEC loopback test passed
[INFO] [B200] Setting master clock rate selection to 'automatic'.
[INFO] [B200] Asking for clock rate 16.000000 MHz...
[INFO] [B200] Actually got clock rate 16.000000 MHz.
[INFO] [CORES] Performing timer loopback test...
[INFO] [CORES] Timer loopback test passed
Using Device: Single USRP:
Device: B-Series Device
Mboard 0: B205mini
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: FE-RX1
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: FE-TX1
Setting RX Rate: 1.000000 Msps...
[INFO] [B200] Asking for clock rate 32.000000 MHz...
[INFO] [B200] Actually got clock rate 32.000000 MHz.
[INFO] [CORES] Performing timer loopback test...
[INFO] [CORES] Timer loopback test passed
Actual RX Rate: 1.000000 Msps...
Setting RX Freq: 0.000000 MHz...
Actual RX Freq: 34.000000 MHz...
Waiting for "lo_locked": +++++++++ locked.
Press Ctrl + C to stop streaming...
^C
Done!
On Mon, Aug 20, 2018 at 1:11 PM Marcus D. Leech via USRP-users
<[email protected] <mailto:[email protected]>> wrote:
On 08/20/2018 03:02 PM, Nicole Bienert via USRP-users wrote:
> Hello!
>
> I am trying to reach the 56MHz BW limit for the USRP B200mini, but
> have only been able to receive 1MHz continuously. Could someone
help
> me reach a higher BW?
>
> I am using the example code rx_samples_to_file.cpp which comes with
> uhd and can be found here:
>
https://github.com/manuts/uhd-examples/blob/master/rx_samples_to_file.cpp
> . I only set the rate, bw (=rate), freq, ant, type, and gain
using the
> options when running the example code. Using the USRP B200mini,
I get
> an overflow error if the rate is higher than 1MHz (type=float). A
> friend lent me their USRP E312, and with that I get an overflow
error
> if the rate is higher than 7.68MHz (type = float). I have
checked the
> number of samples in a file with MATLAB and confirmed that I am
> dropping samples above those rates. I am using a linux, Ubuntu
virtual
> machine which I allocate 10GB of ram (out of 16- I've tried
different
> settings), and am connected to the SDR with USB 3.0.
>
> Any help would be greatly appreciated. Thanks for reading this!
> Nicole
>
What happens if you use the "--null" option, which "goes through the
motions", but doesn't write any file data to the filesystem?
I'll note that performance of USB within a VM tends to very poor.
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