On 11/06/2018 04:12 AM, Gwenhael Goavec-Merou via USRP-users wrote:
Hi,
My environment is:
USRP: X310 with basicRX (currently one but 6 in a near future)
UHD: 3.13.1.0-rc1
GNURadio: 3.7.13.4-r2
gr-ettus: master branch, up to date
I need to sample 4 real signal / USRP and to demodulate / decimate before
transfer to the PC.
I have created a GNURadio flow with:
- 2 Radio (id 0 and 1), configured with 2 channels
- 2 DDC (id 0 and 1), with 2 channels, with a center frequency fixed to XX MHz
- 4 complex To Real;
- 1 QT Gui with 4 inputs.
Each channel of each radio is connected to an DDC input (radio0 channel 0 to
DDC0 input 0, radio0 channel 1 to DDC0 input 1, etc.)
With this setup and with an input configured as XX + YY MHz (to have a
beatnote) I'm able to see a sinusoid on the qt for all channels (if I plug /
unplug an input signal the corresponding plot is equal to 0 or displays the
signal).
But:
1/ the console panel display continuouly messages about channels overrun
2/ the data flow is not continuous (visible in qt plot) (I suppose is due to
1/ )
3/ channels are not aligned (I suppose is due to 1/ and/or 2/
Theorically, by reading HDL files for the X310 firmware it's seems possible to
use this configuration.
Then, how to fix my issue?
- Is it a USRP/UHD limitation?
- gr-ettus seems not heavily upgraded, is something must be modified in this
repository?
- I am just wrong somewhere on my design?
Thank you very much
Gwen
What is the sample rate as delivered to the PC? What kind of PC?
Overrun means that your PC isn't keeping up with the sample flow.
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