Hello everyone,
A while ago I came across an issue in
running GNURadio with my version of UHD and I have followed
instructions from the Ettus website
https://kb.ettus.com/Building_and_Installing_the_USRP_Open-Source_Toolchain_(UHD_and_GNU_Radio)_on_Linux
Now the UHD version is
UHD_3.11.0.HEAD-0-ga1b5c4ae, and the Gnuradio is version
3.7.13.4, and everything runs fine.
Everything was done on a fresh installation
of Ubuntu 18.04.1 LTS.
Now, I want to do synchronous recording of
all 4 channels on one X310 SDR chassis, but when I check the
phase of the signal at each channel, they are not in phase.
Initially, I thought that it should have
something to do with the internal LO, so I tried various
combinations of the LO configuration:
1.
Internal, companion, companion,
companion
2.
Internal, companion, external,
external
3.
Internal, companion, external,
companion
4.
all internal
But, it still does not work. I have
connected the LO RF cables in a criss-cross fashion inside the
chassis as well to pass the LO configuration to the
neighbouring 2 channels.
Attached here is a snapshot of the GNURadio
flowchart I designed for that purpose.
I also tried to install the latest UHD
version in my computer, but it is unable to work with FPGA
image (non-release version). Because the X310 are not mine, I
cannot update FPGA image.
Have you all come across this issue before?
Please share your views on this, any help is much appreciated!
I have tried installing and reinstalling the programs a few
times, but the conclusion is still the same, and the phases
across the channels do not match.
Thanks and regards,
YJ