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From: | Zhan Yanjun |
Subject: | [Discuss-gnuradio] Phase Synchronization Across Channels in X310 |
Date: | Fri, 17 Aug 2018 09:37:41 +0000 |
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 |
Screenshot from 2018-08-17 16-41-03.png
Description: Screenshot from 2018-08-17 16-41-03.png
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