I’m using LimeSuite 17.10.0-PothosSDR-2017.11.26-vc14-x64, and the latest (4 DEC release) firmware and FPGA gateware. I am having an issue getting phase shift corrections to “stick” on my LimeSDR USB HW 1.4, I can make some changes and then click GUI->Chip and then when I release the board from LimeSuite and start GNURadio I still see a significant phase shift between the two RX signals for a 0 degree input difference.
I’m running a signal source into a Mini-Circuits ZN4PD1-63HP 4 way 0-degree hybrid, with two equal lengths of transmission line (matched, from Mini-Circuits) into the RX ports of the LimeSDR. The other two ports on the hybrid are terminated with Z50 SMA terminators.
Can someone walk me through how phase corrections for the RX’s are supposed to be applied from LimeSuite? I’m assuming that it’s the following, please let me know where I go wrong:
Connect to LimeSDR
Make changes in the GUI
Disconnect from LimeSDR
Start GNURadio and test.
However when I read Chip-> GUI I don’t seem to see the changes I made. It seems to have some values in that I didn’t place. Please advise me where I’ve gone wrong.