Well, after some research, I saw that Amarisoft works with lower bandwidths (up to 30 MHz). It seems to me that the problem is with the sample rate settings (perhaps Amarisoft is setting a higher sample rate than is possible for XTRX Rev 5, I’ll investigate this further). Thanks again for the help @ricardas!
The amarisoft plugin is setting sample rate higher than the requested bandwidth: LimeSuiteNG/plugins/amarisoft-plugin/trx_limesuite.cpp at 23b0a90970c0be9b60e8eb5d2136ff3db52eda23 · myriadrf/LimeSuiteNG · GitHub
I’m not sure about the Rev.5 gateware capabilities, but for LimeSDR XTRX to use sampling rates higher than 61.44MHz it has to be configured into SISO mode.
XTRX Rev. 5 gateware has been updated, to fix the sampling rate issues and add 64bit dma support. LimeSDR-XTRX_GW/bitstream/flash_programming_file.bin at LimeSDR-XTRX_fairwaves_rev5 · myriadrf/LimeSDR-XTRX_GW · GitHub Make sure that you take gateware from the right branch.